Hi Claire,
VisualARQ object instances do always use affine transformations, so yes, I think we use the same convention.
But take into account that users can create user blocks, and the matrix on those blocks is not managed by VisualARQ. It is true that users can only modify this matrix using Rhino commands (like Rotate, Move, Scale, Shear, etc), but other plugins may apply a projective transformation on a block, although I don’t know if that is even supported by Rhino.
Regards,
Enric