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On 02/03/2009 at 11:03, xxxxxxxx wrote:
User Information:
Cinema 4D Version: 10.5,11
Platform: Windows ; Mac ;
Language(s) : C++ ;
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Hi all.
This is probably a naive question, but is there a possibility to use a standard (to the user invisible) material inside a MaterialData plugin?
I'm working on an exporter to an external renderer which has a material system that can be translated more or less into the C4D material system. To avoid having to write the area light sampling for different BxDFs I wanted to use the C4D internal standard material instead, to do the actual shading.
The problem is, that I don't know how to setup the C4D Material instance, so that it's returning a different colour than black. I tried it with setting the parameters directly in it's container and by setting the description values (see below the code snippets). Nothing worked.
Does someone have an idea, what I'm doing wrong here?
Thanks,
Marcus
Here is some example/test code:
Class declaration in testmaterial.h:
> \> class TestMaterial : public MaterialData \> { \> INSTANCEOF(TestMaterial,MaterialData) \> \> \> public: \> \> static NodeData\* alloc(void); \> static Bool registerPlugin(void); \> \> virtual Bool Init(GeListNode \*node); \> virtual void Free(GeListNode \*node); \> virtual LONG InitRender(PluginMaterial \*mat, InitRenderStruct \*irs); \> virtual void FreeRender(PluginMaterial \*mat); \> virtual void CalcSurface(PluginMaterial \*mat, VolumeData \*vd); \> \> \> private: \> \> Material \*mC4DMaterial; \> }; \> \>
Implementation in testmaterial.cpp:
> \> NodeData\* TestMaterial::alloc(void) \> { \> return gNew TestMaterial; \> } \> \> \> Bool TestMaterial::registerPlugin(void) \> { \> return RegisterMaterialPlugin(1000001, \> "Test Material", \> 0, \> TestMaterial::alloc, \> String(), \> 0); \> } \> \> \> Bool TestMaterial::Init(GeListNode \*node) \> { \> mC4DMaterial = NULL; \> return TRUE; \> } \> \> \> void TestMaterial::Free(GeListNode \*node) \> { \> if (mC4DMaterial) Material::Free(mC4DMaterial); \> } \> \> \> LONG TestMaterial::InitRender(PluginMaterial \*mat, \> InitRenderStruct \*irs) \> { \> // create a new standard material \> mC4DMaterial = Material::Alloc(); \> if (!mC4DMaterial) { \> return LOAD_NOMEM; \> } \> \> // setup standard material \> mC4DMaterial->SetChannelState(CHANNEL_COLOR, TRUE); \> mC4DMaterial->SetParameter(DescID(MATERIAL_COLOR_COLOR), Vector(1.0, 0.0, 0.0), 0); \> mC4DMaterial->SetParameter(DescID(MATERIAL_COLOR_BRIGHTNESS), 1.0, 0); \> mC4DMaterial->Message(MSG_UPDATE); \> \> return LOAD_OK; \> } \> \> \> void TestMaterial::FreeRender(PluginMaterial \*mat) \> { \> if (mC4DMaterial) { \> Material::Free(mC4DMaterial); \> } \> } \> \> \> void TestMaterial::CalcSurface(PluginMaterial \*mat, \> VolumeData \*volumeData) \> { \> // test: set result colour to green \> volumeData->col.x = 0.0; \> volumeData->col.y = 1.0; \> volumeData->col.z = 0.0; \> if (mC4DMaterial->GetInfo() & SHADER_INITCALCULATION) { \> mC4DMaterial->InitCalculation(volumeData, INIT_SURFACE); \> } \> // this function call makes it black again -> something is going on here \> mC4DMaterial->CalcSurface(volumeData); \> } \> \>