physics-engine

I've created a simple 2d physics engine in Java that uses circular projectiles and straight walls. Currently, with each frame, every projectile's position is advanced by velocity * (1/fps) . Velocity is updated afterwards, once per frame. Collision detection defines a line in point-slope form using the previous and current position, checks if that line intersects with a wall, and if that intersection lies in between the previous position and current position, a collision is registered and the projectile's current position and velocity is updated accordingly. At the moment, there is no rotation

I have a closed convex polyhedron which is defined by an array of convex polygons (faces) which are defined by arrays of vertices in 3D space. I'm trying to find the centroid of the polyhedron, assuming uniform density. At the moment I calculate it with the algorithm in this pseudo-code. public Vector3 getCentroid() { Vector3 centroid = (0, 0, 0); for (face in faces) { Vector3 point = face.centroid; point.multiply(face.area()); centroid.add(point); } centroid.divide(faces.size()); return centroid; } This essentially takes the weighted average of the centroids of the faces. I'm not 100% sure

I am using box2d on the iphone to create a game. I have a body that is effected by gravity to move down and not right or left. It will get hit by another body and will then be moving right or left. I then have a reset button which moves the body back to its starting point. The only problem is that it is still moving right or left. How can I counteract the forces that a ball is already traveling? How can I get rid of this right and left movement when I reset my game? box2d automatically clears forces each simulation step. I think you are just changing you body's position when reseting, but not

After looking into 3D game programming, it quickly became evident why a physics engine could be extremely useful. What physics engines are supported by and viable on Android? Any other advice regarding them would be nice. Thanks It is not 3D, but AndEngine could at least provide you some useful information to start with. It is a very promising and free Open Source 2D OpenGL Game Engine for the Android platform. Have a look at their example application to see what it can do :) Here's a 2D JavaScript engine that looks interesting: Box2D The latest Matali Physics Pro supports Android OS through