@shvrdavid, that's pretty much my experience. I'm really looking at the situation where joint movement starts with a nearly linear muscle flexion until the joint gets to a point where a nearby bone starts to influence the shape, and things need to be non-linear, or even start introducing additional bulge. Even cases where the muscle shape change starts to reverse as other muscles take over the joint movement.

I know that a significant proportion of JCM effects could probably be replaced with additional ghost bones and weight mappings, but then that seems it's additional complexity for no necessary gain that couldn't be delivered by non-linear JCMs, since the valueOperations controlling the JCM can just as easily control a ghost bone and it's dependent weight maps.

I suppose it would be nice if there was a definitive report on what the performance overheads of the two systems are, if any. Something that's almost impossible to measure without hooks into the Poser source code. I know that the joint bending process has the ability to multi-thread. I assume this applies equally to weight maps and morphs.

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