Gradient Shader

Helper

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On 02/09/2012 at 13:36, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   13
Platform:   Windows ;   Mac OSX ;
Language(s) :     C++ ;

---------
Hi,

can anybody please help me to retrieve the data of a gradien shader? The code below always provides NULL. Am I using the wrong Resource ID? I tried it with the ones from xs**gradient.h, they match the shader panel in the attribute manager.

  
BaseShader *sh = chn->GetShader();   
if (sh->GetType() == Xgradient)   
{                  
    if (sh->GetParameter(DescLevel(1000), d, DESCFLAGS_GET_0)) // Xs**gradient   
    {   
        Gradient *gr = (Gradient* )d.GetCustomDataType(CUSTOMDATATYPE_GRADIENT);   
        if (gr)   
        {   
             // ... gr is NULL   
        }   
    }   
}

Helper

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On 02/09/2012 at 17:01, xxxxxxxx wrote:

I'm using Python but maybe you need to use something like InitRenderStructure()
and InitRender(gr) ?
Then possibly get the pixel at UVW x,y.
Haven't done it with a gradient shader but rather a Color Gradient Userdata.

Cheers
Lennart

Helper

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On 03/09/2012 at 00:53, xxxxxxxx wrote:

Hello Klaus,

BaseContainer::GetCustomDataType() accepts two arguments. The first one is the ID of the description element, the second the ID of the data-type.

Gradient* gr = (Gradient* ) d.GetCustomDataType(MY_GRADIENT_ID, CUSTOMDATATYPE_GRADIENT);

If the gradient is part of your own description for your plugin, you need to initialize it in NodeData::Init().

-Niklas

Helper

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On 03/09/2012 at 01:08, xxxxxxxx wrote:

Originally posted by xxxxxxxx

Hello Klaus, BaseContainer::GetCustomDataType() accepts two arguments. The first one is the ID of the description element, the second the ID of the data-type.
Gradient* gr = (Gradient* ) d.GetCustomDataType(MY_GRADIENT_ID, CUSTOMDATATYPE_GRADIENT);

I think the 'd' in this case is a GeData, not a BaseContainer, and so there's only one argument. I would check the value in the DescID() call, is 1000 really correct?

Steve

Helper

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On 03/09/2012 at 02:01, xxxxxxxx wrote:

Hi Steve,

yes, d is GeData d. I'm going this way successfully to get the gradient type :

  
GeData     d;   
LONG     type = 0;   
  
if (sh->GetParameter(DescLevel(1001), d, DESCFLAGS_GET_0)) // SLA_GRADIENT_TYPE 1001   
{        
     type = (LONG)d.GetLong(); // => e.g. 2000 for SLA_GRADIENT_TYPE_2D_U   
}

So I assume the way to get the data is pricipally right.

@Niklas: no it's not my plugin using the gradient. I want to get it from a material.

Here are the IDs of Xs**gradient.h

  
Xs**gradient                          = 1000,   
  
SLA_GRADIENT_TYPE                     = 1001,   // LONG   
    SLA_GRADIENT_TYPE_2D_U              = 2000,   
    SLA_GRADIENT_TYPE_2D_V,   
    SLA_GRADIENT_TYPE_2D_DIAG,   
    SLA_GRADIENT_TYPE_2D_RAD,   
    SLA_GRADIENT_TYPE_2D_CIRC,   
    SLA_GRADIENT_TYPE_2D_BOX,   
    SLA_GRADIENT_TYPE_2D_STAR,   
    SLA_GRADIENT_TYPE_2D_FOUR_CORNER,   
    SLA_GRADIENT_TYPE_3D_LINEAR,   
    SLA_GRADIENT_TYPE_3D_CYLINDRICAL,   
    SLA_GRADIENT_TYPE_3D_SPHERICAL,   
  
SLA_GRADIENT_CYCLE                    = 1002,   // Bool   
SLA_GRADIENT_START                    = 1003,   // Vector   
SLA_GRADIENT_END                      = 1004,   // Vector   
SLA_GRADIENT_RADIUS                   = 1005,   // Real   
SLA_GRADIENT_SPACE                    = 1006,   // LONG   
    SLA_GRADIENT_SPACE_TEXTURE          = 2020,   
    SLA_GRADIENT_SPACE_OBJECT,   
    SLA_GRADIENT_SPACE_WORLD,   
    SLA_GRADIENT_SPACE_CAMERA,   
    SLA_GRADIENT_SPACE_SCREEN,   
    SLA_GRADIENT_SPACE_RASTER,   
  
SLA_GRADIENT_TURBULENCE               = 1011, // real   
...

Helper

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On 03/09/2012 at 02:23, xxxxxxxx wrote:

I tried the code from Niklas using a base container. That's also the way the gradient sdk eample uses. Type is correct, but the gradient pointer is NULL!

  
BaseContainer *bc = sh->GetDataInstance();   
Gradient *gr = (Gradient* )bc->GetCustomDataType(1000, CUSTOMDATATYPE_GRADIENT); // => NULL   
LONG type = bc->GetLong(1001); => correct values

Helper

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On 03/09/2012 at 07:09, xxxxxxxx wrote:

Right, 1001 does indeed work as the gradient type. However, the actual colour gradient is not 1000 but 1007 (defined as SLA_GRADIENT_GRADIENT) - try that and see if it works.

Steve

Helper

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On 03/09/2012 at 08:09, xxxxxxxx wrote:

Yep! That's it. Don't understand, how I could miss it in the h file.

  
SLA_GRADIENT_GRADIENT                 = 1007,   // Gradient

Helper

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On 03/09/2012 at 12:24, xxxxxxxx wrote:

Easily done, I've achieved that error many times

Steve

Helper

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On 03/09/2012 at 13:12, xxxxxxxx wrote:

Hi Klaus,

why are you not using the actual symbols in the code?

-Nik

Helper

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On 04/09/2012 at 02:27, xxxxxxxx wrote:

you mean the resource IDs? I do so normally, but xs**gradient.h couldn't be found by the compiler. So I would have to setup a path, but I wasn't sure until now, that it is the right file.