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If I make multiple draw calls for various Program3D instances, is there a way that I can reset or nullify the constants if I’m no longer using them in the next following Program3D assignment?
Is it even necessary that I do something like this?
//Nullify 'vc0' in the vertex shader:
context3D.setProgramConstantsFromVector("vertex", 0, null);
No, constants are global state to the entire Context3D. Their content does not change if you change programs. The default value is (0,0,0,0), but if you do not use them in a program there is no reason to set them.