sjc9999

No I'm trying to make the hole in the base the same size as the diameter of the sphere is this particular case. But in general I want my cone...

Yes, but if the scene is rotate such that the camera is looking straight from A to the center of the sphere you can't tell any clipping is happening is...

Some additional facts: The sphere always located at 0,0,0 and has a radius of 1. There are additional cones but the only thing that can clip them is the sphere....

Nope TopMostGroup3D does not have the desired affect. It always puts the sphere over the cone. I think the custom shader is the right approach. What are the shaders (vertex...

The problem appears to be this line in your code: texCoords.Add(ParseVertexAsVector2(layerValues, layerIndices, mappingMode, referenceMode, vertexIndex)); the line vertexIndex++; needs to be inside the inner for loop.