btStridingMeshInterface example with mesh sharing

[ngaloppo]

Is there an example of class implementation of the btStridingMeshInterface that actually uses the concept of mesh sharing (graphics/physics/collision) in bullet? Specifically, I'm looking for an example on how to point the collision engine to specific OpenGL buffers on the GPU that can be changed by the user and/or physics engine, while the Bullet collision engine always uses the latest state of that buffer (e.g. just a triangle mesh).

Thanks!

--nico

[Erwin Coumans]

Is there an example of class implementation of the btStridingMeshInterface that actually uses the concept of mesh sharing (graphics/physics/collision) in bullet? Specifically, I'm looking for an example on how to point the collision engine to specific OpenGL buffers on the GPU that can be changed by the user and/or physics engine, while the Bullet collision engine always uses the latest state of that buffer (e.g. just a triangle mesh).

Thanks!

--nico

The mesh sharing can happen between physics engine, and graphics mesh in main memory.

See the Demos/VehicleDemo how to share existing index/vertex array from main memory (potentially graphics data).

If you really need GPU vertex data, you probably have to unlock/lock the data. In that case, you can implement such interface, by deriving from and implement the GPU -> main memory in getLockedVertexIndexBase (from GPU to main memory) and unLockVertexBase (unlocking, as there is no effect from physics to graphics).

Hope this helps,
Erwin

[ngaloppo]

See the Demos/VehicleDemo how to share existing index/vertex array from main memory (potentially graphics data).

Hope this helps,
Erwin

Thanks! Very useful...

--nico