TexData Struct Reference

#include <c4d_shader.h>

Detailed Description

Texture information.

Note

Has to be created with Alloc() and destroyed with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

The ox, oy and m values may differ from the values specified in the dialog, these are a precalculated raytracer representation. To better understand the meaning of those values please print this routine (it is the projection routine in source code):

Bool ShdProjectPoint(VolumeData *sd, TexData *tdp, Int32 lhit, const Vector &p, const Vector &n, Vector *uv)
{
  Float lenxinv=0.0,lenyinv=0.0;
  if (tdp->lenx!=0.0) lenxinv = 1.0/tdp->lenx;
  if (tdp->leny!=0.0) lenyinv = 1.0/tdp->leny;

  switch (tdp->proj)
  {
    case P_VOLUMESHADER:
    {
      *uv = p * tdp->im;
      return true;
    }

    case P_SPHERICAL: default:
    {
      Vector d = p * tdp->im;
      Float sq = Sqrt(d.x*d.x + d.z*d.z);
      if (sq==0.0)
      {
        uv->x = 0.0;
        if (d.y>0.0)
          uv->y = +0.5;
        else
          uv->y = -0.5;
      }
      else
      {
        uv->x = ACos(d.x/sq)/PI2;
        if (d.z<0.0) uv->x = 1.0-uv->x;

        uv->x -= tdp->ox;
        if (tdp->lenx>0.0 && uv->x<0.0)
          uv->x += 1.0;
        else if (tdp->lenx<0.0 && uv->x>0.0)
          uv->x -= 1.0;
        uv->x *= lenxinv;
        uv->y = ATan(d.y/sq)/PI;
      }
      uv->y = -(uv->y+tdp->oy)*lenyinv;
      break;
    }

    case P_SHRINKWRAP:
    {
      Vector d = p * tdp->im;
      Float   sn,cs,sq = Sqrt(d.x*d.x + d.z*d.z);

      if (sq==0.0)
      {
        uv->x = 0.0;
        if (d.y>0.0)
          uv->y = 0.0;
        else
          uv->y = 1.0;
      }
      else
      {
        uv->x = ACos(d.x/sq)/PI2;
        if (d.z<0.0) uv->x = 1.0-uv->x;
        uv->y = 0.5-ATan(d.y/sq)/PI;
      }

      SinCos(uv->x*PI2,sn,cs);

      uv->x = (0.5 + 0.5*cs*uv->y - tdp->ox)*lenxinv;
      uv->y = (0.5 + 0.5*sn*uv->y - tdp->oy)*lenyinv;
      break;
    }

    case P_CYLINDRICAL:
    {
      Vector d = p * tdp->im;
      Float sq = Sqrt(d.x*d.x + d.z*d.z);
      if (sq==0.0)
        uv->x = 0.0;
      else
      {
        uv->x = ACos(d.x/sq)/PI2;
        if (d.z<0.0) uv->x = 1.0-uv->x;

        uv->x -= tdp->ox;
        if (tdp->lenx>0.0 && uv->x<0.0)
          uv->x += 1.0;
        else if (tdp->lenx<0.0 && uv->x>0.0)
          uv->x -= 1.0;
        uv->x *= lenxinv;
      }
      uv->y = -(d.y*0.5+tdp->oy)*lenyinv;
      break;
    }

    case P_FLAT: case P_SPATIAL:
    {
      Vector d = p * tdp->im;
      uv->x =  (d.x*0.5-tdp->ox)*lenxinv;
      uv->y = -(d.y*0.5+tdp->oy)*lenyinv;
      break;
    }

    case P_CUBIC:
    {
      Vector d = p * tdp->im;
      Vector v = n ^ tdp->im;
      Int32   dir;

      if (Abs(v.x)>Abs(v.y))
      {
        if (Abs(v.x)>Abs(v.z))
          dir = 0;
        else
          dir = 2;
      }
      else
      {
        if (Abs(v.y)>Abs(v.z))
          dir = 1;
        else
          dir = 2;
      }

      switch (dir)
      {
        case 0: // x axis
        {
          if (v.x<0.0)
            uv->x = (-d.z*0.5-tdp->ox)*lenxinv;
          else
            uv->x = ( d.z*0.5-tdp->ox)*lenxinv;

          uv->y = -(d.y*0.5+tdp->oy)*lenyinv;
          break;
        }

        case 1:  // y axis
        {
          if (v.y<0.0)
            uv->y = ( d.z*0.5-tdp->oy)*lenyinv;
          else
            uv->y = (-d.z*0.5-tdp->oy)*lenyinv;

          uv->x = (d.x*0.5-tdp->ox)*lenxinv;
          break;
        }

        case 2: // z axis
        {
          if (v.z<0.0)
            uv->x = ( d.x*0.5-tdp->ox)*lenxinv;
          else
            uv->x = (-d.x*0.5-tdp->ox)*lenxinv;

          uv->y = -(d.y*0.5+tdp->oy)*lenyinv;
          break;
        }
      }

      break;
    }

    case P_FRONTAL:
    {
      RayParameter *param=sd->GetRayParameter();

      Float ox=0.0,oy=0.0,ax=param->xres,ay=param->yres;
      Int32 curr_x,curr_y,scl;
      sd->GetXY(&curr_x,&curr_y,&scl);
      uv->x = ((Float(curr_x)/Float(scl)-ox)/ax - tdp->ox)*lenxinv;
      uv->y = ((Float(curr_y)/Float(scl)-ox)/ay - tdp->oy)*lenyinv;
      break;
    }

    case P_UVW:
    {
      RayObject *op=sd->ID_to_Obj(lhit,nullptr);
      if (op && tdp->uvwind<op->uvwcnt && op->uvwadr[tdp->uvwind])
        *uv=sd->GetPointUVW(tdp,lhit,p);
      else
        uv->x = uv->y = 0.0;

      break;
    }
  }

  if (tdp->texflag&TEX_TILE)
    return true;
  else
    return uv->x>=0.0 && uv->x<=1.0 && uv->y>=0.0 && uv->y<=1.0;
}

Public Member Functions
void	Init (void)

Static Public Member Functions
static TexData *	Alloc ()
static void	Free (TexData *&td)

Public Attributes
Matrix	m
Matrix	im
Char	texflag
Char	additive
Char	proj
Char	side
Int32	restrict
Float	ox
Float	oy
Float	lenx
Float	leny
Float	repetitionx
Float	repetitiony
GeListNode *	mp
Int32	uvwind
BaseView *	camera
Char	uvbump
BaseTag *	link
Float	invLenx
Float	invLeny
Bool	parallaxUVW

Private Member Functions
	TexData ()
	~TexData ()

Constructor & Destructor Documentation

TexData()

TexData ( )

private

~TexData()

~TexData ( )

private

Member Function Documentation

Alloc()

static TexData* Alloc ( )

static

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

Returns

The allocated texture data, or nullptr if the allocation failed.

Free()

static void Free ( TexData *&  td )

static

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

Parameters

[in]

td

The texture data to destruct. If the pointer is nullptr nothing happens. The pointer is assigned nullptr afterwards.

Init()

void Init

(

void

)

Initializes the structure.

Member Data Documentation

m

Matrix m

The texture projection matrix.

Note

This actual value may differ from those specified in the dialog, these are a precalculated raytracer representation.

im

Matrix im

The inverse of the texture projection matrix.

texflag

Char texflag

The texture flags: TEX.

additive

Char additive

true to mix with other textures.

proj

Char proj

The texture projection: TextureProjectionTypes.

side

Char side

The side: SIDE.

restrict

Int32 restrict

This is either 0 for no restriction or the index to a restriction in a RayObject
To check if global polygon id applies to TexData tex using VolumeData sd use the following:

if (tex->restrict)
{
  if (!sd->op || sd->op->type!=O_POLYGON || tex->restrict>=sd->op->rscnt || !sd->op->rsadr[tex->restrict])
    return false;

  Int32 num;
  sd->ID_to_Obj(id,&num);

  if (!(sd->op->rsadr[tex->restrict][num>>5]&(1<<(num&31))))
    return false;
}
return true;

ox

Float ox

The X offset of the texture.

Note

This actual value may differ from the one specified in the dialog, these are a precalculated raytracer representation.

oy

Float oy

The Y offset of the texture.

Note

This actual value may differ from the one specified in the dialog, these are a precalculated raytracer representation.

lenx

Float lenx

The X length of the texture.

leny

Float leny

The Y length of the texture.

repetitionx

Float repetitionx

The repetition of U tiling.

repetitiony

Float repetitiony

The repetition of V tiling.

mp

GeListNode* mp

The material.

Note

Make sure to cast this to the right material type before using it.

uvwind

Int32 uvwind

The uvw index, access is through VolumeData::GetUVW().

camera

BaseView* camera

The current view.

uvbump

Char uvbump

The direct boolean representation of TEXTURETAG_UVBUMP.

link

BaseTag* link

The originating texture tag.

invLenx

Float invLenx

The inverted X length of the texture.

Since

R19.SP2

invLeny

Float invLeny

The inverted Y length of the texture.

Since

R19.SP2

parallaxUVW

Bool parallaxUVW

true if the UVW coordinates are changed by Parallax Mapping, otherwise false.

Since

R19.SP2