Thanks Nando & Dan, I did confirm that Dan's script to skew a checkerboard by 1 in x-y works.
I tried to throw my transformation matrix into the Card3D local matrix after that, but the resulting transform is way off - the translations in my input matrix are on the order of 10's of pixels, but it seems like they should be normalized relative to the Tz = -1 in the Card3D local matrix? I tried that too but still was getting nowhere. That aside, I had my eureka moment and found a simpler and (to my mind) cleaner solution. Here it is for reference: We had established that the CornerPin2D would be the way to go if I was using >= 6.3. I looked again in 6.2 and realized that even in 6.2 the CornerPin2D node creates a transform matrix under the hood using the 8 input points. I already have the transform matrix, so I tried transforming the 'to' points of the CornerPin by my input matrix to try and force the creation of the matrix under the hood. It works like a charm. Thanks again for the pointer to the CornerPin and other suggestions. Best, Bruce
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