Raytest collision performance

[Honya2000]

Hello,

In my engine i used very simple mesh collision detection library coldet for quite long time.
But today i decided to switch to Bullet collisions because particle effects aren't fast with coldet.

I'm using Bullet the same way as coldet. Create triangle mesh shape (from indexed mesh), add it to physics world and then perform btCollisionWorld::rayTest for each particle.

Quite surprized that with bullet physics collision detection is about 6 times slower. With coldet i get 60 fps with rain particles effect. Bullet physics gives just 10 fps.

I expected much better performance, as coldet is very old. And bullet lib looks much more advanced...
SSE is enabled. I even tried to enable BT_USE_SSE_IN_API. But got even worse performance.

Any tricks to improve the speed ?

[Honya2000]

Btw if i create triangle mesh shape without quantization:
auto collisionShape = new btBvhTriangleMeshShape(triangleMesh.get(), false, true);

The performance of collision detection is ten times faster (faster than colDet), but not accurate. Very often rayCast picks wrong surface (Quantized mode is always accurate).

So looks like there are some bugs in the collision library. Will try to update to new version...