Real-Time Physics Simulation Forum

The Wavefront loader in BulletSharp demos is very basic. It didn't know how to read faces with 4 vertices. Should be fixed with this commit:
https://code.google.com/p/bulletsharp/s ... tail?r=580

I checked whether issue 711 that was recently fixed had anything to do with it, but it didn't seem to speed things up. The AABB tree of compound shapes is probably not the same as the one in the dynamics world. At least if you add the 20x20x20 boxes individually without the compound shape, then it's...

The effect of USE_MSVC_RUNTIME_LIBRARY_DLL is that in Configuration Properties -> C/C++ -> Code Generation, it sets the Runtime Library option to "Multi-threaded DLL" instead of "Multi-threaded". It does not mean that Bullet is compiled into a DLL. Instead, it produces .lib files...

Perhaps you can apply linear damping to the bodies as they get near to where they need to stick. if(distance > ideal_distance){ house_physical_body->applyCentralImpulse(convert<btVector3>(attract(power))); house_physical_body->setDamping(0, 0); } else { house_physical_body->setDamping(0.5f, 0); } Of...

He's working on the GPU version, which is hosted at github: https://github.com/erwincoumans/experiments

Point2PointConstraint maintains the distance between two anchor points, but the bodies are still free to pivot around those points. A hinge constraint with angles limited to 0 would work, which looks something like this: var j2 = new HingeConstraint( b1, b2, Matrix.Translation( 2, 0, 0 ), Matrix.Tra...

btCylinderShape returns the correct local inertia as of r2235 . With m=1, r=0.25 and h=8: Iy = m * r*r / 2 = 0.25*0.25 / 2 = 0.03125 Ix = Iz = m * (3*r*r + h*h) / 12 = (0.1875 + 64) / 12 = 5.265625 I don't know what the mass is, but I think you should try to increase it, because as Danny said, there...

Hi! If getWorldTransform returned a btTransform, then it would have to allocate memory for holding the return value. Instead, the value is written directly to an existing btTransform to save time and space. So it's just a useful optimization. Note that btTransform is a class, so the parameter is rea...

The mass should be set to 0 to indicate that it is a static object and that gravity doesn't affect it.

You want to include Bullet as unmanaged code:

You can prevent bodies from deactivating with body->setActivationState(DISABLE_DEACTIVATION) or reactivate them with body->setActivationState(ACTIVE_TAG).

By default, bodies are deactivated after being still for some time to speed up the simulation. I don't think it's related to islands.

I'm not sure I fully understand, but here's how I thought of it. The code extracts the body's orientation around each axis (yaw, pitch, roll) and calculates the delta towards the target orientation. The delta is applied as torque (and you probably want to fiddle with this to get the speed right). On...

All the cast really does is that it checks that UserObject is of type MySimClass and then copies the reference, so I doubt that this will be a bottleneck. A performance hit might occur if the types on both sides were not the same and type conversion had to be done. For example, if MySimClass had a b...

Ok, no problem. Here is 2.80 SP1 with the fix. http://bulletsharp.googlecode.com/files ... 80-sp1.zip

It may be related to this issue, which I've just fixed http://code.google.com/p/bulletsharp/is ... tail?id=33

edit: Any chance you can send me the project that fails?