MeshMatcapMaterial matcap texture offset and matrix transformation

is this feature supported?
material.matcap is a texture, but setting the matrix, rotation or offset doesn’t seem to effect the scene
testing with this scene:


The sampling of a mat cap does not rely on texture coordinates. Hence, changing the uv transformation has no effect.

FYI: The uv value for mat caps is computed like so:

thx for the info @Mugen87. I was afraid.
so custom shader is the way.