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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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Chipmunk Physics • View topic - Division on Zero

Division on Zero

Discuss any Chipmunk bugs here.

Re: Division on Zero

Postby ShiftZ » Thu Oct 07, 2010 5:06 am

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.
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Re: Division on Zero

Postby slembcke » Thu Oct 07, 2010 8:34 am

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.
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Re: Division on Zero

Postby ShiftZ » Wed Apr 06, 2011 9:28 am

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.
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Re: Division on Zero

Postby ShiftZ » Fri Sep 23, 2011 7:39 am

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Re: Division on Zero

Postby ShiftZ » Fri Sep 23, 2011 9:53 am

Last edited by ShiftZ on Fri Sep 23, 2011 9:59 am, edited 1 time in total.
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Re: Division on Zero

Postby slembcke » Fri Sep 23, 2011 9:55 am

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.
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Re: Division on Zero

Postby slembcke » Fri Sep 23, 2011 10:05 am

Can't sleep... Chipmunks will eat me...
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Re: Division on Zero

Postby ShiftZ » Fri Sep 23, 2011 10:05 am

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Re: Division on Zero

Postby ShiftZ » Tue Feb 14, 2012 4:22 am

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Re: Division on Zero

Postby slembcke » Tue Feb 14, 2012 9:21 am

Yes, those were intended to produce infinity for horizontal or vertical lines.
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