Real-Time Physics Simulation Forum

I found that line in source code

///solve contact and other joint constraints
solveConstraints(getSolverInfo());


So solveConstraints also solves contacts

It uses springs model and simulate every 1/60 second.
So some time it compress springs to hard and it jumps.

There is no simple remedy if you wish to use vehicle that comes with bullet.

On high speed your car may fly throw ground or wall also.

I wish to control directions where rigidBodies go after collision. How do I do that? I have already set btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK flag for some rigidBodies and defined void myContactAddedCallback(btManifoldPoint& cp, const btCollisionObject* colObj0,int partId0,int index0,co...

GWT compiles Java to JavaScript. You could probably compile Java bullet port to javascript.

There is JavaScript port of Quake II already made by google

Quake -> Jake (java port) -> gwt compilation with WeGL -> Chrome with WebGL
http://code.google.com/p/quake2-gwt-port/

There are severals ways described in manual. Groups are simplest way and you can define your own class that will do that. You will have to override btCollisionWorld::ConvexResultCallback or btCollisionWorld::RayResultCallback They are already overridden in btCollisionWorld. You may copy, rename, mod...

Check bullet manual

Chapter 6 Collision Filtering page 20

I have unanswered topic about triangle mesh.
It does not work for me. Try to use convex instead.

Raycast vehicle simulates springs and will jump.

I have some progress implementing

btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK

I wish to play sounds when things impacts.

How do I hook it?

I can detect when object velocity changes significantly but I think there must be a better way to do that.

Cheers

You'll find you need to use a btGimpactTriangleMeshShape if you really want moving triangle mesh. Most games simplify triangle meshes, as the decision tree shows. Thank you very much! But I can not find btGimpactTriangleMeshShape in bullet-2.7.4. Do you mean btGimpactMeshShape? I can't find btGimpa...

I have triangle mesh for moving body and I have to use btGImpactTriangleMeshShape but I can't find it.
I use bullet 2.74

Should I use different class?

I was googling and I have not found much information on btGImpactTriangleMeshShape.

Please, advise

Thanks

Things that have small mass fall as fast as heavy. In free-falling due to gravity, yes you are correct. But in your case you have to rotate the object in order to fall off the edge of something. It is more difficult to rotate a massive object, not to mention that the moments of inertia go up with t...

Thanks but it will make my object fly 2 time faster only. If I wish to make it really fast then I will have to implement a following hack. When objects will move fast (one step distance larger then 20% of object size) then class implementing btActionInterface will check check collision for next step...

Things that have small mass fall as fast as heavy.
I set mass to 1 and there is no difference in bullet as well.
May be size make thing fall slower.
But it is unrealistically slow. when gravity is 10 and I set gravity 20 now.

May be bullet has some tuning or I should change some constant.

Is it possible to set some flag to make bullet verify if there is anything between old potion and new position of rigidBody and avoid situation when fast moving body fly throw ground or wall.

Cheers