Bullet is a professional, free 3D Game Multiphysics Library that provides state of the art collision detection, soft body and rigid body dynamics.
13
votes
1answer
685 views
What are pros and cons of Voronoi shatter?
I have seen some Voronoi shatter videos on Youtube.
What is your experience with it?
What are the pros and cons in time complexity, resource complexity, implementation difficulty...?
Does it ...
10
votes
4answers
2k views
2D tower defense - A bullet to an enemy
I'm trying to find a good solution for a bullet to hit the enemy. The game is 2D tower defense, the tower is supposed to shoot a bullet and hit the enemy guaranteed.
I tried this solution - ...
7
votes
2answers
1k views
How would I move a character In an RPG with Bullet Physics/Ogre3D?
lately I have been having problems with moving my character in my Ogre3D game. Basically I am moving the character with bullet's RigidBody->translate() function, but when doing so and bumping into ...
7
votes
3answers
742 views
Physics not synchronizing correctly over the network when using Bullet
I'm trying to implement a client/server physics system using Bullet however I'm having problems getting things to sync up.
I've implemented a custom motion state which reads and writes the transform ...
6
votes
3answers
1k views
How do I implement a Bullet Physics CollisionObject that represents my cube like terrain?
I've successfully integrated the Bullet Physics library into my entity/component system. Entities can collide with each other. Now I need to enable them to collide with the terrain, which is finite ...
6
votes
3answers
552 views
Jitter during wall collisions with Bullet Physics: contact/penetration tolerance?
I use the bullet physics engine through Panda3d.
My scene is still very simple, think 'Wolfenstein3d': tile-based, walls are solid cubes.
I expect walls to block the player, and I expect the player ...
6
votes
0answers
104 views
How to extend the btCollisionAlgorithm class in order to enable collision response with a terrain map created from voxels
I am using Bullet, and am attempting to make a collision algorithm that generates contact points off of a voxel (cube) based terrain, and creates the appropriate collision response. I also plan to ...
5
votes
2answers
2k views
Is it worth it to use Bullet for 2D physics instead of Box2D for the sake of learning Bullet?
There isn't much more to the question. I'm not concerned about overhead, as I'm sure they are both fine for my purposes. Basically, I am familiar with Box2D concepts because of the Farseer Physics ...
5
votes
4answers
558 views
How to save and restore Bullet Physics state?
I'm looking for information on how to save the runtime state of rigid bodies with Bullet Physics. Most of my world consists of static objects, but I have a few dynamic and kinematic objects as well. I ...
5
votes
1answer
1k views
Should I use procedural animation?
I have started to make a fantasy 3d fps swordplay game and I want to add animations. I don't want to animate everything by hand because it would take a lot of time, so I decided to use procedural ...
5
votes
2answers
1k views
How to disable Y-axis movement in the Bullet physics engine
I want to create an object than only moves along the the X and Z axes, while keeping the Y-axis disabled (it's like movement in 2D, and the object wont fall down).
I'm currently using a 6 dof ...
5
votes
1answer
1k views
how get collision callback of two specific objects using bullet physics?
I have got problem implementing collision callback into my project. I would like to have detection between two specific objects. I have got normall collision but I want one object to stop or change ...
4
votes
2answers
537 views
Simulating the effects of wind
I am developing a mobile game for Android. It is a 3D jumping game (like ski jump) where wind plays a important role so i need to simulate it. How could I achieve this?
The game uses libgdx for ...
4
votes
2answers
266 views
Intersection points of plane set forming convex hull
Mostly looking for a nudge in the right direction here. Given a set of planes (defined as a normal and distance from origin) that form a convex hull, I would like to find the intersection points that ...
4
votes
0answers
344 views
Bullet Physics implementing custom MotionState class
I'm trying to make my engine's camera a kinematic rigid body that can collide into other rigid bodies. I've overridden the btMotionState class and implemented setKinematicPos which updates the motion ...
4
votes
1answer
701 views
How can I get my meshes to work with Bullet Physics?
The problem is that I'm trying to use my meshes with Bullet Physics for the collision part of my game.
When I attempted doing this method with my GLM(model loading library by nate robins) model, I ...
3
votes
1answer
3k views
How do I integrate bullet physics into my game?
I downloaded the release file found here, but I'm just not sure where to start. In my game I have a number of oblongs and a sphere, I want all of these to collide with one another. (They all have ...
3
votes
1answer
148 views
Moving the jBullet collision body to with the player object
I am trying to update the location of the rigid body for a player class, as my player moves around I would like the collision body to also move with the player object (currently represented as a ...
3
votes
1answer
398 views
Bullet Physics - Casting a ray straight down from a rigid body (first person camera)
I've implemented a first person camera using Bullet--it's a rigid body with a capsule shape. I've only been using Bullet for a few days and physics engines are new to me. I use ...
3
votes
0answers
289 views
Setting Orientation of Character in Bullet/Ogre [closed]
I've been suffering from an issue regarding the implementation of orienting characters in a game I'm implementing using Ogre3D and Bullet physics.
What I have: A Direction Vector that the character ...
3
votes
0answers
233 views
How to prevent the main character to push other characters with Bullet Physics?
I am doing a 3D RPG game, and I want the player to be unable to push the other characters in the game like if they were inside the static geometry of the level, but I want the other characters to push ...
3
votes
0answers
298 views
How can I make bodies that do not stick to the wall in Bullet Physics? [duplicate]
Possible Duplicate:
Physics engine recommendation which can simulate pool game correctly?
I made a Billiards scene with Bullet Physics, but I've got a problem. When the ball is slowing down ...
2
votes
3answers
2k views
How do I check collision when firing bullet?
I'm currently creating 2D game from top perspective. I'm having problems with bullets. Yes, I currently simulate their movement so user can see them (about 2x ). Moving them with
// this is static
...
2
votes
2answers
264 views
How to account for speed of the vehicle when shooting shells from it?
I'm developing a simple 3D ship game using libgdx and bullet.
When a user taps the mouse I create a new shell object and send it in the direction of the mouse click. However, if the user has tapped ...
2
votes
2answers
4k views
Ogre 3d and bullet physics interaction
I have been playing around with Ogre3d and trying to integrate bullet physics. I have previously somewhat successfully got this functionality working with irrlicht and bullet and I am trying to base ...
2
votes
2answers
464 views
Can I change shape of a rigid body after it created in Bullet3D?
I'm beginning Bullet3D. Can I change collision shape of a rigid body after it created? A rigid body accepts a collision shape when it's creating, but it's hard to find options changes the collision ...
2
votes
2answers
249 views
What is the best way to check if there is overlap between player and static, non-collidable items in bullet physic engine
I'd like to add non collidable objects (eg: power ups, items, ...) in a game world using Bullet Physics Engine and to know if there is collision between player and them.
Some info : there is a lot ...
2
votes
2answers
478 views
How to load a terrain of connected caves into bullet-phisics engine?
I have a terrain that can not be represented as height map. Say a mountain with caves. I have it in one large .obj file. How do I load such a terrain into bullet-phisics engine?
Or I shall generate ...
2
votes
2answers
584 views
Efficient Bullet Firing Class
I've been struggling with this for a while. I have been trying to create a bullet pool class for a game I have made that doesn't cause a significant fps drop.
I have tried creating a bullet pool ...
2
votes
1answer
513 views
Can Bullet Physics (or another 3d physics engine) use callbacks in my engine to check static geometry?
I'm wondering if it's possible to use or hack Bullet 3d Physics (or another free 3D physics engine) so that I don't need to "import" my static geometry into Bullet - instead I want to do it the other ...
2
votes
2answers
937 views
How do you setup the Irrlicht and Bullet engines for Android development?
I have begun researching graphics and physics engines to use for an Android 3d game that I would like to make.
While researching I stumbled across this page where he talks about how you can use the ...
2
votes
1answer
852 views
How can I enable CCD in Bullet Physics?
How can I enable Continuous Collision Detection (CCD) in Bullet Physics?
2
votes
1answer
586 views
How can I exclude some rigid body from rayTest in Bullet Physics?
I'm trying to picking some object with rayTest method of BulletPhysics. The problem is my stage is surrounded with walls (btStaticPlane) and the target objects (btSphereShape) are in there. And I'm ...
2
votes
1answer
154 views
Bullet physics: how to make a soft body “static” (kind of)?
I'm fairly new to Bullet and started using it a week ago. I mainly played with rigid bodies and everything works as expected but now that I also need to add soft bodies into my simulation, things got ...
2
votes
2answers
183 views
Choosing a correct collisionshape for a voxel engine
I am building a voxel engine on Ogre with bullet as a physics engine.
I separated my blocks into chunks to help batch together render calls.
At the moment, each chunk's physics is handled by a ...
2
votes
0answers
138 views
Inverse Dynamics How to
I have some motion capture data (kinect) that records all body joints (32fps) and I want to take particular positions (for example when a person moves both of his hands up in the sky in celebration ...
1
vote
3answers
651 views
How do you stop OgreBullet Capsule from falling over?
I've just started implementing bullet into my Ogre project. I followed the install instructions here: http://www.ogre3d.org/tikiwiki/OgreBullet+Tutorial+1
And the rest if the tutorial here:
...
1
vote
1answer
178 views
Rotating a cube using jBullet collisions
How would one go about rotating/flipping a cube with the physics of jBullet?
Here is my Draw method for my cube object:
public void Draw() {
// center point posX, posY, posZ
float ...
1
vote
1answer
1k views
Object rotating error in Bullet Physics with OpenGL
I have got some problem in my OpenGL game. I am using bullet physics and I want to achive quite simple effect - I want one object (a sphere) to roll and hit another (box) which will fall down.
I have ...
1
vote
1answer
717 views
Bullet Physics Terrain
Im trying to Load an RGB image (.BMP) into bullet's btHeightfieldTerrainShape
Im using a loader that creates a openGL height map, it stores the data in a vector float, but I cant get the ...
1
vote
2answers
98 views
How to correctly create bullet rigid from custom .mesh in Ogre?
Being new to 3d programming and bullet physics in particular, I am wondering how a 3d model or the mesh generated out of it effects the accuracy of bullet physics simulation.
I have written a ...
1
vote
1answer
25 views
How to squash stretch the Bounding box so as to get Good Physics effect
I have Surrounded a game Object with a rectangular Box and applied Physics properties to that Box so that load on the computation gets reduced. But i have a problem, whenever in animation if the Game ...
1
vote
1answer
156 views
Bullet Physic: Transform body after adding
I would like to transform a rigidbody after adding it to the btDiscreteDynamicsWorld.
When I use the CF_KINEMATIC_OBJECT flag I am able to transform it but it's static (no collision response/gravity). ...
1
vote
1answer
238 views
Roughly how many rigid bodies can I expect to have interacting in Bullet?
On my Phenom II desktop machine (about 3 years old) with 8GB of RAM, it seems that I can only throw around a hundred or two boxes before it starts to go slow. I'm using the built-in DbvtBroadphase.
...
1
vote
1answer
166 views
3D/perspective Top down shooter bullet issues
I'm developing a top-down shooter with multiple levels (ground for ground units, middle level for buildings, top level for air unity).
The problem is the collision. Though I can make the collider ...
1
vote
1answer
366 views
Bullet physics in python and pygame
I am programming a 2D sidescroller in python and pygame and am having trouble making a bullet go farther than just farther than the player. The bullet travels straight to the ground after i fire it. ...
1
vote
1answer
266 views
How would I setup the Environment Variables for BulletPhysics?
I am using Bullet Physics v2.78. And Im trying to build this library to be used for ogrebullet. The main problem is that Im getting errors trying to find the Bullet Directory.
Im wondering if maybe ...
1
vote
2answers
1k views
How would I use GLM for Bullet Physics?
Right now im working on my c++ game, and im having alot of trouble using GLM and Bullet Physics to create my world correctly.
The main problem is that when i export my physics with Blenderv2.57, and ...
1
vote
0answers
11 views
Collision Detection Problems in Bullet Physics
I am trying to detect collisions between two objects, both btBoxShapes. One of them, I update by setting
body->setWorldTransform(transform);
I have implemented collision detection using the ...
1
vote
0answers
27 views
Bullet btGeneric6DofConstraint and btGeneric6DofSpringConstraint constructor arguments
I have a very simple (and maybe too primitive to post here but I’ll try anyway :P) question about Bullet constraints. What are arguments const btTransform &frameInA, const btTransform ...
