Real-Time Physics Simulation Forum

This causes both the rigid bodies to rotate. Is there a way just to drive the second rigid body with the motor while remaining connected to the first? If the first object can't be static, then the only other solution I can think about is playing with the masses and/or local inertias of the two bodi...

It might be an "update AABB" problem. I'd try to solve the problem this way: By NOT using btCompoundShape for static objects in the first place. Just add the child shapes directly to the world as static btRigidBodies (or plain btCollisionObjects if you like). Some tests I made some time ag...

I saw this V-HACD and read how to include it [...] I'm using the last version 2 from github. Then you can't use appHACDDemo tool in the first place, because I wrote: First: this "Tool/Demo" is rather old and won't work with the current "git" version of VHACD-2: I've just added a...

I'm just a beginner, so this may seem a little stupid but I couldn't set up the load .bcs method. First: this "Tool/Demo" is rather old and won't work with the current "git" version of VHACD-2: I've just added a note in the first post. I suppose you use the plain HACD version. I...

First, sorry, I've just read the post title (= not its content). Second, this link is rather old, but it might still work (expecially the ghost object demo included in it): please tell me if it's useful for you or not: http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=6195&hili...

The reason i believe trigngle mesh is expensive is that if i use it, the aabb of arena will intersect with every single aabb in this arena, bullet will test the arena with every dynamic rigid body in every step(i'm not 100% sure), the test includes every face in triangle mesh(i guess), that must be...

I believe it's too expensive to use Triangle mesh. It that's a static wide geometry, I don't think it's too expensive at all: you can try and see :) . However I agree that usually convex hulls behave better that btBvhTriangleMeshes: in that case you can use vhacd, as suggested by drleviathan, or ju...

I've updated RBD's Blender addon to support VHACD version 2.2. Here it is: object_vhacd.py.zip P.S. My knowledge of python is minimal and I tested the plugin on Ubuntu only. Hope it works on other systems as well. P.S.2 There's a visual artifact in the GUI when loading presets: the GUI does not upda...

About schedule(static, 50) : This is how OpenMP partitions the threads: 50 should mean that each thread takes 50 operations at a time. static means that the partition is made ahead of time (less time to partition, but some threads may end up early and have nothing left to do). Alternatives are dynam...

Hehe :) ... Lines like that are commonly used in C++ to remove possible compilation warnings caused by the fact that a method parameter is never used inside the method's scope. I don't know if that's the case here: many times programmers start adding those lines, then they actually use those variabl...

:D ! Just to say I'm very happy I can use callbacks and the OpenMP version! Only one additional thing: On Linux 64bit in LinearMath/btThreads.cpp , I had to change: bool btIsAligned( const void* ptr, unsigned int alignment ) { btAssert( ( alignment & ( alignment - 1 ) ) == 0 ); // alignment shou...

I don't usually like to pop-in and interrupt an ongoing discussion: however I'd like to make a few brief questions/considerations, soon after having thanked lunkhound for having restored/rewritten/reconsidered/reforked the Bullet Multithreaded branch :) . Here are my questions/considerations (I stil...

Using a custom material callback you can override friction on a compound child basis. I don't remember the details ATM, but AFAIR the introduction of the btCollisionObjectWrapper class into Bullet was done to extend this possibility to handle nested compound children too. However I'd stick to the pa...

@RBD: Thanks for posting it :) ! P.S. On Linux 64bit and Blender 2.72b (and maybe on other POSIX systems), I had to change: vhacd_process = Popen(cmd_line, bufsize=-1) to vhacd_process = Popen(cmd_line, bufsize=-1, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=Tr...

Thank you for your exhaustive answers ! .