Real-Time Physics Simulation Forum

Bullet supports continuous collision detection (CCD). It uses a small sphere to do a sweep between the steps, and then collides the real body. A brief wiki page provides some hints on how to use it. I tried this but it still is far from a fool proof method. At higher velocities RigidBodys can still...

I think maybe it had to do with collision flags changing this playerGhostObject.setCollisionFlags(CollisionFlags.NO_CONTACT_RESPONSE); to this playerGhostObject.setCollisionFlags(playerGhostObject.getCollisionFlags() | CollisionFlags.NO_CONTACT_RESPONSE); seemed to help. http://stackoverflow.com/que...

I have a ghost object that goes on a player object to detect collisions. For some reason the ghost object isn't detecting collisions properly even though I set it to have the same transform every tick and the same collision shape . The normal player rigid body hits the ground at his feet but the gho...

Before I ever started I always thought CollisionObjects would have a callback for when they collide with another object. I have trouble believing this doesn't exist. Why doesn't this exists? It would be way better than iterating over everything.

I had an idea for collision detected and was wonder if you have any thoughts about it. Instead of using the current step and looking for overlapping pairs to detect collisions instead use the previous step and this step to check if there are any collisions between the two steps this way detection wo...

I was having a little trouble deciphering your code. Are you doing the ray cast from inside the sphere? Hitting the back side of a surface will not be detected it detects hitting the front facing side of a surface.

You have to make an IndexedMesh so you can make a TriangleIndexVertexArray to load in the geometry. Here is some code I use for jBullet BvhTriangleMeshShape createBvhTriangleMeshShape(){ ByteBuffer triangleIndexBase = BufferUtils.createByteBuffer(templateFaces.length*3*4);//number of triangles * 3 v...

you could put a really long cylinder ghost object in the world and find out what it collides with with its transform you are able to rotate it however you like I can see this along with a distance test might work great. You could calculate the distance the rocket has traveled and the distance the co...

yes this is a tricky thing to do but it can be accomplished with recursion and some cpu time. if you have to find the shortest possible path this will take a long time to compute. but if any old path will do it won't be so bad. maybe this will give you an idea on how to do it Path theAnswer; boolean...

I know this thread is old but I too was searching about this and wanted to note that this is incorrect for the sake of miss information halfExtends = btVector3(height, radius, radius); I don't think you can represent a tunnel with a cylinder, because it looks at the cylinder like a closed mesh... Yo...

From the manual

A collision dispatcher iterates over each pair, searches for a matching collision algorithm based on the types of objects involved and executes the collision algorithm computing contact points.

so I'm guessing btCollisionDispatcher. hope this helped

okay it magically started working ByteBuffer triangleIndexBase = BufferUtils.createByteBuffer(12); ByteBuffer vertexBase = BufferUtils.createByteBuffer(36); IntBuffer triangleIndexBaseIB = triangleIndexBase.asIntBuffer(); FloatBuffer vertexBaseFB = vertexBase.asFloatBuffer(); //triangle triangleInde...

I have literally been trying to get this to work all day. //ground collision shape /*ObjectArrayList<Vector3f> groundPs = new ObjectArrayList<>(); //WORKS groundPs.add(new Vector3f(-100,0,100)); groundPs.add(new Vector3f(-100,0,-100)); groundPs.add(new Vector3f(100,0,-100)); groundPs.add(new Vector3...

I figured out the issue I was dividing my seconds by 1000 making the simulation very slow.

I tried applying the force in an InternalTickCallback and it still didn't work.