Real-Time Physics Simulation Forum

I'm not an Python or a Blender expert at all, so I don't know what's going on (maybe it's something I've messed up myself). However following your instructions (python setup.py install --install-lib=~/.config/blender/2.71/scripts/addons/), everything seems to work, until I try to enable the addon in...

I think that's just a matter of conventions. I've read on some other forum some time ago that the "correct" way to map all the bodies in OpenGL should be with Y up and -Z forward, since this convention can be used for both the camera and the other objects. I don't remember what convention ...

The Bullet official character demo loads a a level (.bsp extension as far as I remember) and converts it to a series of btConvexHullShapes. I don't know why you can't run it, but this is not very important as far as I can understand, since you're using a btBvhTriangleMeshShape as a background (this ...

I want to apply a specific force to just one of the child shapes. Is that possible? Nope, compound shapes have been designed mainly to simulate moving concave bodies (and they're commonly used to shift the rigid bodies' center of mass too). Some people use them to attach/detach child shapes at runt...

The collision that occurs looks good, but the problem is that I am still having 100 different contact pairs passed for two compound objects colliding. Having your physics solver do 100 contacts for a single shape is a pretty hefty price in performance, which is my main concern. Yes, I know, using c...

Is there no built-in bullet method to prevent btCompoundShapes ConvexChildren from interacting with each other in such a manner? Are there any well known ways of dealing with filtering contact points? First of all, I've used compounds of convex hull shapes quite frequently in the past, and I never ...

I don't get the point of setting an identity matrix as the object transform. I am doing something wrong in my code? btQuaternion(0.f, 0.f, 0.f, 0.f) doesn't seem to be a normalized unit quaternion. I would have used something like: collisionObject->setWorldTransform(btTransform(btMatrix3x3::getIden...

New issue -- Maybe the damping was there for a reason? Now my model quickly gains energy and spins out of control. It seems that the damping was a hack to keep things stable. Any ideas about a real fix that doesn't involve arbitrary damping? Well, I don't have enough experience with the Featherston...

GripInc wrote:collisionObject->setWorldTransform(btTransform(btQuaternion(0.f, 0.f, 0.f, 0.f), btVector3(100.f,0.f,0.f)));

What world transform is this ? Maybe you should use btMatrix3x3::getIdentity() as the transform basis.

Well, I've never used that class so far, and m_linearDamping and m_angularDamping seem to be private. However there are some accessors: btScalar getLinearDamping() const { return m_linearDamping; } void setLinearDamping( btScalar damp) { m_linearDamping = damp; } btScalar getAngularDamping() const {...

I purpose stopped the Loco, because at higher speed you can't see the wheels how good turning. ;-) Good to know, so everything seems to work as expected :) . Furthermore, if you're using the default btRaycastVechicle, that means that 'ray-wheels' with different directions are working nice, and this...

When I add a wheel to the Vehicle, why is important it is a frontwheel or not? This is not so obvious by trains. Well, I've not been using btRaycastVehicles for some time, but as far as I can remember the wheels marked as 'front' are the ones that can be used for steering the vehicle. I don't know ...

Adding orthogonal ray tests to trap the train onto the track is an interesting approach indeed . Thanks for sharing the details !

You might need to call body->activate() before setting the linear velocity, or you can just forget about it, by setting the DISABLE_DEACTIVATION state.

now what I do is join all the meshes (with a tool), export the obj, import it to Blender and then export the .bullet to load it later with the Bullet worldimporter. So, I think the only solution to my problem is to reduce the resolution of the mesh (.obj) by removing inner geometry, using the modif...