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Animation help

Started by NoOsEnCe Mar 17, 2005 at 2:06 AM 0 replies 500+ views

Original Post

Mar 17, 2005 at 2:06 AM

I know how to skeletal animation fine, i am having troubles because i am wondering how in some animations it looks like they actually stretch polygon faces. Because how i am doing it you "put" one polygon inside of the other sort of overlap them so that when they bend they dont have a clear space between them. How the do they accomplish this "stretching"?

Kalidor

Mar 17, 2005 at 8:41 AM

Make it so that each vertex can be affected by more than one bone with different weights (adding up to 1.0). So let's say you have a vertex near a character's elbow. It could be affected 60% by the upper arm bone, and 40% by the forearm bone. So you multiply the vertex by each of the bone's weighted matrices (0.6*upperArmMatrix and 0.4*foreArmMatrix).

This is usually called 'vertex blending' or 'smooth skinning,' google for those and you should get much more detailed explanations.

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