This has been discused in several posts but not clear how can be done.
How can I get a IDirect3DVertexShader9 valid pointer from an instatiated ID3DXEffect ?
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Posted 20 July 2014 - 07:18 PM
Call GetVertexShader? Presumably you need to provide a handle to a pass (GetPass/GetPassByName), though the documentation doesn't really bother to say.