#include <c4d_tools.h>

Inheritance diagram for VolumeData:

Public Member Functions
void	CalcArea (const RayLight light, Bool nodiffuse, Bool nospecular, Float specular_exponent, const Vector64 &ray_vector, const Vector64 &p, const Vector64 &bumpn, const Vector64 &orign, RAYBIT raybits, Bool ignoreLightColor, Vector diffuse, Vector *specular)

Vector	CalcShadow (const RayLight *l, const Vector64 &p, const Vector64 &bumpn, const Vector64 &phongn, const Vector64 &orign, const Vector64 &rayv, Bool transparency, const RayHitID &hitid, RAYBIT raybits)

Bool	IlluminateSurfacePoint (const RayLight rl, Vector col, Vector64 *light_vector, const Vector64 &p, const Vector64 &bumpn, const Vector64 &phongn, const Vector64 &orign, const Vector64 &ray_vector, ILLUMINATEFLAGS flags, const RayHitID &hitid, RAYBIT raybits, Bool cosine_cutoff)

Bool	IlluminateAnyPoint (const RayLight rl, Vector col, Vector64 *light_vector, const Vector64 &p, ILLUMINATEFLAGS flags, RAYBIT raybits)

void	IlluminanceSurfacePoint (IlluminanceSurfacePointData f, Vector diffuse, Vector *specular)

Vector	IlluminanceAnyPoint (const Vector64 &p, ILLUMINATEFLAGS flags, RAYBIT raybits)

void	IlluminanceSimple (Vector diffuse, Vector specular, Float exponent, IlluminationModel model, void data)

Int32	GetCurrentCPU () const

Int32	GetCPUCount () const

Int32	Obj_to_Num (const RayObject *obj) const

const RayObject *	GetObj (Int32 index) const

Int32	GetObjCount () const

void	GetUVW (const RayObject op, Int32 uvwind, Int32 local_id, PolyVector uvw) const

void	GetNormals (const RayObject op, Int32 local_id, PolyVector norm) const

TexData *	GetTexData (const RayObject *op, Int32 index) const

Vector64	GetNormal (const RayObject *op, Int32 polygon, Bool second) const

Int32	GetRayPolyState (const RayObject *op, Int32 local_id) const

Int32 *	GetUniqueID (const RayObject *op, Int32 &length) const

Vector64	GetSmoothedNormal (const RayHitID &hitid, const Vector64 &p) const

Bool	GetRS (const RayHitID &hitid, const Vector64 &p, Float r, Float s) const

void	GetWeights (const RayHitID &hitid, const Vector64 &p, RayPolyWeight *wgt) const

const RayLight *	GetLight (Int32 index) const

Int32	GetLightCount () const

Int32	Light_to_Num (const RayLight *light) const

const void *	GetRayData (Int32 i) const

const RayCamera *	GetRayCamera () const

const RayParameter *	GetRayParameter () const

const RayEnvironment *	GetRayEnvironment () const

const RayObject *	GetRaySky () const

const RayObject *	GetRayForeground () const

const RayObject *	GetRayBackground () const

void	GetRay (Float x, Float y, Ray *ray) const

Vector64	ScreenToCamera (const Vector64 &p) const

Vector64	CameraToScreen (const Vector64 &p) const

Vector	CalcHardShadow (const Vector64 &p1, const Vector64 &p2, CALCHARDSHADOW flags, const RayHitID &last_hit, Int32 recursion_id=0, void *recursion_data=nullptr)

Vector	GetPointUVW (const TexData *tdp, const RayHitID &hit, const Vector64 &p) const

Bool	ProjectPoint (const TexData tdp, const RayHitID &hit, const Vector64 &p, const Vector64 &n, Vector uv) const

void	StatusSetText (const maxon::String &str) const

void	StatusSetBar (Float percentage) const

void	StatusSetSpinMode (Bool on) const

Vector	CalcVisibleLight (const Ray ray, Float maxdist, Vector trans) const

void	GetXY (Int32 x, Int32 y, Int32 *scale) const

void	SetXY (Float x, Float y)

MinMax	GetSceneBoundaries () const

void	CopyTo (VolumeData *dst) const

void	Init (VolumeData *from)

void	OutOfMemory ()

Bool	CalcFgBg (Bool foreground, Int32 x, Int32 y, Int32 subx, Int32 suby, Vector color, Float alpha) const

Float	GetLightFalloff (Int32 falloff, Float inner, Float outer, Float dist) const

Bool	TestBreak ()

BaseVideoPost *	GetVideoPost (Int32 nth) const

BaseVideoPost *	FindVideoPost (Int32 id) const

const VPFragment **	GetFragments (Int32 x, Int32 y, Int32 cnt, VPGETFRAGMENTS flags) const

Bool	AddLensGlow (const LensGlowStruct lgs, Vector lgs_pos, Int32 lgs_cnt, Float intensity, Bool linear_workflow) const

Bool	SampleLensFX (const VPBuffer rgba, const VPBuffer fx, BaseThread *bt) const

Int32	TranslateObjIndex (Int32 index, Bool old_to_new) const

Bool	TranslatePolygon (const RayObject op, Int32 local_index, Vector previous_points) const

Vector	TraceColor (Ray ray, Float maxdist, const RayHitID &last_hit, SurfaceIntersection si)

Vector	TraceColorDirect (Ray ray, Float maxdist, Int32 raydepth, RAYBIT raybits, const RayHitID &last_hit, Vector64 oldray, SurfaceIntersection *si)

Bool	TraceGeometry (const Ray ray, Float maxdist, const RayHitID &last_hit, SurfaceIntersection si) const

Bool	TraceGeometryEnhanced (const Ray ray, Float maxdist, const RayHitID &last_hit, Int32 raydepth, RAYBIT raybits, Vector64 oldray, SurfaceIntersection *si) const

void	GetSurfaceData (SurfaceData cd, Bool calc_illum, Bool calc_shadow, Bool calc_refl, Bool calc_trans, Ray ray, const SurfaceIntersection &si)

Vector	CentralDisplacePointUV (const RayObject *op, Int32 local_id, Int32 uu, Int32 vv) const

Vector	CentralDisplacePointFromUVPoint (const RayObject *op, Int32 local_id, Bool bFirst, Float l1, Float l2, const Vector &uv, const UVWStruct &uvw) const

Vector	CalcDisplacementNormals (Float par_u, Float par_v, Int32 u0, Int32 v0, Int32 u1, Int32 v1, Int32 u2, Int32 v2, const Vector &a, const Vector &b, const Vector &c, const RayObject *op, Int32 polynum) const

Vector	CentralDisplaceUVGetNormal (const RayObject *op, Int32 local_id, Int32 uu, Int32 vv) const

Vector	CentralDisplaceGetSurfaceNormalFromUVPoint (const RayObject *op, Int32 local_id, Bool bFirst, Float par_u, Float par_v, const Vector &uv, const UVWStruct &uvw) const

Vector	CentralDisplaceGetShadingNormalFromUVPoint (const RayObject *op, Int32 local_id, Bool bFirst, Float par_u, Float par_v, const Vector &uv, const UVWStruct &uvw) const

Bool	CentralDisplacePointUVGetBarycentric (const RayObject *op, Int32 &local_id, Int32 &uu, Int32 &vv, RayPolyWeight &bary, Bool &displaceQuad) const

Bool	GetDisplaceInfo (const RayObject *op, DisplaceInfo &info) const

Int32	GetDisplaceNeighbor (const RayObject *op, Int32 local_id, Int32 side) const

void	CorrectLocalID (const RayObject *op, Int32 &local_id) const

Vector	CalcBackTransformPoint () const

Matrix64	CalcMotionObjectMatrixInv (const RayObject *op) const

void	SkipRenderProcess ()

const Render *	GetRenderInstance () const

void	GetDUDV (const TexData tex, const Vector64 &p, const Vector64 &phongn, const Vector64 &orign, const RayHitID &hit, Bool forceuvw, Vector ddu, Vector ddv, Bool usetangents, const RayPolyWeight weight) const

void	GetDUDVFromUVPoint (const RayObject op, const TexData tex, Float par_u, Float par_v, const Vector64 &uv, const Vector64 &p, const Vector64 &phongn, const Vector64 &orign, const UVWStruct &uvw, RayHitID &hit, Bool forceuvw, Vector ddu, Vector ddv, Bool usetangents)

void	InitSurfacePointProperties (TexData *td)

Bool	AttachVolumeDataFake (BaseObject *camera, const BaseContainer &renderdata)

Bool	HasVolumeDataFake () const

Bool	SaveShaderStack (RayShaderStackElement *&stack, Int32 &stack_cnt)

Bool	RestoreShaderStack (RayShaderStackElement *stack, Int32 stack_cnt)

const RayObject *	GetRaySky (Int32 index) const

Int32	GetRaySkyCount () const

RaySampler *	GetRaySampler (void *guid, Int32 depth)

Float	GetRayWeight () const

Float	CalcAmbientOcclusion (SurfaceIntersection si, RaySampler sampler, Float minlength, Float maxlength, Float index, Bool self, Bool trans, Float weight, Bool reverse)

Vector	CalcSubsurfaceScattering (Vector scattering, Vector absorption, Vector diffuse, Float ior)

Int32	GetStreamCount () const

void	GetStreamRay (Int32 stream, Float x, Float y, Ray *ray) const

Bool	CalcIndirectIllumination (RayHemisphere *hs, Float weight)

Bool	CalcIndirectPDF (const Vector &point, const Vector &normal, const Vector &ray_in, const Vector &ray_out, Float &pdf_qmc, Float &pdf_area, Float &pdf_portal, Float &pdf_sky)

Bool	CalcIndirectPath (VolumeData sd, const Vector &dir, void source, void *target)

RayRadianceObject *	CreateRadianceMaps ()

RayRadianceObject *	GetRadianceMaps ()

Vector	CalcRadianceValue (Ray *ray, const SurfaceIntersection &si)

Vector	CalcRadiancePoly (RayRadianceObject obj, SurfaceIntersection si, Int32 poly, Int32 u, Int32 v, Bool back)

Bool	IsPhysicalRender () const

Float	GetPhysicalCameraIntensity () const

void	SetPhysicalRayTime (Float time)

const RayMotionObject *	GetMotionObject (RayObject *op)

const RayMotionLight *	GetMotionLight (RayLight *light)

const RayMotionCamera *	GetMotionCamera (Int32 stream)

Bool	GetTile (Int32 &xMin, Int32 &yMin, Int32 &xMax, Int32 &yMax, Int32 &renderThreadIndex) const

Private Member Functions
	VolumeData ()

	~VolumeData ()

Alloc/Free
static VolumeData *	Alloc ()

static void	Free (VolumeData *&vd)

Additional Inherited Members
Public Attributes inherited from BaseVolumeData
Int32	version

Int32	fps

Vector	ambient

Float	time

Vector	col

Vector	trans

Vector	refl

Float	alpha

Ray *	tray

Ray *	rray

Vector64	p

Vector64	bumpn

Ray *	ray

Vector64	orign

Vector64	n

Vector64	dispn

Float64	dist

Float64	cosc

Vector	uvw

Vector	delta

RayHitID	lhit

const TexData *	tex

Vector	ddu

Vector	ddv

Int32	raydepth

Int32	calc_trans

Int32	calc_refl

Bool	calc_shadow

Int32	calc_illum

Int32	calc_mip

Vector	pp [3]

Vector	nn [3]

RAYBIT	raybits

const RayLight *	xlight

const RayObject *	op

Int32	recursion_id

void *	recursion_data

Multipass *	multipass

Vector	back_p

Vector	back_delta

Float	global_mip

Int32	sid

Float	par_u

Float	par_v

SurfaceIntersection *	intersection

Float	mb_offset

Vector	comp_color

Vector	comp_specular

Vector	comp_luminance

TexEntry *	rtex [4]

Int32	rtex_count

Int32	elementIndex

const RayPolyWeight *	displacementWeight

Protected Member Functions inherited from BaseVolumeData
	BaseVolumeData ()

Constructor & Destructor Documentation

◆ VolumeData()

VolumeData ( )

private

◆ ~VolumeData()

~VolumeData ( )

private

Member Function Documentation

◆ Alloc()

static VolumeData* Alloc ( )

static

Allocates a volume data. Destroy the allocated volume data with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Warning: Should normally not be used.

Returns: The allocated volume data, or nullptr if the allocation failed.

◆ Free()

static void Free ( VolumeData *& vd )

static

Destructs volume data allocated with Alloc(). Use AutoAlloc to automate the allocation and destruction based on scope.

Parameters

[in,out] vd The volume data to destruct. If the pointer is nullptr nothing happens. The pointer is assigned nullptr afterwards.

◆ CalcArea()

void CalcArea	(	const RayLight *	light,
		Bool	nodiffuse,
		Bool	nospecular,
		Float	specular_exponent,
		const Vector64 &	ray_vector,
		const Vector64 &	p,
		const Vector64 &	bumpn,
		const Vector64 &	orign,
		RAYBIT	raybits,
		Bool	ignoreLightColor,
		Vector *	diffuse,
		Vector *	specular
	)

If you code custom illumination models (e.g. different specular function) you can do this for standard light sources easily.
For area lights you will usually want to fall back to the default illumination model though, as otherwise you would have to rebuild the sample code of area lights!
Here is an example how to sample area lights using this method:

for (i=sd->GetLightCount()-1; i>=0; i--)
{
    lp = sd->GetLight(i);
    if (!sd->IlluminateSurfacePoint(lp,&col,&lv,sd->p,sd->bumpn,sd->n,sd->orign,SV(sd->ray->v),sd->calc_shadow,sd->lhit,sd->raybits,true))
      continue;
    if (lp->ambient)
    {
      *diffuse += col;
      continue;
    }
 
    nodif = nospec = false;
    if (lp->lr.object)
      CalcRestrictionInc(&lp->lr,sd->op,nodif,nospec);
 
    if (lp->type==RT_LT_AREA)
    {
      Vector dif,spc;
      sd->CalcArea(lp,nodif,nospec,exponent,SV(sd->ray->v),sd->p,sd->bumpn,sd->orign,sd->raybits,&dif,&spc);
 
      *diffuse  += dif^col;
      *specular += spc^col;
    }
    else
    {
      cosa=lv*sd->bumpn;
      if (!(lp->nodiffuse || nodif) && sd->cosc*cosa>=0.0)
      {
        if (lp->contrast!=0.0)
          *diffuse += Pow(Abs(cosa),Exp(-lp->contrast))*col;
        else
          *diffuse += Abs(cosa)*col;
    }
 
    if (calc_specular && !(lp->nospecular || nospec))
    {
      cosb=SV(sd->ray->v) * (lv - sd->bumpn*(2.0 * cosa));
      if (cosb<=0.0) continue;
 
      *specular += Pow(cosb,exponent)*col;
    }
    }
  }
 
  diffuse.ClampMin(); // there can be subtractive light sources
  specular.ClampMin();
}

Parameters

[in]	light	The area light to calculate.
[in]	nodiffuse	true if the diffuse value should not be calculated, otherwise false.
[in]	nospecular	true if the specular value should not be calculated, otherwise false.
[in]	specular_exponent	The specular exponent to use.
[in]	ray_vector	The ray vector.
[in]	p	The surface point.
[in]	bumpn	The bump normal.
[in]	orign	The original normal.
[in]	raybits	The ray bits: RAYBIT
[in]	ignoreLightColor	Whether to factor the light color into the result
[out]	diffuse	Assigned the diffuse component.
[out]	specular	Assigned the specular component.

◆ CalcShadow()

Vector CalcShadow	(	const RayLight *	l,
		const Vector64 &	p,
		const Vector64 &	bumpn,
		const Vector64 &	phongn,
		const Vector64 &	orign,
		const Vector64 &	rayv,
		Bool	transparency,
		const RayHitID &	hitid,
		RAYBIT	raybits
	)

Computes a shadow.

Parameters

[in]	l	The illuminating light source. The caller owns the pointed light.
[in]	p	The point in global coordinates.
[in]	bumpn	The bump normal.
[in]	phongn	The phong normal.
[in]	orign	The original normal.
[in]	rayv	The ray vector.
[in]	transparency	true if transparencies/alphas for in between objects should be evaluated.
[in]	hitid	The global RayHitID structure for the surface intersection (to avoid self shadowing). Pass RayHitID() if not on a surface or to not use of this avoidance.
[in]	raybits	The ray bits: RAYBIT

Returns: The shadow value. If there is no shadow, 0.0 will be returned. 1.0 is the maximum shadow value for each component.

◆ IlluminateSurfacePoint()

Bool IlluminateSurfacePoint	(	const RayLight *	rl,
		Vector *	col,
		Vector64 *	light_vector,
		const Vector64 &	p,
		const Vector64 &	bumpn,
		const Vector64 &	phongn,
		const Vector64 &	orign,
		const Vector64 &	ray_vector,
		ILLUMINATEFLAGS	flags,
		const RayHitID &	hitid,
		RAYBIT	raybits,
		Bool	cosine_cutoff
	)

Calculates the intensity of incoming light for a given light and surface point. Used for custom illumination models.

Parameters

[in]	rl	The illuminating light. The caller owns the pointed light.
[out]	col	Assigned the result of the calculation.
[out]	light_vector	Assigned the light to point vector. For area and tube lights the vector will use the center of the light source.
[in]	p	The surface point.
[in]	bumpn	The bump normal.
[in]	phongn	The phong normal.
[in]	orign	The original normal.
[in]	ray_vector	The ray vector.
[in]	flags	The illuminate flags: ILLUMINATEFLAGS
[in]	hitid	The global RayHitID structure for the surface intersection (to avoid self shadowing). Can be set to RayHitID() if you do not have the current RayHitID.
[in]	raybits	The ray bits: RAYBIT
[in]	cosine_cutoff	true if cosine cut-off should be used, otherwise false.

Returns: true if the light illuminates the objects surface point, otherwise false.

◆ IlluminateAnyPoint()

Bool IlluminateAnyPoint	(	const RayLight *	rl,
		Vector *	col,
		Vector64 *	light_vector,
		const Vector64 &	p,
		ILLUMINATEFLAGS	flags,
		RAYBIT	raybits
	)

Calculates the intensity of incoming light for a given light and arbitrary point. Used for custom illumination models.

Parameters

[in]	rl	The illuminating light. The caller owns the pointed light.
[out]	col	Assigned the result of the calculation.
[out]	light_vector	Assigned the light to point vector. For area and tube lights the vector will use the center of the light source.
[in]	p	The surface point.
[in]	flags	The illuminate flags: ILLUMINATEFLAGS
[in]	raybits	The ray bits: RAYBIT

Returns: true if the light illuminates the point, otherwise false.

◆ IlluminanceSurfacePoint()

void IlluminanceSurfacePoint	(	IlluminanceSurfacePointData *	f,
		Vector *	diffuse,
		Vector *	specular
	)

Calculates the diffuse and specular components for a given point.
This function can calculate the illumination for any point in space and is widely used for volumetric shaders that display a surface structure (e.g. Cinema 4D's terrain shader).

Parameters

[in]	f	The surface point data used for the call. The caller owns the pointed data.
[in]	diffuse	Assigned the diffuse component.
[in]	specular	Assigned the specular component.

◆ IlluminanceAnyPoint()

Vector IlluminanceAnyPoint	(	const Vector64 &	p,
		ILLUMINATEFLAGS	flags,
		RAYBIT	raybits
	)

Calculates the light intensity for a given point p.
This function can calculate the illumination for any point in space and is widely used for transparent volumetric shaders (gases, clouds etc.).

Parameters

[in]	p	The global coordinate point to calculate the illumination for.
[in]	flags	The illuminate flags: ILLUMINATEFLAGS
[in]	raybits	The ray bits: RAYBIT

Returns: The calculated color. Note its components can exceed values of 1.0!

◆ IlluminanceSimple()

void IlluminanceSimple	(	Vector *	diffuse,
		Vector *	specular,
		Float	exponent,
		IlluminationModel *	model,
		void *	data
	)

Calculates the diffuse and specular components according to the current VolumeData and a given specular exponent, or optionally using a custom illumination model.

Parameters

[out]	diffuse	Assigned the diffuse component.
[out]	specular	Assigned the specular component.
[in]	exponent	The exponent to calculate the specular component. If exponent==0.0 then no specular is calculated, otherwise a specular is calculated with exponent as exponent value for the phong formula.
[in]	model	A custom illumination model, or nullptr to use the default illumination model. The caller owns the pointed illumination model.
[in]	data	The private data passed to the custom illumination function. The caller owns the pointed data.

◆ GetCurrentCPU()

Int32 GetCurrentCPU ( ) const

Retrieves the current thread index on which the shader is executed.

Returns: The running thread index, which is guaranteed to be >= 0 and smaller than GetCPUCount().

◆ GetCPUCount()

Int32 GetCPUCount ( ) const

Retrieves the thread count the renderer is utilizing. The value returned here can differ from or exceed the global GeGetCurrentThreadCount() as the renderer can utilize any different number of threads.

Returns: The number of utilized threads (>=1).

◆ Obj_to_Num()

Int32 Obj_to_Num ( const RayObject * obj ) const

Retrieves an object's number. Opposite of GetObj().

Parameters

[in] obj The object to get the number for. The caller owns the pointed object.

Returns: The object's number.

◆ GetObj()

const RayObject* GetObj ( Int32 index ) const

Retrieves the object at index.

Parameters

[in] index The object index: 0<= index < GetObjCount()

Returns: The object. The volume data owns the pointed object.

◆ GetObjCount()

Int32 GetObjCount ( ) const

Retrieves the overall number of objects.

Returns: The total number of objects.

◆ GetUVW()

void GetUVW	(	const RayObject *	op,
		Int32	uvwind,
		Int32	local_id,
		PolyVector *	uvw
	)		const

Retrieves the UVW coordinates information for a polygon.

Note: If the polygon consists of three points (triangle) the fourth UVW coordinate 'd' may be uninitialized.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	uvwind	The UVW number (there may be several UVW coordinate sets): 1 <= uvwind < op->uvwcnt
[in]	local_id	The local polygon ID: 0 <= local_id < op->vcnt
[out]	uvw	Assigned the UVW coordinates. The caller owns the pointed coordinates.

◆ GetNormals()

void GetNormals	(	const RayObject *	op,
		Int32	local_id,
		PolyVector *	norm
	)		const

Retrieves the phong normals for a polygon.

Note: If the polygon consists of three points (triangle) the fourth normal d may be uninitialized.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	local_id	The local polygon ID: 0 <= local_id < op->vcnt
[out]	norm	Assigned the phong normals. The caller owns the pointed coordinates.

◆ GetTexData()

TexData* GetTexData	(	const RayObject *	op,
		Int32	index
	)		const

Retrieves the texture at index of an object.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	index	The index of the texture: 0 <= index < op->texcnt

Returns: The texture. The volume data owns the pointed texture.

◆ GetNormal()

Vector64 GetNormal	(	const RayObject *	op,
		Int32	polygon,
		Bool	second
	)		const

Retrieves the face normal for a polygon.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	polygon	The local polygon ID: 0 <= local_id < op->vcnt
[in]	second	true if this is the second part of a quadrangle (A-C-D), otherwise false.

Returns: The face normal.

◆ GetRayPolyState()

Int32 GetRayPolyState	(	const RayObject *	op,
		Int32	local_id
	)		const

Gets the polygon state of the polygon with ID local_id of object op.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	local_id	The local polygon ID: 0 <= local_id < op->vcnt

Returns: The polygon state: RayTracePolystate

◆ GetUniqueID()

Int32* GetUniqueID	(	const RayObject *	op,
		Int32 &	length
	)		const

Retrieves the unique object IP address.

Note: The ID is somewhat constant across frames so it is handy to identify objects in animation.

Parameters

[in]	op	The object. The caller owns the pointed object.
[in]	length	Assigned the length.

Returns: The pointer to the address of the unique ID. Cinema 4D owns the pointed ID.

◆ GetSmoothedNormal()

Vector64 GetSmoothedNormal	(	const RayHitID &	hitid,
		const Vector64 &	p
	)		const

Retrieves the phong normal for a point.

Parameters

[in]	hitid	The global RayHitID.
[in]	p	The point for the phong normal. Must be within the surface boundaries of the polygon.

Returns: The phong normal.

◆ GetRS()

Bool GetRS	(	const RayHitID &	hitid,
		const Vector64 &	p,
		Float *	r,
		Float *	s
	)		const

Calculates the R/S parameters for a point.
To calculate the weighted data (e.g. based upon a color for each polygon point) do it the following way:

Float r,s;
Bool snd = sd->GetRS(hitid,p,&r,&s);
 
if (snd)
  result = [color a] * (1.0-r-s) + [color d]*r + [color c]*s
else
  result = [color a] * (1.0-r-s) + [color b]*r + [color c]*s

Parameters

[in]	hitid	The global RayHitID.
[in]	p	The point.
[out]	r	Assigned the R parameter.
[out]	s	Assigned the S parameter.

Returns: true if the polygon is a quadrangle for the second part (a-c-d) of the quadrangle or false for the first part (a-b-c).
If the polygon is a triangle then this is the same as the first part of a quadrangle (a-b-c).

◆ GetWeights()

void GetWeights	(	const RayHitID &	hitid,
		const Vector64 &	p,
		RayPolyWeight *	wgt
	)		const

Calculates the barycentric coordinates for a point on the surface of a polygon.
Cinema 4D uses enhanced interpolation routines for quadrangles, so you will get a higher quality using it instead of considering a quadrangle as two triangles.
The routine works for any type of polygon, including triangles and non-coplanar quadrangles.

The function fills the wgt structure with the weight factors for the global polygon with ID hitid at point p on polygon.
Works similar to GetRS(), but has a higher quality. Here is an example:

cd->vd->GetWeights(cd->vd->lhit, vSurfIntersect, &weight);
Float rWeightA, rWeightB, rWeightC, rWeightD;
Int32 lIndexA = pRayObject->vadr[lPolygonIndex].a;
Int32 lIndexB = pRayObject->vadr[lPolygonIndex].b;
Int32 lIndexC = pRayObject->vadr[lPolygonIndex].c;
Int32 lIndexD = pRayObject->vadr[lPolygonIndex].d;
rWeightA = prVertexMapData[lIndexA];
rWeightB = prVertexMapData[lIndexB];
rWeightC = prVertexMapData[lIndexC];
rWeightD = prVertexMapData[lIndexD];
rFunctionSample = weight.wa * rWeightA + weight.wb * rWeightB + weight.wc * rWeightC + weight.wd * rWeightD;

Parameters

[in]	hitid	The global RayHitID.
[in]	p	The point on polygon.
[out]	wgt	Filled with the weight factors. The caller owns the pointed weights.

◆ GetLight()

const RayLight* GetLight ( Int32 index ) const

Get the light source at index.

Parameters

[in] index The index of the light source to return: 0 <= index < GetLightCount()

Returns: The light source. The volume data owns the pointed light.

◆ GetLightCount()

Int32 GetLightCount ( ) const

Gets the overall number of lights.

Returns: The number of lights.

◆ Light_to_Num()

Int32 Light_to_Num ( const RayLight * light ) const

Gets the number for a light. Opposite of GetLight().

Parameters

[in] light The light to get the number for. The caller owns the pointed light.

Returns: The light's number.

◆ GetRayData()

const void* GetRayData ( Int32 i ) const

Retrieves one of the raytracer structures, these are also available as direct called, for example GetRaySky().

Parameters

[in] i The requested structure type: RAY

Returns: The requested raytracer structure. The volume data owns the pointed structure.

◆ GetRayCamera()

const RayCamera* GetRayCamera ( ) const

Retrieves the raytracer camera.

Returns: The camera. The volume data owns the pointed camera.

◆ GetRayParameter()

const RayParameter* GetRayParameter ( ) const

Retrieves the raytracer parameters (settings).

Note: The raytracer uses a completely different representation than the normal scene (BaseDocument).
It has new, efficient data structures where you do not need to check a lot of things. As you do not have a BaseDocument (it is still there for special purposes, but normally you will not have to deal with it in the raytracer) all relevant data structures can be obtained through VolumeData.

Returns: The raytracer parameters. Guaranteed to be valid (not nullptr). The volume data owns the pointed parameters.

◆ GetRayEnvironment()

const RayEnvironment* GetRayEnvironment ( ) const

Retrieves the raytracer environment parameters.

Returns: The raytracer environment. Guaranteed to be valid (not nullptr). The volume data owns the pointed parameters.

◆ GetRaySky() [1/2]

const RayObject* GetRaySky ( ) const

Retrieves the sky object.

Returns: The sky object, or nullptr if none is there. The volume data owns the pointed sky object.

◆ GetRayForeground()

const RayObject* GetRayForeground ( ) const

Retrieves the foreground object.

Returns: The foreground object, or nullptr if none is there. The volume data owns the pointed foreground object.

◆ GetRayBackground()

const RayObject* GetRayBackground ( ) const

Retrieves the background object.

Returns: The background object, or nullptr if none is there. The volume data owns the pointed background object.

◆ GetRay()

void GetRay	(	Float	x,
		Float	y,
		Ray *	ray
	)		const

Generates the view ray for a position.
Does not set Ray::pp[0..2], Ray::vv[0..2], Ray::transport and Ray::ior. Those have to be filled in if used subsequently by TraceColor(), TraceColorDirect() or GetSurfaceData().
It is not necessary for TraceGeometry() though (as there are no MIP mapping calculations).

ray.ior=1.0;
ray.transport=1.0;
ray.pp[0]=ray.pp[1]=ray.pp[2]=SV(ray.p);
ray.vv[0]=ray.vv[1]=ray.vv[2]=SV(ray.v);

Parameters

[in]	x	The X position for the view ray in screen space coordinates.
[in]	y	The Y position for the view ray in screen space coordinates.
[out]	ray	Assigned the generated view ray. The caller owns the pointed ray.

◆ ScreenToCamera()

Vector64 ScreenToCamera ( const Vector64 & p ) const

Transforms screen to camera coordinates.

Note: During QTVR rendering same point is returned.

Parameters

[in] p The screen coordinate.

Returns: The camera coordinate.

◆ CameraToScreen()

Vector64 CameraToScreen ( const Vector64 & p ) const

Transforms camera to screen coordinates.

Note: During QTVR rendering same point is returned.

Parameters

[in] p The camera coordinate.

Returns: The screen coordinate.

◆ CalcHardShadow()

Vector CalcHardShadow	(	const Vector64 &	p1,
		const Vector64 &	p2,
		CALCHARDSHADOW	flags,
		const RayHitID &	last_hit,
		Int32	recursion_id = `0`,
		void *	recursion_data = `nullptr`
	)

Calculates a hard shadow from point p1 to p2.

Note: Set the CALCHARDSHADOW::TRANSPARENCY flag if transparencies/alphas for in between objects shall be evaluated.
An additional last_hit can be passed to avoid self-shadowing (if starting on a surface). To not make use of it just pass 0.

Parameters

[in]	p1	The start point for the hard shadow.
[in]	p2	The end point for the hard shadow.
[in]	flags	The flags: CALCHARDSHADOW
[in]	last_hit	The last intersection. Pass RayHitID() to include all polygons.
[in]	recursion_id	A plugin ID for data passed through recursion.
[in]	recursion_data	The data that can be passed through recursion.

Returns: The shadow value. 0.0 if there is no shadow. 1.0 is the maximum shadow value for each component.

◆ GetPointUVW()

Vector GetPointUVW	(	const TexData *	tdp,
		const RayHitID &	hit,
		const Vector64 &	p
	)		const

Computes the UVW coordinates for a texture.

Parameters

[in]	tdp	The texture for the coordinate. The caller owns the pointed texture.
[in]	hit	The global RayHitID.
[in]	p	The point for the UVW coordinate.

Returns: The UVW coordinate.

◆ ProjectPoint()

Bool ProjectPoint	(	const TexData *	tdp,
		const RayHitID &	hit,
		const Vector64 &	p,
		const Vector64 &	n,
		Vector *	uv
	)		const

Computes the UVW coordinates for a texture.

Parameters

[in]	tdp	The texture for the coordinates. The caller owns the pointed texture.
[in]	hit	The global RayHitID.
[in]	p	The point for the UVW coordinate.
[in]	n	The normal for the UVW coordinate.
[out]	uv	Assigned the UVW coordinate.

Returns: true if successful, otherwise false.

◆ StatusSetText()

void StatusSetText ( const maxon::String & str ) const

Set the status bar text during initialization of a shader or videopost effect. If String() is passed the status bar will be cleared.

Parameters

[in] str The status text to display.

◆ StatusSetBar()

void StatusSetBar ( Float percentage ) const

Sets the status bar progress during initialization a your shader or videopost effect.

Parameters

[in] percentage The percentage for the bar.

◆ StatusSetSpinMode()

void StatusSetSpinMode ( Bool on ) const

Sets the render progress bar spinning. Use this to indicate that a plugin is still processing even if the progress bar is not increasing.

Parameters

[in] on true to set the progress bar spinning, false to stop it.

◆ CalcVisibleLight()

Vector CalcVisibleLight	(	const Ray *	ray,
		Float	maxdist,
		Vector *	trans
	)		const

Calculates the mixed color of all visible lights on a given ray span.

Parameters

[in]	ray	The ray span. The caller owns the pointed ray.
[in]	maxdist	The maximum distance for the lights.
[out]	trans	Assigned a value `!=0` if some light sources have a dust effect.

Returns: The mixed color of the lights.

◆ GetXY()

void GetXY	(	Int32 *	x,
		Int32 *	y,
		Int32 *	scale
	)		const

Retrieves the current X/Y pixel position in render resolution. Render resolution is the screen resolution multiplied by scale.

Note: Float(x)/Float(scale) and Float(y)/Float(scale) is the screen position.

Parameters

[out]	x	Assigned the X pixel position.
[out]	y	Assigned the Y pixel position.
[out]	scale	Assigned the render scale.

◆ SetXY()

void SetXY	(	Float	x,
		Float	y
	)

Sets the current X/Y pixel position in render resolution. Render resolution is the screen resolution multiplied by scale.

Note: Float(x)/Float(scale) and Float(y)/Float(scale) is the screen position.
Certain Shaders use the screen pixel position. Plugins (like the Baker for instance) can change this position without having to render an image.

Parameters

[in]	x	The X pixel position to set.
[in]	y	The Y pixel position to set.

◆ GetSceneBoundaries()

MinMax GetSceneBoundaries ( ) const

Goes through all objects and calculates the scene boundaries. It does not take into account infinite sky/floor objects.

Returns: The boundary for all objects within the scene.

◆ CopyTo()

void CopyTo ( VolumeData * dst ) const

Copies the volume data to another VolumeData.

Parameters

[out] dst The destination VolumeData. The caller owns the pointed volume data.

◆ Init()

void Init ( VolumeData * from )

Initializes the VolumeData with the data of the from object.
Only the most essential parts are copied over, including the render instance.
Such a VolumeData can be used for TraceColorDirect(), TraceGeometry(), TraceColor() etc.

Note: Init() is faster than CopyTo(), but does not allow subsequent access of functions like BaseMaterial::CalcSurface() (only possible if all members are initialized by hand).

Parameters

[in] from The source volume data. The caller owns the pointed volume data.

◆ OutOfMemory()

void OutOfMemory ( )

Notify Cinema 4D that a (severe) out-of-memory condition occurred.
Cinema 4D will stop as soon as possible, but there is no guarantee when exactly. It is possible that the shader could still be called several times, so it has to be programmed to handle this and to be crash-proof.

◆ CalcFgBg()

Bool CalcFgBg	(	Bool	foreground,
		Int32	x,
		Int32	y,
		Int32	subx,
		Int32	suby,
		Vector *	color,
		Float *	alpha
	)		const

Calculates the foreground or background color and alpha at (x,y).

Parameters

[in]	foreground	true to calculate the foreground color, otherwise the background color.
[in]	x	The X coordinate.
[in]	y	The Y coordinate.
[in]	subx	The sub-pixel X position: 0 <= subx <= 15
[in]	suby	The sub-pixel Y position: 0 <= suby <= 15
[out]	color	Assigned the background/foreground color.
[out]	alpha	Assigned the background/foreground alpha.

Returns: true if successful, otherwise false.

◆ GetLightFalloff()

Float GetLightFalloff	(	Int32	falloff,
		Float	inner,
		Float	outer,
		Float	dist
	)		const

Calculates the light falloff function (light intensity for a distance).

Parameters

[in]	falloff	The light falloff type: RaytraceLightFalloff
[in]	inner	The inner falloff value.
[in]	outer	The outer falloff value.
[in]	dist	The distance for the intensity to be calculated at.

Returns: The light falloff.

◆ TestBreak()

Bool TestBreak ( )

Tests for termination. If time intensive operations are performed (such as sending out several rays into the scene) call this routine to check for a renderer break.
In normal situations Cinema 4D breaks after a pixel has been calculated.

Returns: true if the operation has been terminated, otherwise false.

◆ GetVideoPost()

BaseVideoPost* GetVideoPost ( Int32 nth ) const

Retrieves a videopost effect for the current render process by index.

Parameters

[in] nth The index of the videopost effect.

Returns: The video post, or nullptr if the index is too large.

◆ FindVideoPost()

BaseVideoPost* FindVideoPost ( Int32 id ) const

Retrieves a video post effect for the current render process by ID.

Parameters

[in] id The video post effect ID.

Returns: The video post, or nullptr if the index is too large.

◆ GetFragments()

const VPFragment** GetFragments	(	Int32	x,
		Int32	y,
		Int32	cnt,
		VPGETFRAGMENTS	flags
	)		const

Retrieves the videopost fragments for a point.

Note: Not all fragments are stored during rendering, just the ones closest to the camera. So this cannot be used to for example draw inside a transparent object.

Warning: The array needs to be freed with DeleteMem() afterwards. The fragments must not be freed!

Parameters

[in]	x	The X coordinate.
[in]	y	The Y coordinate.
[in]	cnt	The X pixel count.
[in]	flags	The flags: VPGETFRAGMENTS

Returns: An array of pointers to the videopost fragments. The caller owns the pointed array. The volume data owns the pointed fragments.

◆ AddLensGlow()

Bool AddLensGlow	(	const LensGlowStruct *	lgs,
		Vector *	lgs_pos,
		Int32	lgs_cnt,
		Float	intensity,
		Bool	linear_workflow
	)		const

Adds a number of lens glows to the image.
In earlier versions the SampleLensFX() call was done automatically. Now this has to be called manually at the end to provide Cinema 4D with the information where to sample.

Parameters

[in]	lgs	An array of lgs_cnt lens glow structs to draw. The caller owns the pointed array.
[in]	lgs_pos	An array of lgs_cnt vectors with the corresponding positions of each lens glow in lgs. The caller owns the pointed array.
[in]	lgs_cnt	The number of elements in the lgs and lgs_pos arrays.
[in]	intensity	The intensity of the lens glows.
[in]	linear_workflow	true if linear workflow is used, otherwise false.

Returns: true if the lens glow was added, otherwise false.

◆ SampleLensFX()

Bool SampleLensFX	(	const VPBuffer *	rgba,
		const VPBuffer *	fx,
		BaseThread *	bt
	)		const

Samples all lens effects previously created by calling AddLensGlow().

Parameters

[in]	rgba	The image buffer. The caller owns the pointed buffer.
[in]	fx	An FX buffer for the new post effect multipass feature, or nullptr. The caller owns the pointed buffer.
[in]	bt	The current thread, or nullptr for the main Cinema 4D thread.

Returns: true if successful, otherwise false.

◆ TranslateObjIndex()

Int32 TranslateObjIndex	(	Int32	index,
		Bool	old_to_new
	)		const

Translates a current RayObject number to the one used in the last frame's rendering or vice versa.
For instance if object 5 was object 10 in the last frame. Then TranslateObjIndex(5, false) = 10 and TranslateObjIndex(10, true) = 5.

Note: If plugin generator objects are involved it is necessary that they support the BaseObject::SetUniqueIP() feature.

Parameters

[in]	index	The object index to convert.
[in]	old_to_new	If true then index is an index from the last frame and the return value is an index in the current frame. Otherwise it is the other way around.

Returns: The converted object index, or NOTOK if the object does not exist anymore (or did not exist before).

◆ TranslatePolygon()

Bool TranslatePolygon	(	const RayObject *	op,
		Int32	local_index,
		Vector *	previous_points
	)		const

For a given RayObject op and a local polygon ID local_index retrieves the array of points from the last frame.

Note: To enable this functionality VIDEOPOSTINFO::REQUEST_MOTIONGEOMETRY must be set in the video post.
This function only makes sense to activate in a videopost plugin, as it goes beyond a single frame.

Parameters

[in]	op	A ray object from the current frame. The caller owns the pointed object.
[in]	local_index	A local polygon ID from the current frame.
[in,out]	previous_points	Should point to an array of 4 Vector elements. The caller owns the pointed array. Assigned the points of the specified polygon from the last frame, if it existed. For a triangle only the 3 first fields of the array are filled.

Returns: true the data was available and stored in previous_points, otherwise false.

◆ TraceColor()

Vector TraceColor	(	Ray *	ray,
		Float	maxdist,
		const RayHitID &	last_hit,
		SurfaceIntersection *	si
	)

Works like TraceGeometry(), but calculates the color for a given ray and evaluates all shaders for the intersection point.

Note: To avoid self-intersection, pass the current hit as last_hit. To include all polygons, set last_hit to RayHitID().

Warning: Always use a limit for the recursion (typically a value from 6 to 20) to avoid the danger of a stack overflow.

Parameters

[in]	ray	The ray to find the intersection for. The caller owns the pointed ray.
[in]	maxdist	The maximum distance to check for intersections.
[in]	last_hit	The last intersection, or RayHitID() to include all polygons.
[out]	si	The surface intersection structure to take the calculated hit data. The caller owns the pointed surface intersection.

Returns: The color.
A color can be returned even if there was no intersection (si.gid==0); in this case the ray intersected the sky.

◆ TraceColorDirect()

Vector TraceColorDirect	(	Ray *	ray,
		Float	maxdist,
		Int32	raydepth,
		RAYBIT	raybits,
		const RayHitID &	last_hit,
		Vector64 *	oldray,
		SurfaceIntersection *	si
	)

Works like TraceColor(), but always samples the full color including all effects.

Note: To avoid self-intersection, pass the current hit as last_hit. To include all polygons, set last_hit to RayHitID().

Warning: A shader must not call this function if RAYBIT::GI is set in raybits.

Parameters

[in]	ray	The ray to find the intersection for. The caller owns the pointed ray.
[in]	maxdist	The maximum distance to check for intersections.
[in]	raydepth	The ray depth.
[in]	raybits	The ray flags: RAYBIT
[in]	last_hit	The last intersection. Pass RayHitID() to include all polygons.
[in]	oldray	Should be set to nullptr.
[out]	si	The surface intersection structure to take the calculated hit data. The caller owns the pointed surface intersection.

Returns: The color.

◆ TraceGeometry()

Bool TraceGeometry	(	const Ray *	ray,
		Float	maxdist,
		const RayHitID &	last_hit,
		SurfaceIntersection *	si
	)		const

Calculates an intersection for ray.

Note: To avoid self-intersection, pass the current hit as last_hit. To include all polygons, set last_hit to RayHitID().

Parameters

[in]	ray	The ray to find the intersection for. The caller owns the pointed ray.
[in]	maxdist	The maximum distance to check for intersections.
[in]	last_hit	The last intersection. Pass RayHitID() to include all polygons.
[out]	si	The surface intersection structure to take the calculated hit data. The caller owns the pointed surface intersection.

Returns: true if an intersection was found, otherwise false.

◆ TraceGeometryEnhanced()

Bool TraceGeometryEnhanced	(	const Ray *	ray,
		Float	maxdist,
		const RayHitID &	last_hit,
		Int32	raydepth,
		RAYBIT	raybits,
		Vector64 *	oldray,
		SurfaceIntersection *	si
	)		const

Calculates an intersection for ray at a certain ray depth.

Note: To avoid self-intersection, pass the current hit as last_hit. To include all polygons, set last_hit to RayHitID().

Parameters

[in]	ray	The ray to find the intersection for. The caller owns the pointed ray.
[in]	maxdist	The maximum distance to check for intersections.
[in]	last_hit	The last intersection. Pass RayHitID() to include all polygons.
[in]	raydepth	The ray depth.
[in]	raybits	The rays flags: RAYBIT
[in]	oldray	Should be set to nullptr.
[out]	si	The surface intersection structure to take the calculated hit data. The caller owns the pointed surface intersection.

Returns: true if an intersection was found, otherwise false.

◆ GetSurfaceData()

void GetSurfaceData	(	SurfaceData *	cd,
		Bool	calc_illum,
		Bool	calc_shadow,
		Bool	calc_refl,
		Bool	calc_trans,
		Ray *	ray,
		const SurfaceIntersection &	si
	)

Retrieves information for a point on a surface.

Parameters

[out]	cd	The retrieved surface information. The caller owns the pointed surface information.
[in]	calc_illum	true if the point shall be shaded (e.g. the sky is not shaded so is false).
[in]	calc_shadow	true if a shadow shall be calculated.
[in]	calc_refl	true if a reflection shall be calculated.
[in]	calc_trans	true if a transparency shall be calculated.
[in]	ray	The ray. The caller owns the pointed ray.
[in]	si	The surface intersection data.

◆ CentralDisplacePointUV()

Vector CentralDisplacePointUV	(	const RayObject *	op,
		Int32	local_id,
		Int32	uu,
		Int32	vv
	)		const

Calculates the subpolygon displacement for a polygon local_id of object op.
SPD has to be enabled for the object. The indices uu and vv are >=0 and uu + vv <= op->spd_displacement.
See CalcDisplacementNormals() for an example.

Note: Cinema 4D automatically converts quads to triangles only if an objects has SPD enabled.

Parameters

[in]	op	The ray object. The caller owns the pointed object.
[in]	local_id	The local polygon ID.
[in]	uu	The R coordinate.
[in]	vv	The S coordinate.

Returns: The displacement vector.

◆ CentralDisplacePointFromUVPoint()

Vector CentralDisplacePointFromUVPoint	(	const RayObject *	op,
		Int32	local_id,
		Bool	bFirst,
		Float	l1,
		Float	l2,
		const Vector &	uv,
		const UVWStruct &	uvw
	)		const

Calculates the subpolygon displacement of a point uv in polygon local_id of object op.
SPD has to be enabled for the object. The uv point is expected to be within the triangle local_id. The parameters l1 and l2 are expected to be the triangular barycentric coordinates of point uv within a the triangle. If local_id corresponds to a triangle within a quad, bFirst indicates which of the sub triangles local_id is.

Note: Cinema 4D automatically converts quads to triangles only if an objects has SPD enabled.

Since: R18

Parameters

[in]	op	The ray object. The caller owns the pointed object.
[in]	local_id	The abc or acd triangle id of a quad polygon.
[in]	bFirst	Whether local_id corresponds to the abc or acd triangle of the quad polygon.
[in]	l1	First barycentric coordinate.
[in]	l2	Second barycentric coordinate.
[in]	uv	UV coordinates of the point to displace.
[in]	uvw	UVW polygon enclosing the 'uv' point.

Returns: The displacement vector.

◆ CalcDisplacementNormals()

Vector CalcDisplacementNormals	(	Float	par_u,
		Float	par_v,
		Int32	u0,
		Int32	v0,
		Int32	u1,
		Int32	v1,
		Int32	u2,
		Int32	v2,
		const Vector &	a,
		const Vector &	b,
		const Vector &	c,
		const RayObject *	op,
		Int32	polynum
	)		const

Calculates the normal at a point on polygon polynum of object op.
SPD has to be enabled for the object. The indices a/b/c are the corner points of the subpolygon and u0/v0/u1/v1/u2/v2 are the r/s coordinates for it.
These are passed here since one usually has to calculate them before, so for speed reasons they do not have to be calculated again.
Example:

Int32 num = lSubID & ~(1<<31), u0, u1, u2, v0, v1, v2;
 
u0 = u1 = u2 = num / m_pRayObject->spd_displacement;
v0 = v1 = v2 = num % m_pRayObject->spd_displacement;
if (lSubID & (1<<31))
  { u1--; v2--; }
else
  { u1++; v2++; }
 
tri0 = m_pVolumeData->CentralDisplacePointUV(m_pRayObject, lLocalID, u0, v0);
tri1 = m_pVolumeData->CentralDisplacePointUV(m_pRayObject, lLocalID, u1, v1);
tri2 = m_pVolumeData->CentralDisplacePointUV(m_pRayObject, lLocalID, u2, v2);
 
n = m_pVolumeData->CalcDisplacementNormals(rParU, rParV, u0, v0, u1, v1, u2, v2, tri0, tri1, tri2, m_pRayObject, lLocalID));

The sub-ID and par_u/par_v e.g. are retrieved with VolumeData::TraceGeometry().

Parameters

[in]	par_u	The U parameter.
[in]	par_v	The V parameter.
[in]	u0	The R coordinate for a.
[in]	v0	The S coordinate for a.
[in]	u1	The R coordinate for b.
[in]	v1	The S coordinate for b.
[in]	u2	The R coordinate for c.
[in]	v2	The S coordinate for c.
[in]	a	The first corner point of the sub-polygon.
[in]	b	The second corner point of the sub-polygon.
[in]	c	The third corner point of the sub-polygon.
[in]	op	The ray object. The caller owns the pointed object.
[in]	polynum	The polygon index.

Returns: The displacement normal.

◆ CentralDisplaceUVGetNormal()

Vector CentralDisplaceUVGetNormal	(	const RayObject *	op,
		Int32	local_id,
		Int32	uu,
		Int32	vv
	)		const

Private.

◆ CentralDisplaceGetSurfaceNormalFromUVPoint()

Vector CentralDisplaceGetSurfaceNormalFromUVPoint	(	const RayObject *	op,
		Int32	local_id,
		Bool	bFirst,
		Float	par_u,
		Float	par_v,
		const Vector &	uv,
		const UVWStruct &	uvw
	)		const

Computes the surface normal at the world point corresponding to the UV point at uv. Takes into account whether surface subdivision is active and if true, whether surface rounding is applied.

Since: R18

Parameters

[in]	op	RayObject containing the UV point and polygon in question.
[in]	local_id	Id of the triangle containing the point uv.
[in]	bFirst	If local_id is within a quad, whether local_id is the 'abc' or 'acd' triangle.
[in]	par_u	'u' barycentric coordinate of uv within the triangle.
[in]	par_v	'v' barycentric coordinate of uv within the triangle.
[in]	uv	UV point to evaluate.
[in]	uvw	UVW polygon enclosing the 'uv' point.

Returns: The surface normal at the world point corresponding to the UV point at uv.

◆ CentralDisplaceGetShadingNormalFromUVPoint()

Vector CentralDisplaceGetShadingNormalFromUVPoint	(	const RayObject *	op,
		Int32	local_id,
		Bool	bFirst,
		Float	par_u,
		Float	par_v,
		const Vector &	uv,
		const UVWStruct &	uvw
	)		const

Computes the shading normal at the world point corresponding to the UV point at uv. Takes into account whether surface subdivision is active and if true, whether surface rounding is applied.

Since: R18

Parameters

[in]	op	RayObject containing the UV point and polygon in question.
[in]	local_id	Id of the triangle containing the point uv.
[in]	bFirst	If local_id is within a quad, whether local_id is the 'abc' or 'acd' triangle.
[in]	par_u	'u' barycentric coordinate of uv' within the triangle.
[in]	par_v	'v' barycentric coordinate of uv within the triangle.
[in]	uv	Point to evaluate.
[in]	uvw	UVW polygon enclosing the 'uv' point.

Returns: The shading normal at the world point corresponding to the UV point at uv.

◆ CentralDisplacePointUVGetBarycentric()

Bool CentralDisplacePointUVGetBarycentric	(	const RayObject *	op,
		Int32 &	local_id,
		Int32 &	uu,
		Int32 &	vv,
		RayPolyWeight &	bary,
		Bool &	displaceQuad
	)		const

Private.

◆ GetDisplaceInfo()

Bool GetDisplaceInfo	(	const RayObject *	op,
		DisplaceInfo &	info
	)		const

Private.

◆ GetDisplaceNeighbor()

Int32 GetDisplaceNeighbor	(	const RayObject *	op,
		Int32	local_id,
		Int32	side
	)		const

Private.

◆ CorrectLocalID()

void CorrectLocalID	(	const RayObject *	op,
		Int32 &	local_id
	)		const

Private.

◆ CalcBackTransformPoint()

Vector CalcBackTransformPoint ( ) const

Calculates the back transform point.

Note: Every time the texture matrix multiplies the back point this method should be used: Call CalcBackTransformPoint():
p = cd->vd->CalcBackTransformPoint();

Instead of writing:
p = cd->vd->tex->im * cd->vd->back_p;

Returns: The back transform point.

◆ CalcMotionObjectMatrixInv()

Matrix64 CalcMotionObjectMatrixInv ( const RayObject * op ) const

Calculates the inverse matrix of the object when in motion blur.

Since: R16

Parameters

[in] op The object. The caller owns the pointed object.

Returns: The inverse matrix of the object for motion blur.

◆ SkipRenderProcess()

void SkipRenderProcess ( )

Skips the render process.

Note: Useful for custom renderers.

◆ GetRenderInstance()

const Render* GetRenderInstance ( ) const

Retrieves the current Render* instance.

Returns: The render instance.

◆ GetDUDV()

void GetDUDV	(	const TexData *	tex,
		const Vector64 &	p,
		const Vector64 &	phongn,
		const Vector64 &	orign,
		const RayHitID &	hit,
		Bool	forceuvw,
		Vector *	ddu,
		Vector *	ddv,
		Bool	usetangents,
		const RayPolyWeight *	weight
	)		const

Calculates the DU/DV components for a texture and a given point/normal.
Only necessary for channel shaders that normally cannot access this information.

Note: Traditionally we would estimate the DU/DV for UV mapping from surrounding points.
But it can be inaccurate at the edges for smooth surfaces. Just like we precompute phong normals to compute smooth normals, we added an option (usetangents) to use UV tangents to compute correct DU/DV at any point.
It is a more accurate method that avoid many of the previous problems.

Parameters

[in]	tex	The texture to initialize. The caller owns the pointed texture data.
[in]	p	The surface point.
[in]	phongn	The shading normal.
[in]	orign	The original normal.
[in]	hit	The global RayHitID to get the UV coordinate in.
[in]	forceuvw	true to force UVW calculation.
[out]	ddu	Assigned the calculated DU component.
[out]	ddv	Assigned the calculated DV component.
[in]	usetangents	true to use UV tangents to compute DU/DV components.
[in]	weight	Optional weight for the polygon.

◆ GetDUDVFromUVPoint()

void GetDUDVFromUVPoint	(	const RayObject *	op,
		const TexData *	tex,
		Float	par_u,
		Float	par_v,
		const Vector64 &	uv,
		const Vector64 &	p,
		const Vector64 &	phongn,
		const Vector64 &	orign,
		const UVWStruct &	uvw,
		RayHitID &	hit,
		Bool	forceuvw,
		Vector *	ddu,
		Vector *	ddv,
		Bool	usetangents
	)

Calculates the DU/DV components for a texture and a given point/normal. Takes into account geometry rounding.

Since: R18

Parameters

[in]	op	Ray object on which the tangents are being evaluated.
[in]	tex	The texture to initialize. The caller owns the pointed texture data.
[in]	par_u	'u' triangle barycentric coordinate for uv point
[in]	par_v	'v' triangle barycentric coordinate for uv point
[in]	uv	The UV point for which to evaluate the tangents.
[in]	p	The surface point.
[in]	phongn	The shading normal. See CentralDisplaceGetShadingNormalFromUVPoint
[in]	orign	The surface normal. See CentralDisplaceGetSurfaceNormalFromUVPoint
[in]	uvw	UVW polygon enclosing the 'uv' point.
[in]	hit	The RayHitID containing the triangle info for the 'uv' point.
[in]	forceuvw	true to force UVW calculation.
[out]	ddu	The calculated DU tangent vector.
[out]	ddv	The calculated DV co-tangent vector.
[in]	usetangents	true to use UV tangents to compute DU/DV components.

◆ InitSurfacePointProperties()

void InitSurfacePointProperties ( TexData * td )

Initializes the surface point properties in the texture data td.

Parameters

[in] td The texture data to initialize. The caller owns the pointed texture data.

◆ AttachVolumeDataFake()

Bool AttachVolumeDataFake	(	BaseObject *	camera,
		const BaseContainer &	renderdata
	)

Attaches camera data to the VolumeData structure that is not available otherwise (like camera information, renderdata and screen pixel position).
Enables the following render functions to work: SetXY(), GetXY(), ProjectPoint() (frontal projection), GetRay(), ScreenToCamera(), CameraToScreen(), GetParameter(), GetRayCamera().
To delete it either free the VolumeData or call AttachVolumeData(nullptr, empty_container).
Here is an example of how to use this method:

VolumeData *vd = VolumeData::Alloc();
BaseDraw *bd = doc->GetRenderBaseDraw();
BaseObject *camera = bd?bd->GetSceneCamera(doc):nullptr;
RenderData *rdata = doc->GetActiveRenderData();
if (vd && camera && rdata && vd->AttachVolumeDataFake(camera,*rdata->GetDataInstance()))
{
  Int32 x,y;
  Ray ray;
  for (y=0; y<10; y++)
  {
    for (x=0; x<rdata->GetDataInstance()->GetInt32(RDATA_XRES); x++)
    {
      vd->GetRay(x,y,&ray);
      GePrint(String::FloatToString(ray.v.x)+String(" ")+String::FloatToString(ray.v.y)+String(" ")+String::FloatToString(ray.v.z));
    }
  }
}
VolumeData::Free(vd);

Parameters

[in]	camera	The camera to attach. The caller owns the pointed camera.
[in]	renderdata	The render data container.

Returns: true if successful, otherwise false.

◆ HasVolumeDataFake()

Bool HasVolumeDataFake ( ) const

Checks if the VolumeData has fake attached.

Returns: true if the volume data has fake data attached, otherwise false.

◆ SaveShaderStack()

Bool SaveShaderStack	(	RayShaderStackElement *&	stack,
		Int32 &	stack_cnt
	)

Private.

◆ RestoreShaderStack()

Bool RestoreShaderStack	(	RayShaderStackElement *	stack,
		Int32	stack_cnt
	)

Private.

◆ GetRaySky() [2/2]

const RayObject* GetRaySky ( Int32 index ) const

Retrieves the index-th sky object (index ranging from 0 to GetRaySkyCount()-1). The object is of type O_SKY.

Parameters

[in] index The sky object index.

Returns: The sky object, or nullptr. The volume data owns the pointed sky object.

◆ GetRaySkyCount()

Int32 GetRaySkyCount ( ) const

Gets the number of sky objects.

Returns: The number of sky objects.

◆ GetRaySampler()

RaySampler* GetRaySampler	(	void *	guid,
		Int32	depth
	)

Private.

◆ GetRayWeight()

Float GetRayWeight ( ) const

Private.

◆ CalcAmbientOcclusion()

Float CalcAmbientOcclusion	(	SurfaceIntersection *	si,
		RaySampler *	sampler,
		Float	minlength,
		Float	maxlength,
		Float	index,
		Bool	self,
		Bool	trans,
		Float	weight,
		Bool	reverse
	)

Private.

◆ CalcSubsurfaceScattering()

Vector CalcSubsurfaceScattering	(	Vector	scattering,
		Vector	absorption,
		Vector	diffuse,
		Float	ior
	)

Private.

◆ GetStreamCount()

Int32 GetStreamCount ( ) const

Retrieves the number of stereoscopic streams that are rendered.

Returns: The number of stereoscopic streams.

◆ GetStreamRay()

void GetStreamRay	(	Int32	stream,
		Float	x,
		Float	y,
		Ray *	ray
	)		const

The same as GetRay() but just for stereoscopic streams.

Parameters

[in]	stream	The stereoscopic stream: 0 <= stream < GetStreamCount()
[in]	x	The X position for the view ray in screen space coordinates.
[in]	y	The Y position for the view ray in screen space coordinates.
[in]	ray	Assigned the generated view ray. The caller owns the pointed ray.

◆ CalcIndirectIllumination()

Bool CalcIndirectIllumination	(	RayHemisphere *	hs,
		Float	weight
	)

Entry point into Cinema 4D GI calculation. Performs the full 3 phase MIS sampling for indirect illumination.
CalcIndirectIllumination() can also be used to compute AO. It is handy as it computes also gradients allowing very fast AO with interpolation.

Parameters

[in]	hs	Controls the GI and if gradient information needs to be computed or not for the caches.
[in]	weight	The weight.

Returns: true if successful, otherwise false.

◆ CalcIndirectPDF()

Bool CalcIndirectPDF	(	const Vector &	point,
		const Vector &	normal,
		const Vector &	ray_in,
		const Vector &	ray_out,
		Float &	pdf_qmc,
		Float &	pdf_area,
		Float &	pdf_portal,
		Float &	pdf_sky
	)

Calculates the PDF (Probability Distribution) for the given intersection and 2 ray directions.

Parameters

[in]	point	The point.
[in]	normal	The normal.
[in]	ray_in	The ray in direction.
[in]	ray_out	The ray out direction.
[out]	pdf_qmc	Assigned the PDF QMC.
[out]	pdf_area	Assigned the PDF area.
[out]	pdf_portal	Assigned the PDF portal.
[out]	pdf_sky	Assigned the PDF sky.

Returns: true if successful, otherwise false.

◆ CalcIndirectPath()

Bool CalcIndirectPath	(	VolumeData *	sd,
		const Vector &	dir,
		void *	source,
		void *	target
	)

Private.

◆ CreateRadianceMaps()

RayRadianceObject* CreateRadianceMaps ( )

Private.

◆ GetRadianceMaps()

RayRadianceObject* GetRadianceMaps ( )

Private.

◆ CalcRadianceValue()

Vector CalcRadianceValue	(	Ray *	ray,
		const SurfaceIntersection &	si
	)

Calculates the values for radiance maps.

Parameters

[in]	ray	The ray. The caller owns the pointed ray.
[in]	si	The surface intersection structure. The caller owns the pointed surface intersection.

Returns: The radiance value.

◆ CalcRadiancePoly()

Vector CalcRadiancePoly	(	RayRadianceObject *	obj,
		SurfaceIntersection *	si,
		Int32	poly,
		Int32	u,
		Int32	v,
		Bool	back
	)

Computes the radiance for the given object and polygon index. Used by the Radiosity Maps when computing the color for each "texel" on the poly.

Parameters

[in]	obj	The radiance object.
[in]	si	The surface intersection structure. The caller owns the pointed surface intersection.
[in]	poly	The polygon index.
[in]	u	The U texel position for the radiosity map.
[in]	v	The V texel position for the radiosity map.
[in]	back	Set to true to computes the illumination for the back side.

Returns: The radiance value.

◆ IsPhysicalRender()

Bool IsPhysicalRender ( ) const

Checks if the Physical Render is being used to render the volume data.

Returns: true if the Physical Render is used to render, otherwise false.

◆ GetPhysicalCameraIntensity()

Float GetPhysicalCameraIntensity ( ) const

Used in Physical Render (always returns 1.0 in Standard).

Note: This method is handy if the plugin does any custom drawing into the buffer. e.g. it can be used in the GI/AO prepass to make sure the prepass intensity matches the render.

Returns: The relative intensity of the camera when exposure is used.

◆ SetPhysicalRayTime()

void SetPhysicalRayTime ( Float time )

Used in Physical Render. Sets the time state inside the renderer.
The value range is from 0.0 to 1.0, and corresponds to the frame exposure range as specified by the camera.

Note: This method is useful to customize the time when rays are traced before the rendering starts, for example in various prepass tasks to make sure Motion Blur is properly handled.

Parameters

[in] time The time.

◆ GetMotionObject()

const RayMotionObject* GetMotionObject ( RayObject * op )

Retrieves the motion blur information for an object.

Since: R17.032

Parameters

[in] op The object. The caller owns the pointed op.

Returns: The motion data.

◆ GetMotionLight()

const RayMotionLight* GetMotionLight ( RayLight * light )

Retrieves the motion blur information for a light.

Since: R17.032

Parameters

[in] light The light. The caller owns the pointed light.

Returns: The motion data.

◆ GetMotionCamera()

const RayMotionCamera* GetMotionCamera ( Int32 stream )

Retrieves the motion blur information for a camera.

Since: R17.032

Parameters

[in] stream The camera stream.

Returns: The motion data.

◆ GetTile()

Bool GetTile	(	Int32 &	xMin,
		Int32 &	yMin,
		Int32 &	xMax,
		Int32 &	yMax,
		Int32 &	renderThreadIndex
	)		const

Queries information about the currently rendered RayTile.

Since: R16.038

Warning: Not valid during Videopost execution, with the exception of VIDEOPOSTCALL::TILE.

Parameters

[out]	xMin	Assigned the upper left of the rendered tile.
[out]	yMin	Assigned the lower left of the rendered tile.
[out]	xMax	Assigned the upper right of the rendered tile.
[out]	yMax	Assigned the lower right of the rendered tile.
[out]	renderThreadIndex	Assigned the index of the render thread that invoked VIDEOPOSTCALL::TILE and 'owns' the tile. Note that pixel calculation can be distributed on multiple render threads.

Returns: true if successful, otherwise false.

Public Member Functions

Private Member Functions

Alloc/Free

Additional Inherited Members

Constructor & Destructor Documentation

◆ VolumeData()

◆ ~VolumeData()

Member Function Documentation

◆ Alloc()

◆ Free()

◆ CalcArea()

◆ CalcShadow()

◆ IlluminateSurfacePoint()

◆ IlluminateAnyPoint()

◆ IlluminanceSurfacePoint()

◆ IlluminanceAnyPoint()

◆ IlluminanceSimple()

◆ GetCurrentCPU()

◆ GetCPUCount()

◆ Obj_to_Num()

◆ GetObj()

◆ GetObjCount()

◆ GetUVW()

◆ GetNormals()

◆ GetTexData()

◆ GetNormal()

◆ GetRayPolyState()

◆ GetUniqueID()

◆ GetSmoothedNormal()

◆ GetRS()

◆ GetWeights()

◆ GetLight()

◆ GetLightCount()

◆ Light_to_Num()

◆ GetRayData()

◆ GetRayCamera()

◆ GetRayParameter()

◆ GetRayEnvironment()

◆ GetRaySky() [1/2]

◆ GetRayForeground()

◆ GetRayBackground()

◆ GetRay()

◆ ScreenToCamera()

◆ CameraToScreen()

◆ CalcHardShadow()

◆ GetPointUVW()

◆ ProjectPoint()

◆ StatusSetText()

◆ StatusSetBar()

◆ StatusSetSpinMode()

◆ CalcVisibleLight()

◆ GetXY()

◆ SetXY()

◆ GetSceneBoundaries()

◆ CopyTo()

◆ Init()

◆ OutOfMemory()

◆ CalcFgBg()

◆ GetLightFalloff()

◆ TestBreak()

◆ GetVideoPost()

◆ FindVideoPost()

◆ GetFragments()

◆ AddLensGlow()

◆ SampleLensFX()

◆ TranslateObjIndex()

◆ TranslatePolygon()

◆ TraceColor()

◆ TraceColorDirect()

◆ TraceGeometry()

◆ TraceGeometryEnhanced()

◆ GetSurfaceData()

◆ CentralDisplacePointUV()

◆ CentralDisplacePointFromUVPoint()

◆ CalcDisplacementNormals()

◆ CentralDisplaceUVGetNormal()

◆ CentralDisplaceGetSurfaceNormalFromUVPoint()

◆ CentralDisplaceGetShadingNormalFromUVPoint()

◆ CentralDisplacePointUVGetBarycentric()

◆ GetDisplaceInfo()