 | | | soft body cluster and cluster center | soft body cluster and cluster center 2005-04-30 - By Robert Moodie
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[rob] see below
I've spent very little time with soft body dynamics in XSI so please
excuse me if this is a bit of a simple solution in the end.
I'm experimenting with ways to make my simplePolyMuscle construct, do
the jiggling muscle thing. I have a few ideas but I decided to explore
the softbody solution first.
So I grabbed the verticies that make up the center mass of the muscle
and turned them into a softbody (leaving the ends of the muscle as
normal animated geometry). And I threw the waterballoon preset on the
softbody to get started.
My muscle geometry animates via three cluster center ops in the
animation part of the stack. So since I want the simulation to inheret
that animation, I moved the sofbodyop after the cluster center ops in
the stack.
[rob] what do these do?
The problem however, is that the op seems to want to override my cluster
center animation completely (on the whole mesh, not just the verts that
are part of the softbody). It looks like its reading an initial state
from the modeling stack or something. So the muscle just sits there in
its initial pose and runs the simulation on top. It doesn't take the
cluster center animation into account at all. It overwrites the
verticies with the initial position from the modeling stack (I think).
[rob] Yes, the soft body op overrides the cluster centre animation. Off-hand I
don�t know �exactly� why.
I've tried the various options on the "Dynamics" tab of the sofbody op
to little positive effect. I've also tried moving the softbodyop to
different places in the stack. But I can't seem to get it to ackowledge
the vertex animation created by the cluster center ops.
[rob] these relate to object animation via SRT, not cluster centres.
Is this a limitation of softbodies? Should I be looking for a simple
solution that I'm unaware of?
[rob] Is what a limitation?
Should I TD this to death with a complex workaround?
[rob] Move the cluster centre ops after the soft body op.
Thanks,
-brad
p.s. as stated, this is not my only potential solution to jiggly
muscles. So if it turns out this just wont work, I have other options.
no worries.
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