EDIT:

Surface constrain the nulls to the NURBS surface, not to the control points.  
This would allow you to drive the orientation of the nulls as well as 
translation.

Should be able to do the same trick with a low resolution polygon mesh as the 
simulated surface if NURBS doesn't work.

Matt



From: [email protected] 
[mailto:[email protected]] On Behalf Of Matt Lind
Sent: Thursday, December 06, 2012 7:47 PM
To: [email protected]
Subject: RE: transferring low res syflex to high res geo

I wrote an article on this technique many years ago for HDRI 3D magazine:

Assuming Syflex works on NURBS surfaces and your cloth is a planar polygon mesh 
deformed with wrinkles and whatever.  I would surface constrain the mesh to a 
NURBS surface of similar size/shape, and run Syflex on the NURBS surface.  When 
you're testing the simulation, you can hide the mesh to get the performance.  
When the simulation is to your liking, unhide the mesh to check the results.  
When you have something you really like, you can optionally plot the results as 
shape animation onto the polygon mesh.

If you prefer, you can also plot out as envelope animation by making a bunch of 
nulls to act as deformers of your polygon mesh, and then constrain them to the 
control points of the NURBS surface.  Plot transforms for the nulls whenever 
you feel the results are to your liking.  If you want multiple 'takes' to 
choose from, you can plot to a mixer source instead of directly to the 
Transform parameters as FCurves.  You can then play with the mixer sources to 
further massage into a result you like.

This would give you a lot of freedom and quick iteration.

Matt

PS - if Syflex doesn't work for NURBS, you can use a low res mesh as the 
working copy.




From: 
[email protected]<mailto:[email protected]>
 [mailto:[email protected]] On Behalf Of Kris Rivel
Sent: Thursday, December 06, 2012 6:59 PM
To: Softimage List
Subject: transferring low res syflex to high res geo

I'm curious how others handle layered or very high res geo clothing?  I have a 
pretty high res geo of layered clothing on a character.  I'm getting some 
decent results with just applying syflex to the geo, enabling self collision, 
boosting the subframe steps, etc. and letting 'er rip but its pretty slow.  I 
get fantastic results using one, lower res proxy mesh.  Whats the best way to 
transfer or copy a low res sim to a high res mesh?  I was creating nulls on 
each point on the lower res geo and enveloping the high res too it but now I'm 
dealing with managing almost 2k worth of nulls and any envelope corrections are 
impossible.  Any other suggestions other than brute force?

Kris

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