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Originally Posted by Stefan
Ok I understand, don't know why the function should care about the rotation of the colliding line though, since movements must be linear anyway
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Well, moving linearly from point A to point B between two frames is just an approximation to a smooth, continuous motion. There'd be a difference between a curved path and a linear one, even if it's relatively small.
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The simpliest way would probably be to just check for the tiles by script (several onwall checks along the line in steps of 1 tile). That way you can also theoretically detect diagonal walls
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Yeah, it kind of works, but you can't get much precision unless you use dozens of checks. Recently I made a little system that scans through the level and builds an array of vectors representing walls (like, if there were a bush in a level then it would define a wall vector for each of its sides). Then I used some fairly simple vector calculations to find out exactly where and when a collision would occur between a wall and a moving object. It's very fast and extremely precise, but it can't handle dynamic objects (players, movable tiles, etc) or NPCs with weird shapes. It's really only good for minigames.
Out of curiosity, how does collision detection work in Graal3D? I haven't had a chance to play with its scripting engine yet
