class ISpecularCompositeShader : public BaseInterface
- Description:
- This class is only available in release 5 or later.
This class is only used to communicate some information between the 3ds Max Standard Material and the Shaders for the 3ds Max Standard Material. The information that the Shaders require that wasn't supplied previous is the RenderGlobalContext. This would be used by 3rd parties who want to write shaders for the 3ds Max standard material. This is only required if the shader performs operations that are not valid for arbitrary light values. For example: Using the default values, the Physical Sun has light multiplier values that are around 60.
Several standard 3ds Max shaders, like the Aniso and ONB shaders, composite specular highlights over the diffuse light, and the calculation looks something like:
color = diffuse * (1 - specular) + specular;
This works fine as long as specular is between 0 and 1. If specular goes above 1, you get all kinds of unusual artifacts. This calculation is done this way to prevent color clipping because of bright specular highlights. With lighting values at 60, the specular is frequently greater than 1.With an exposure control, the exposure control manages the color clipping and we can simply add the diffuse and specular components.
This interface gives the shader a chance to investigate the render parameters and decide how the lighting is to be combined.
This is usually done by using multiple inheritances and deriving the Shader Implementation from Shader and ISpecularCompositeShader.
The Shader needs to override GetInterface(Interface_ID id) and return the address of the ISpecularCompositShader interface and GetRequirements also needs to be overriden to return MTLREQ_PREPRO as one of the shader requirements.
Then the shader needs to implement ChooseSpecularMethod. The typical implementation is:
void CombineComponentsCompShader::ChooseSpecularMethod(TimeValue t, RenderGlobalContext* rgc)
{
useComposite = true;
if (rgc == NULL) {
ToneOperatorInterface* tint = static_cast<ToneOperatorInterface*>(
GetCOREInterface(TONE_OPERATOR_INTERFACE));
if (tint != NULL) {
ToneOperator* top = tint->GetToneOperator();
if (top != NULL && top->Active(t))
useComposite = false;
}
} else {
ToneOperator* top = rgc->pToneOp;
if (top != NULL && top->Active(t))
useComposite = false;
}
}
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| enum | LifetimeType { noRelease,
immediateRelease,
wantsRelease,
serverControlled
} |
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| static UtilExport void * | operator new (size_t size) |
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| static UtilExport void * | operator new (size_t size, int block_type, const char *filename, int line) |
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| static UtilExport void * | operator new (size_t size, const std::nothrow_t &e, const char *filename, int line) |
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| static UtilExport void * | operator new (size_t size, unsigned long flags) |
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| static UtilExport void * | operator new (size_t size, const std::nothrow_t &e, unsigned long flags) |
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| static UtilExport void * | operator new[] (size_t size) |
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| static UtilExport void * | operator new[] (size_t size, const std::nothrow_t &e) |
| | New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...
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| static UtilExport void * | operator new[] (size_t size, const char *filename, int line) |
| | New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
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| static UtilExport void * | operator new[] (size_t size, int block_type, const char *filename, int line) |
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| static UtilExport void * | operator new[] (size_t size, const std::nothrow_t &e, const char *filename, int line) |
| | New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...
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| static UtilExport void * | operator new[] (size_t size, unsigned long flags) |
| | New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
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| static UtilExport void * | operator new[] (size_t size, const std::nothrow_t &e, unsigned long flags) |
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| static UtilExport void | operator delete (void *ptr) |
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| static UtilExport void | operator delete (void *ptr, const std::nothrow_t &e) |
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| static UtilExport void | operator delete (void *ptr, const char *filename, int line) |
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| static UtilExport void | operator delete (void *ptr, int block_type, const char *filename, int line) |
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| static UtilExport void | operator delete (void *ptr, const std::nothrow_t &e, const char *filename, int line) |
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| static UtilExport void | operator delete (void *ptr, unsigned long flags) |
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| static UtilExport void | operator delete (void *ptr, const std::nothrow_t &e, unsigned long flags) |
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| static UtilExport void | operator delete[] (void *ptr) |
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| static UtilExport void | operator delete[] (void *ptr, const std::nothrow_t &e) |
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| static UtilExport void | operator delete[] (void *ptr, const char *filename, int line) |
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| static UtilExport void | operator delete[] (void *ptr, int block_type, const char *filename, int line) |
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| static UtilExport void | operator delete[] (void *ptr, const std::nothrow_t &e, const char *filename, int line) |
| | Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, nothing will happen. More...
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| static UtilExport void | operator delete[] (void *ptr, unsigned long flags) |
| | Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...
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| static UtilExport void | operator delete[] (void *ptr, const std::nothrow_t &e, unsigned long flags) |
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| static UtilExport void * | operator new (size_t size, void *placement_ptr) |
| | Placement new operator. More...
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| static UtilExport void | operator delete (void *ptr, void *placement_ptr) |
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| static UtilExport void * | aligned_malloc (size_t size, size_t alignment) |
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| static UtilExport void * | aligned_realloc (void *ptr, size_t size, size_t alignment) |
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| static UtilExport void | aligned_free (void *ptr) |
| | Frees a block of memory that was allocated with aligned_malloc/aligned_realloc. More...
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Inheritance diagram for ISpecularCompositeShader: