Hi, My question is about collision detection, to be more exact how to find out if two boxes that are rotated are overlapping. I have searched the web and tried out several different CD libraries but none seem to be able to calculate this. What I have is two objects (cars), I have their x,y location and their rotation. From this and some other code I can work out the x,y coords of the four corners. I then have 4 co-ordinates and wish to use these (the 4 corners of the car) to form the box. How would I calculate whether these boxes are overlapping? At this stage I don''t really need pixel-perfect CD just to know whether these two boxes are overlapping. My coords are usually something like this:- .........x1,y1............x2,y2.......... ......................................... ......................................... ................x3,y3.............x4,y4.. ......................................... The other box then might be rotated like this .................x1,y1..........x2,y2.... ......................................... .............x3,y3..........x4,y4........ ......................................... ......................................... (I hope this looks right) Could anybody point me in the direction of a set of functions that could do this?, any pseudo code would also be fine. Thanks, Oli Norwell

I remember seeing something about collision detection with rotated rectangles at http://qsoft.cjb.net/ (Have a look around in the tutorials section)



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Thanks for this!, it was exactley what I needed!.