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POHow can I make my physics object settle down?
 

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  1. POHow can I make my physics object settle down?
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    <p>I'm using BulletSharp, a C# distribution of the bullet library. I have been getting some bouncing in an object that supposedly has Restitution of 0.0f.</p> <p>I have one dynamic cylinder (what will be a mesh soon) falling to rest on two static cylinders. Like so: </p> <p><img src="https://i.stack.imgur.com/0YCH3.png" alt="starting object positions"></p> <p>The cylinder on top often bounces around wildly, usually bouncing off to the side.</p> <p>Here's the code I'm using to set up the scene:</p> <pre><code> //now figure out bulletsharp stuff... CollisionConfiguration collConfig = new DefaultCollisionConfiguration(); Dispatcher collDispatch = new CollisionDispatcher(collConfig); BroadphaseInterface broadphase = new DbvtBroadphase(); ConstraintSolver sol = new SequentialImpulseConstraintSolver(); world = new DiscreteDynamicsWorld(collDispatch, broadphase, sol, collConfig); world.Gravity = new Vector3(0.0f, -10.0f, 0.0f); //log (moving object) MotionState still = new DefaultMotionState(); CylinderShape shape = new CylinderShapeZ(0.5f, 1.0f, 1.0f); still.WorldTransform = Matrix.Translation(0.0f, 0.4f, 0.0f); RigidBodyConstructionInfo constructInfo = new RigidBodyConstructionInfo(1.0f, still, shape); logBody = new RigidBody(constructInfo); logBody.SetDamping(0.04f, 0.1f); world.AddRigidBody(logBody); //rollers (static objects) CylinderShape r1s = new CylinderShapeZ(0.1f, 1.0f, 1.0f); MotionState r1m = new DefaultMotionState(); r1m.WorldTransform = Matrix.Translation(-0.2f, -0.4f, 0.0f); RigidBodyConstructionInfo r1ci = new RigidBodyConstructionInfo(0.0f, r1m, r1s); r1 = new RigidBody(r1ci); world.AddRigidBody(r1); CylinderShape r2s = new CylinderShapeZ(0.1f, 1.0f, 1.0f); MotionState r2m = new DefaultMotionState(); r2m.WorldTransform = Matrix.Translation(0.2f, -0.4f, 0.0f); RigidBodyConstructionInfo r2ci = new RigidBodyConstructionInfo(0.0f, r2m, r2s); r2 = new RigidBody(r2ci); world.AddRigidBody(r2); </code></pre> <p>And every frame I use <code>world.StepSimulation(0.05f, 100, 0.0005f);</code> to update the physics simulation.</p> <p>Am I missing any obvious settings? Why is my simulation doing this?</p> <p>Small update: I have successfully made a similar simulation in Blender's Bullet stuff. There was no bouncing there... I don't know what difference there might be between that and this.</p>
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    1. COCan you add restitution to the falling object?
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    2. COAdding restitution to only the falling object didn't make any appreciable difference. Setting restitution to 0.1 for all three objects seemed to settle it down a bit, but depending on the simulation step size. There was still a bit of bouncing, occasionally bouncing off.
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