Bullet Soft Body Source Code / Algorithms?

[pablobullet]

Hello, this is my first post. I'm interested in using bullet in my projects, but I need to know, since I read bullet is Open Source, where I can download the source code and compile it (using Visual Studio 2005). I want to know how the algorithms used in this SDK are implemented, specially the ones for detection for deformable bodies (because I downloaded 2.72 but I only see that some samples can be compiled, but not the bullet code where these algorithms reside).
Thanks in advance.

[ejtttje]

You can get the source from the download page:
http://code.google.com/p/bullet/downloads/list

[pablobullet]

Oh, thank you very much.
By the way, I would like to learn about the algorithms used in bullets (specially the ones for deformable and soft bobies).
Where can I get that information?
Thanks again.

[Erwin Coumans]

You already have the source code for the soft bodies, it is in Bullet/src/BulletSoftBody.

There are many different algorithms implemented, Matthias Müller is a good starting point:
http://www.matthiasmueller.info/realtim ... index.html:

• position based dynamics and impulse based dynamics
  Bullet soft bodies doesn't use a single solver, but a configurable set of position and velocity based solvers)
• optional shape matching

For collision detection:

• dynamic aabb tree that dynamically changes structure, not just a refit of existing tree nodes.
  See Bullet/src/BulletCollision/BroadphaseCollision/btDbvt.cpp
• optional convex cluster collision, a kind of convex decomposition clustering a set of vertices.
  This works better then just colliding with single triangles, edges or vertices.

Müller's Position based dynamics paper can be viewed as a more formal description of Thomas Jakobsen earlier work, see http://www.teknikus.dk/tj/gdc2001.htm
Hope this helps,
Erwin

[pablobullet]

Thank you very much Erwin!, now I can start to learn about these algorithms.!