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piker
04-15-2002, 03:46 PM
I am trying to model a square piece of balloon using bezier surfaces. Does anyone have any good ideas on how to accomplish this? I have been trying to look at the physics for awhile now and havent come up with much. Any help would be appreciated.

sz
04-16-2002, 03:55 AM
Hello,
as i understood, you want to make from small peace of ballon (that small peace will be consequently, a square) courved surface, with Bezier offcourse.
Well, there is known 4 vertices, and tesselate them (as much triangles it there, sourf will be smoother http://www.opengl.org/discussion_boards/ubb/wink.gif ). There is few nice codes on the net, i can't remember now, but Google is solution http://www.opengl.org/discussion_boards/ubb/wink.gif

harryx
04-16-2002, 04:42 AM
If I understand the question, what you want is a square patch of elastic (balloon) material.

Id recommend forgetting about bezier surfaces as they are irrelevant to the problem, for now you should make a polygonal grid and work the physics out for that.

Once this is working you may want to then use a lower resolution grid and use the vertices as control points for a bezier surface.

harsman
04-16-2002, 06:08 AM
Search google for "cloth simulation" or try these links:
http://www.ioi.dk/Homepages/tj/publications/gdc2001.htm
http://www.darwin3d.com/gdm1999.htm
http://www.cs.cmu.edu/~baraff/sigcourse/index.html