I was trying to link the voxel world with Bullet Physics.
My first approach was to load the extracted meshes to Bullet. This looks nice until I activate the physics on my character.
It becomes so slow that I can't even move.
I thought this would be a problem for bullet. Surely it doesn't test for collision with all meshes, right?
I have a polyvox world of 256x256 with regions of 64x64.

I tried to look in Thermite source code for the physics, since I read somewhere it was using bullet as well, but I wasn't able to find out anything.

Just wondering if this is the right approach? (loading all the meshes into bullet world)

Thanks

I found the problem

First the conclusion:
It's better to have bigger meshes instead of many small ones.

And my problem was that my character capsule was huge and lead to too many contact points.

Great, I'm glad you sorted it. Thermite3D did indeed use Bullet for physics (as seen in the physics tech demo) and it worked nicely... but I didn't need the physics since and it was getting in the way of refactoring the code, so it came out. I do intend to put it back in, but not in the immediate future. If you want to see what I was doing then you'll need the SVN revision from a couple of years ago. Let me know if you want it but can't find it.

I should point out that a better approach may be to perform collision detection directly against the volume, but this is a lot more work and needs some research. I haven't looked into it.