List of hit triangles

[Spaddlewit]

I've got a sphere and a triangle mesh.
When the sphere hits the triangle mesh, I want to obtain a list of the triangles that were hit. Is this possible? Do I do this in a custom narrowphase callback? If so, how? I already have the narrowphase callback working, I just need to know how to get the triangles.

[pico]

It would be great if bullet could provide/generate a list of clipped triangles for a convex cast. In this way geometric decals could be generated with Bullet.

[Erwin Coumans]

I've got a sphere and a triangle mesh.
When the sphere hits the triangle mesh, I want to obtain a list of the triangles that were hit. Is this possible?

You can use the btConcaveShape::processAllTriangles method, and pass in a triangle callback and a axis aligned bounding box (AABB). The triangle callback will be called for each triangle of the mesh that has AABB overlap.

Hope this helps,
Erwin

It would be great if bullet could provide/generate a list of clipped triangles for a convex cast. In this way geometric decals could be generated with Bullet.

Good idea. Please file a feature request in the issue tracker, before it gets lost deep in the forum.

[pico]

Hi Erwin,

feature request has been added:

http://code.google.com/p/bullet/issues/detail?id=272

Thanks for taking care!