Houdini: Extracting Transforms

When you get an animated sequence, and want an object to match that animation (note: In this case we are talking about rigid animation, not deforming characters), sometimes you need to fuss with positions and orientations. One way is to extract the transforms between the rest and target positions, and the difference can be used on other objects which then move the same way as the target positions.

Actually, extracting transforms may not be the best term, but that's what's stuck in my head...

The solution is from the Matrix and Quaternion FAQ, Q40.

And the hipfile can be downloaded from the forums: http://forums.odforce.net/topic/7223-extracting-relative-transforms/page-2