Shader to texture?

[Helper]

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On 04/11/2010 at 19:44, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R12 
Platform:   Windows  ;   
Language(s) :     C++  ;

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I have a material using a Xtiles shader in the color channel, and I want to convert it to a bitmap.
I followed the code here:
https://developers.maxon.net/forum/topic/5075/5001_reading-texture-data&KW=PluginShader&PID=20508#20508
However, InitRender() always returns 0.  No bitmap is generated.  All passed parameters appear valid.
How can I convert this shader to a bitmap?

  
 //BaseContainer *data = mat->GetDataInstance();  
 //PluginShader *shader = (PluginShader* )data->GetLink(MATERIAL_COLOR_SHADER, doc, Xbitmap);
 BaseChannel *channel = mat->GetChannel(CHANNEL_COLOR);  
 BaseShader *shader = channel->GetShader();
 Filename docpath = doc->GetDocumentPath();  
 String matname = mat->GetName();
 InitRenderStruct rs;  
 rs.version   = GetC4DVersion();  
 rs.time      = doc->GetTime();  
 rs.fps       = doc->GetFps();  
 rs.docpath   = docpath;  
 rs.matname   = &matname;  
 rs.errorlist = NULL;  
 rs.vd        = NULL;  
 rs.doc       = doc;  
 rs.thread    = NULL;  
 rs.flags     = INITRENDERFLAG_TEXTURES;
 BOOL br = shader->InitRender(rs); // returns zero
 BaseBitmap *bmp = shader->GetBitmap();  
 if (!bmp) return FALSE;  // returns NULL
 GePrint(LongToString(bmp->GetBw()));  
 GePrint(LongToString(bmp->GetBh()));
 shader->FreeRender();