Division on Zero

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Looks like you are trying to do a zero length segment query. I think the correct behavior in that case would be to ignore the query altogether. With the way segment queries work, it would be impossible to detect a hit with any shape.

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I noticed that the division by zero greatly stall iPhone processor. I had a bug once, an unexplainable lags on iPhone when player is dead. Problem was that maxSpeed of player was zero and it was divisor in some places. So i switched on floating point exceptions to catch such situations and catched problem described above.

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Hrm. That's strange, I've never heard of that before. Division by zero to get infinity is the standard floating point behavior. It shouldn't be producing any floating point exceptions, but I guess I'm not totally surprised that it's handled in a way that produces a stall though. Floating division generally already stalls the CPU pipeline on most CPUs.

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Wrapped an if around it. Looks like I have some other unneeded code in there too. I'l have to look into that at some point.