James Kirk

If you just wanted a blendshape-style mix based on color, you could paint your weights, perform the transform to put the entire mesh into the fully-transformed target position, and then wire this into a Wrangle with the un-transformed mesh plugged into the second input. The Wrangle's VEX code would just be this:

If you wanted to have blended rotations, you would have to do things slightly differently, perhaps by specifying a rotation, converting to a quaternion, interpolating using the slerp() function, and then rotating the point by the resulting quaternion. Depending on your overall goal, that might be overkill, though.

-James

Did you make sure your Geo Time Samples on your ROP are set to 2 and “Allow Motion Blur” is checked on? If you're using a RenderMan Archive ROP, I believe you have to add those params manually.

-James

Thanks, Graham! I was trying to avoid doing something like this, but it seems it can't be helped, and upon reflection, it's really not that bad. It's just mimicking, in Python, what Houdini does at startup. Thank you for the code; I'll give it a go.