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Chipmunk Physics • View topic - Division on Zero
Page 2 of 3

Re: Division on Zero

PostPosted: Thu Oct 07, 2010 5:06 am
by ShiftZ
One more... no, not div by zero. Got invalid floating point operation on cpSpaceHash.c: 230 while trying to add a new shape in scene:

static inline int
floor_int(cpFloat f)
{
int i = (int)f;
...

it caused by uninitialized values of shape->bb.
Initialization has been commented for some reason cpShape.c:65
// cpShapeCacheBB(shape);

shape may have huge bb size and filll whole hash space, also may lead to very long loop casescpSpaceHash:245.

Re: Division on Zero

PostPosted: Thu Oct 07, 2010 8:34 am
by slembcke
This should be fixed in trunk as of a couple weeks ago. I had intended to move it so that the bounding box wouldn't be calculated until the shape was actually added to the space. (This was causing some other bug) It seems I missed a couple of cases though.

Re: Division on Zero

PostPosted: Wed Apr 06, 2011 9:28 am
by ShiftZ
Anyone know how to trap floating point exception on iPhone.
I had no success. All i can do is just check if floating point exception flag is raised, but it's usless without exact raising location.

Re: Division on Zero

PostPosted: Fri Sep 23, 2011 7:39 am
by ShiftZ

Re: Division on Zero

PostPosted: Fri Sep 23, 2011 9:53 am
by ShiftZ

Re: Division on Zero

PostPosted: Fri Sep 23, 2011 9:55 am
by slembcke
Hmm. That's sort of nasty. I'll have to rearrange some of those ops to use the available precision better. It's hitting that surface very nearly parallel to it's surface causing the dot products to be nearly equal even when the line segment size is not particularly small.

Re: Division on Zero

PostPosted: Fri Sep 23, 2011 10:05 am
by slembcke

Re: Division on Zero

PostPosted: Fri Sep 23, 2011 10:05 am
by ShiftZ

Re: Division on Zero

PostPosted: Tue Feb 14, 2012 4:22 am
by ShiftZ

Re: Division on Zero

PostPosted: Tue Feb 14, 2012 9:21 am
by slembcke
Yes, those were intended to produce infinity for horizontal or vertical lines.