Physics Simulation Forum

Hello,

could pls someone post here an article, which describes best the method used in Bullet's soft body dynamics?
Thanks in advance.

Hello strangelet,

The soft body model is based on mass-spring system.

This paper may be helpfull: http://sites.google.com/site/chiwa737/d ... lation.pdf

Hello

Are there any more detailed papers about the methods and optimizations that are used in Bullet? The Siggraph 2010 BOF presentation, "Rendering The Breeze" (http://www.khronos.org/assets/uploads/d ... -Jul10.pdf , 4.1 MB PDF file), describes one of the methods that seem to be implemented in Bullet. As far as I could see from the source code, the computation of the "independent subsets of links through graph coloring" is implemented in the OpenCL soft body solver. Is this method described in another paper/publication? Are there any further optimizations to this? E.g. concerning the cache efficiency of the resulting structures, which is occasionally mentioned in the source code, but seems not to be treated explicitly.

Thanks in advance
Marco

After inspecting the code and searching on the web I think that Bullet is based on heuristic position based dynamics, which is described here: http://www.matthiasmueller.info/publica ... sedDyn.pdf
not mass spring model.
I think that Bullet uses only position constraint between nodes and iterative correction of that constraint (equations 10 and 11 in added paper), which is implemented in btSoftBody::PSolve_Links method
am I wrong?