[ODE] Contact point merging strategy
Jon Watte (ODE)
hplus-ode at mindcontrol.org
Fri Jun 15 13:23:09 MST 2007
Mark Williams wrote:
> Jon Watte (ODE) wrote:
>> Yes, it's that "simple".
>> You may actually want to ignore the similarity of normals, or allow
>> for a big slop, depending on your intended result;
> Under what circumstances might you want to ignore the similarity of the
For example, if a ball hits an edge of a trimesh box, you will get two
normals: one from the edge normal to one face, and one from the edge
normal to the other edge. Averaging these two normals into a single
normal will usually give you good results, and put less strain on the
constraint solver (because the two normals may generate very different
>> driving over a "flat" trimesh with a ball can be pretty bouncy unless
>> you filter pretty aggressively based on contact proximity. You do want
>> to average all the normals you filter out per geometric point, though.
> Is it good enough to do a component-wise arithmetic average of the
> normals followed by a renormalisation in your experience?
In my experience, yes.
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