collision-detection

I need physics engine to simulate game world on server. I googled for .Net physics engines and they all were released in 2006-2009. So is there any good physics engine that I can use? What I need from engine is box, spheres collisions.. Update: sorry forgot to mention i need 3d engine Update: In case someone will need managed physics engine look at Jitter , it's pure managed and from the developer of JigLibX I've used the very good Newton Game Dynamics via P/Invoke. http://newtondynamics.com/forum/newton.php There's also the well-regarded Bullet Physics engine, but I've never used it directly.

In Android I use a SurfaceView to display a simple 2D game. The bitmaps (.png) with alpha (representing the game objects) are drawn on the canvas. Now I would like to do a simple but accurate collision detection. Checking whether these bitmaps are overlapping is quite easy. But how do I check for collisions when these bitmaps have transparent areas? My challenge is detecting whether two balls collide or not. They fill up the whole bitmap in width and height both but in all four edges, there are transparent areas of course as it's a circle in a square. What is the easiest way to detect

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

I'm using d3 to animate a route (path) on a map. When the route reaches a point along the route I'd like to popup some information. Most of my code is based on the following example. http://bl.ocks.org/mbostock/1705868 . I'm really just trying to determine if there is a way to detect when the transitioning circle collides or overlaps any of the stationary circles in this example. You can detect collision in your tween function. Define a collide function to be called from inside the tween function as follows: function collide(node){ var trans = d3.transform(d3.select(node).attr("transform"))

Collision detection is pretty simple in Swift - yet on this particular project, body collision is not triggering the didBeginContact event as usual. Here is my checklist for two bodies colliding (using soldiers and bullets): Add SKPhysicsContactDelegate to the class. set the physicsWorld appropriately, usually: self.physicsWorld.contactDelegate = self Create categories for each group of nodes you will have. E.g. let bulletCategory = 0x1 << 0 Create SKNodes for each bullet and soldier. Give each bullet and soldier a physics body with a matching shape. Set each bullet's categoryBitMask to the

I have created Polygon object to wrap my airplane (size of airplane's TextureRegion is 256x74, but size of this one in a game is 70x20). So: TextureRegion[] texRegsAirplane = TextureRegion.split(textureAirplane, 256, 74); Rectangle bounds = new Rectangle(0, 0, 70, 20); Polygon polygon = new Polygon(new float[]{0,0,bounds.width,0,bounds.width,bounds.height,0,bounds.height,0,0}); After that in my update function I update position of it: public void update(float delta){ Vector2 v = getPosition(); v.add(velocity); polygon.setPosition(v.x, v.y); } Then I render polygon to know where it is: public