Problem: After a rotation matrix was applied to an object, the corner about
which is was supposed to rotate wandered away from position.
Solution: I kept a record of the position of the corner within the clip. I
applied the matrix to a copy of that corner point to find where it would
transform to. I compared that to where the clip said the corner was. Using
the difference, I pushed the clip to get the corner point back into
position.
John
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