Maya 2016 MPxHwShaderNode glGeometry/geometry not called

[Anonymous]

I have created my own custom shader inheriting from MPxHwShaderNode -- and the virtual functions geometry / glGeometry never get called. -- However the compute virtual function does get called.

How do I get these geometry/glGeometry functions to get called?

Here is a snippet of the header file:

class HwShader : public MPxHwShaderNode
{
public:
void postConstructor() override;

MStatus compute(const MPlug&, MDataBlock&) override;

MStatus glGeometry(const MDagPath& shapePath,
int glPrim, unsigned int writeMask, int indexCount, const unsigned int* indexArray, int vertexCount, const int * vertexIDs, const float * vertexArray, int normalCount, floatArrayPtr normalArrays, int colorCount, floatArrayPtr colorArrays, int texCoordCount, floatArrayPtr texCoordArrays) override;

MStatus geometry(const MDrawRequest& request, M3dView& view, int prim, unsigned int writable, int indexCount, const unsigned int * indexArray, int vertexCount, const int * vertexIDs, const float * vertexArray, int normalCount, floatArrayPtr normalArrays, int colorCount, floatArrayPtr colorArrays, int texCoordCount, floatArrayPtr texCoordArrays) override;

int colorsPerVertex() override;

int normalsPerVertex() override;

int texCoordsPerVertex() override;

bool hasTransparency() override;

bool provideVertexIDs() override;

static void* creator();

static MStatus initialize();

MStatus bind(const MDrawRequest &request, M3dView &view) override;

MStatus unbind(const MDrawRequest &request, M3dView &view) override;

MStatus glBind(const MDagPath& path) override;

MStatus glUnbind(const MDagPath& path) override;

const static MTypeId typeId;

const static MString typeName;
};

//Snippet of initialize plugin
MStatus initializePlugin(MObject obj)
{
MStatus status;

MFnPlugin shaderPlugin(obj, "Shader");

// a classification for where the node will appear on the create menus
// of the multilister and hypershade.
const MString UserClassify("shader/surface/utility");

shaderPlugin.registerDragAndDropBehavior(ShaderBehavior::typeName, IugoShaderBehavior::creator);

status = shaderPlugin.registerNode(HwShader::typeName, HwShader::typeId, HwShader::creator, HwShader::initialize, MPxNode::Type::kHwShaderNode, &UserClassify);
}

[cheng_xi_li]

Hi ikeshet,

Are you using it with Viewport 2? It won't support VP2. If you want to implement custom drawing for Viewport 2, please implement MPxShadingNodeOverride.

Yours,

Li

[Anonymous]

I have tried using the MPxShadingNodeOverride as well.
It's draw call also does not get called.

I have tried switching the Renderer viewport to both legacy and VP2 -- and still does not work

[Anonymous]

class HwShaderOverride : public MHWRender::MPxShaderOverride
{
public:
HwShaderOverride(const MObject& obj) : MHWRender::MPxShaderOverride(obj)
{

}

MString initialize(const MInitContext& initContext, MInitFeedback& initFeedback) override;

bool handlesDraw(MHWRender::MDrawContext& context) override;

bool draw(MHWRender::MDrawContext& context, const MHWRender::MRenderItemList& renderItemList) const override;

static MHWRender::MPxShaderOverride* Creator(const MObject& obj);
};

MHWRender::MPxShaderOverride* HwShaderOverride::Creator(const MObject& obj)
{
return new HwShaderOverride(obj);
}

//This function never gets called

bool HwShaderOverride::handlesDraw(MHWRender::MDrawContext & context)
{
std::cerr << "Handles Draw" << endl;

return true;
}

MString HwShaderOverride::initialize(const MInitContext& initContext, MInitFeedback& initFeedback)
{
return MString("Autodesk Maya IugoHwShaderOverride");
}

//This function never gets called too

bool HwShaderOverride::draw(MHWRender::MDrawContext& context, const MHWRender::MRenderItemList& renderItemList) const
{
std::cerr << "draw" << endl;

MHWRender::MPxShaderOverride::drawGeometry(context);

return true;
}

[Anonymous]

In my Draw / Geometry call -- Even if I leave it blank / with just a print statement -- it stills draws the object and 2 never enters my draw call

[Anonymous · Accepted solution]

Sigh.

After a long time -- I have figured out that I did not have the Material rendering set in Maya -- hence why nothing was being called.

[Anonymous]

Hi ikeshet,

I also tried an older code of mine from 2010 in Maya 2015/2016 and had the same problem.
So what do you mean by "Material rendering not set"?

Thanks a lot!