View Full Version : Weight morphing?
Has anyone ever tried to morph between two or more weight envelopes? For example, you could have two envelopes on a character, one where the arm works when outstretched, and one when it is at the character's side. Then you script the envelopes to morph as the arm rotates. Instead of using a geometry morph, you could use a weight morph. Has this ever been tried? Is it even possible in XSI? I was able to set up multiple envelopes on a character using clusters, but can't figure out how I would morph blend between them. Is this a stupid idea?
05-19-2006, 01:40 AM
No it's not a stupid idea, and no, it's not possible out of the box.
It's not particularly hard to write as a tool (I know, I have it in my toolbox :p ), but the solution isn't as trivial as you might expect when you work with weights.
A trivial but expensive solution is having two meshes deformed by the same deformers but with different weightmaps, and biasing a third between the two (or more), which is a simple vectors averaging, but it can be fairly dataheavy as you can imagine.
The alternative solution, of working weights-side, while not being anything phenomenally hard, isn't as simple as it may sound. The example you're thinking of is probably just a few bones and all points are already weighted to those bones and only need shuffling, but blending between very different sets of deformers can turn out unpredictable very soon.
I know it took me a while to get something that would average satisfingly for more then just an arm bend, and it's not particularly snappy.
Thanks Raffaele. Your reply was vey helpful. It's good to know that I'm not crazy for having the idea in the first place.
05-19-2006, 02:13 AM
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