Real-Time Physics Simulation Forum

Thanks. I ended up just using a linear drag function, specifically there's a good implementation in Game Programming Gems 6 (Can be borrowed for free on archive.org). Seems to be alot more stable. Also I should add, the sphere approximation is actually really bad :cry:, unless your shape is already ...

Yeah I thought the AABB approximation might have too much error so I tried it with a sphere instead, using the volume of the sphere cap cut off by the water plane. I'm gonna double check my math on that once I get a chance but it's also presenting the same issue. Things are very unstable, so i suspe...

So I'm trying to simulate buoyancy (and drag) by calculating and applying it's force every step. But I'm having some issues, I seem to be getting things exploding and bouncing everywhere when they hit the water (fluid_box in the code below). I'm approximating the displaced fluid using the AABB inter...

So I have an object that I need to represent that is roughly ellipsoidal, basically a squashed sphere. Can I simply make this with a btSphereShape and setting the local scaling? or are there drawbacks with this approach? Since bullet doesn't seem to come out of the box with an ellipsoid shape, what ...

I wrote some code to create an explosion and I seem to be having some trouble with it. When it is used it causes the game to crash. I assumed this was because I was trying to upcast a btRigidBody from a btCollsionObject that didn't have one. I check to see if the object is static or not but maybe th...

I use this tool with a lowpoly obj file:
http://bulletphysics.org/Bullet/phpBB3/ ... php?t=7159

then I load the resulting .bcs file as my collision shape

according to here: http://code.google.com/p/bullet/source/detail?r=1457 bullet should support collisions between btKinematicCharacterController and dynamic objects however when my character comes into contact with dynamic objects it does one of two things: 1. goes right through the object 2. walks o...

I have recently determined that a large performance bottleneck in my game is physics. Right now I run bullet without any parallelization. I tried using btParallelConstraintSolver but weird things happened such as my character not slowing down and objects not making contact. Is there more work requir...

I just realized when I was trying to use setAngularVelocity that it took its input as a Yaw Pitch Roll vector (I thinks that what it corresponds to). I was just wondering why setAngularVelocity did not have an overload using a quaternion which would make sense in many cases?

I would recommend doing physics on the server side it would simplify things allot and stop slower computers from affecting the game speed. If your multiplayer isn't server based then I would choose one player to "Host" the game and the physics would be done on their computer. The inputs fr...

Hi I'm using a rigid body as my character (not the kinematic character controller). I'm having an issue where when my player is moving up small inclines such as rough terrain (less than 0.5m) they experience deceleration when they shoud just walk over a small bump, I'm moving the character using set...

Hi I'm writing a game using bullet and I'm having trouble testing whether or not my character should be able to jump. The character should only be able to jump If they are standing on something so I decided to cast a ray downward and if that ray hits something then they will jump. But here is my pro...