Real-Time Physics Simulation Forum

Hi, This might sound like a stupid question... In the case one decides to use the btMultiBodyDynamicsWorld class, I assume it is not possible to use soft bodies anymore, is that correct ? Also, I assume it's not possible to use multibodies along with btSoftRigidDynamicsWorld, meaning multibodies and...

Hi, I'm encountering an issue with Bullet internals, and I'm not sure what the best way to resolve it. Basically, the issue is related to the collision between a rope (softbody) and a terrain, for which I've derived a class from btConcaveShape, overriding processAllTriangles() etc. This derived clas...

Hi, This might sound like a terrible question, but I'm not fully sure of the answer. The compound shape constructor has a "enableDynamicAabbTree" parameter. That tree is used to accelerate early rejection. In the case all shapes added to a compound shape are static (i.e. not moving), does ...

Modifying the normal indeed improves the situation significantly. I still have some rare jittering cases, no idea why really. But it's acceptable.

Looking at the implementation of btAdjustInternalEdgeContacts(), it seems there is a little bit of additional work being done there :/

I'll have a try, thanks !

Hi Danny,

some time later May I ask you, how have you managed to modify the contact point normal manually ? I couldn't find how to achieve that...

Hi, I am currently struggling trying to avoid collision being detected between a convex hull decomposition shape and my terrain (custom shape derived from btConcaveShape). The issue is pretty intense when using small triangles, as seen in that video: https://youtu.be/MWw1ywZUsrI When using bigger tr...

good news, I should admit I am quite reluctent on depending on a file format we don't have control over...

thanks for your answer !!

OK great, I also discover the scaled bvh, which perfectly suits our needs since we have some random scaling variation of instances.

Thanks for your answer !

The video is looking good, have you finally based your solution on the suggested btConcaveShape-derived class option ?

Hi, imagine the following case: HW instancing is being used in order to render 10 instances of the same street light 3D model (i.e. one mesh being rendered 10 times). Is there a way to create one single btBvhTriangleMeshShape object, and reuse it across the different instances (of course with a diff...

OK this sounds like a sensible approach. I will have a closer look at Bullet internal serialization code (assuming you suggest using that system for serialization). Can I assume some kind of stability of that serialization format within the next years, or shall I expect it to potentially change with...

Hi guys We have a huge world (full earth), we are streaming/paging (in/out) some 3D models (think buildings here). We want to allow them to have a collision mesh (basically a btBvhTriangleMeshShape per streamable chunk). So, we also have to stream the collision mesh; they will be added/removed to th...

I have fixed the bug. See https://github.com/bulletphysics/bullet3/pull/277 for details.

I have got the exact same issue here. I am currently trying to figure out what happens.

It seems to happen with a specific mesh only...