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Chipmunk Physics • View topic - Division on Zero
Page 1 of 3

Division on Zero

PostPosted: Fri Aug 27, 2010 1:17 pm
by ShiftZ

Re: Division on Zero

PostPosted: Fri Aug 27, 2010 3:53 pm
by slembcke
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.

Re: Division on Zero

PostPosted: Sat Aug 28, 2010 5:23 am
by ShiftZ

Re: Division on Zero

PostPosted: Sun Aug 29, 2010 8:57 pm
by slembcke

Re: Division on Zero

PostPosted: Mon Aug 30, 2010 5:09 am
by ShiftZ
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.

Re: Division on Zero

PostPosted: Mon Aug 30, 2010 8:21 am
by slembcke
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.

Re: Division on Zero

PostPosted: Mon Aug 30, 2010 8:38 am
by ShiftZ

Re: Division on Zero

PostPosted: Mon Aug 30, 2010 10:40 am
by slembcke

Re: Division on Zero

PostPosted: Thu Sep 09, 2010 9:34 am
by ShiftZ

Re: Division on Zero

PostPosted: Thu Sep 09, 2010 12:12 pm
by slembcke
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.