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Strob
03-21-2006, 09:15 PM
I'm trying to do something that would be very easy to do in 3ds max, but I can't find a way to do it in XSI...

I want to simulate the motion of the wind in a parachute when the parachute is opening. So I want a lot of giggle at the top but no motion at the attach point like on this picture:

http://www.strob.net/cgtalk/parachute.jpg

In max I can just put on noise on a soft selection on my rope and fabric and then i animate the noise gizmo in Z translation.

In XSI I would like to use a randomize on a lattice, animate he lattice in Z and deform my ropes and fabric by this lattice with a weight map, but we can not use a weight map cause the lattice deformer has no amplitude... I want a lattice cause I want to control the scale of the noise. If I apply a randomize or shape jitter directly, the noise is too small and also the diameter or the rope become streched dramaticaly.

Deform by spine or deform by surface don't have amplitude, so there is no weight mapping possible...

I tried using a shrink wrap (which has an amplitude) but the vertex are kind of jumping in the air, the deformation is not smooth when animated...

So is there an XSI master here?
Strob
03-21-2006, 09:43 PM
Ok someone just gave me an answer about that...

The solution is to use shape animation on which we can use weight map!!! I animate a full giggling version of my parachute, then I create a shape animation using a non animated parachute pointing to the animated one as an animated shape. Then I create a weight map on the last one. Then I select the cluster corresponding to the shape and I use "modulate shape key with weight map" in the deform=>shape menu and i pick the weight map.
Sbowling
03-22-2006, 03:48 AM
Thanks for sharing the solution to that problem. Sounds like it may come in handy on some work I'm doing.
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03-22-2006, 03:48 AM
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