Real-Time Physics Simulation Forum

Re: Units issue and collision failures

2011-03-31T16:27:07+00:00

Yeah, but this is about the 3dsmax exporter... They don't export it in the selected units (meters) but in the generic units of 3ds max...

a cube with extents of 0,5 meter in 3dsmax is exported as a cube with extents of 19,... meter in bullet.

Statistics: Posted by Edgard — Thu Mar 31, 2011 4:27 pm

Re: Units issue and collision failures

2011-03-31T14:54:27+00:00

For the collision of btGImpactCollisionShapes I just found out you need to register the algorithm manually:
Code:
btGImpactCollisionAlgorithm::registerAlgorithm((btCollisionDispatcher*)m_dynamicsWorld->getDispatcher());
Still don't know about the Units though...

The discuss about unit is here:
http://bulletphysics.org/Bullet/phpBB3/ ... f=9&t=6498

Statistics: Posted by Xuhai.Tang — Thu Mar 31, 2011 2:54 pm

Re: Units issue and collision failures

2011-03-31T13:42:46+00:00

For the collision of btGImpactCollisionShapes I just found out you need to register the algorithm manually:

Code:

btGImpactCollisionAlgorithm::registerAlgorithm((btCollisionDispatcher*)m_dynamicsWorld->getDispatcher());

Still don't know about the Units though...

Statistics: Posted by Edgard — Thu Mar 31, 2011 1:42 pm

Units issue and collision failures

2011-03-30T14:25:43+00:00

Hi,

I'm pretty new to Bullet, it looks very promising but I encountered some issues while using the 3dsmax exporter based on physx:

* Units:
It seems the 3dsmax exporter doesn't take into account the fact that I've changed the units settings in 3dsmax in meters?
When I load in the bullet files, I'm getting them in a totally different scale in game. Am I doing something wrong here?
a box with extents 0,5 meter in max is like 19,6854 in game.

* Convex shapes
Is it normal that convex shapes can only be 256 polygons/triangles?

* The names of the collision-shapes
They are always the name of the collision shape type: "Box", "Sphere", ... Not the name defined in max.
The rigidbodies don't have any name.

* Collision between dynamic triangle meshes (gimpact)
It seems that I can export "complex" convex shapes (> 256 triangles) with the "Automatic" option.
They get created as btGImpactMeshShapes. These however don't collide with each other... ?

Are these known issues or am I doing something totally wrong?
Thanks for the help

Statistics: Posted by Edgard — Wed Mar 30, 2011 2:25 pm