game-physics

is it possible to use applyAngularImpulse but not exponentially increase the speed of the wheel? Ideally I'd like to have the wheel follow my finger, but setting node.zRotation += atan2f(y2-y1, x2-x1) spins my wheel out of control. here's what i settled on, but it feels pretty wonky: - (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; SKNode *node = [self nodeAtPoint:location]; CGPoint positionInScene = [touch locationInNode:self]; CGPoint previousPosition = [touch previousLocationInNode:self]; [node.physicsBody applyAngularImpulse:

Since I changed from the helper class CharacterControl to the new BetterCharacterControl I notice some improvements such as pushing other characters is working but my main character has started sliding over steps and can't climb higher steps. I must jump the step above which is not the right way of playing, it should be just walking over. The old helper class CharacterControl had a default way of not sliding, just walking over steps and I think it can be corrected by altering the code where I create the main character. private void createNinja() { ninjaNode = (Node) assetManager .loadModel(

I'm attempting to create my own primitive 2D graphics based game engine. The core component of the game is firing different projectiles at enemies. I need to get this component working before I can continue working. What I have now moves my projectile along a line going through the Starting point (x, y) and the Target point (x1, x2). I make use of the linear function y = mx + b . The problem is that how I update the position of the projectile causes an inconsistent velocity depending on the slope of the line. (greater slopes cause it to move away more quickly). Here's the core structure of the

I've just began to work with the Libgdx's Box2d Engine but i simply do not understand when the methods of the Contactlistener should be called. There is on the one hand "begin contact" and on the other "end contact". Where should i call them, to get the Number of of a certain fixture touching others? And how do I implement the Contactlistener ? A redirec' to a Tutorial would answer my Question. I didn't find anything while searching google. This one helped me a lot but it is written for C++ and does not refer to the implementation into a main-gamecircle. Thx for helping me ;) Here's a short

I'm trying to use Bullet Physics for collision detection only. I don't need it to move any objects for me or handle rendering with callbacks. I just want to update object locations every frame and use it to tell me when I have collisions. To get the simplest example going, I'm trying to find collisions between objects with btBoxShape as their shape. Everything runs fine without crashes or apparent memory leaks, but I get no collisions so I must be making some mistakes somewhere. I'll try to keep this as brief as I can without leaving anything important out. Here's my world setup function:

Since in the digital world a real collision almost never happens, we will always have a situation where the "colliding" circle overlaps the rectangle. How to put back the circle in the situation where it collides perfectly with the rectangle without overlap? Suppose that the rectangle is stopped (null velocity) and axis-aligned. I would solve this problem with a posteriori approach (in two dimensions). In short I have to solve this equation for t : Where: is a number that answers to the question: how many frames ago did the collision happen perfectly? is the radius of the circle. is the center