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Chipmunk Physics • View topic - Bug in cpSpaceSegmentQueryFirst

Bug in cpSpaceSegmentQueryFirst

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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 3:36 pm

Tried calling it after all positions of the platforms (all static platforms) and calling directly before the query. No difference.
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 3:38 pm

Im going to try and make a video
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 3:48 pm

http://www.youtube.com/watch?v=A_PEWmQ0 ... e=youtu.be

the one not under the cyan circle is the mouse. I had to run this 6 times before it would reproduce the bug
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Re: Bug in cpSpaceSegmentQueryFirst

Postby slembcke » Mon Apr 29, 2013 3:48 pm

Can't sleep... Chipmunks will eat me...
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 3:57 pm

Well.... I.... think we can conclude that that is not the cause seeing as how the tree modification made it a hell of a lot *worse*
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Re: Bug in cpSpaceSegmentQueryFirst

Postby slembcke » Mon Apr 29, 2013 4:09 pm

Can't sleep... Chipmunks will eat me...
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 4:22 pm

Well either to joy or dismay, I made that modification and I cant get it to happen anymore.... so.... what now....
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 4:27 pm

further confirmation: I enabled it again and it started happening immediately
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Re: Bug in cpSpaceSegmentQueryFirst

Postby slembcke » Mon Apr 29, 2013 4:39 pm

Hrm. I dunno. I think it means that either the bounding box data is incorrect (which seems very very unlikely since you are reindexing right before querying, etc), or that MSVC doesn't compile cpBBSegmentQuery(). Those are the only two possibilities I can think of. The latter seems plausible since it uses a bunch of IEEE infinite (but not NaN) math bits to deal with lines that don't cross and such.

Do you know how to enable strict FP on MSVC? I guess I'd try that before trying to rewrite the function just to be sure. I haven't had issues with it on other platforms, and it's not doing anything particularly fancy. Maybe a compiler bug then? Either way, if strict FP doesn't fix it or ruins performance, then it will have to be rewritten differently I guess.

Another easy check would be to do a simple BB check of the ray segment against the child BBs. Wouldn't be great performance wise though, but would help narrow down the issue to cpBBSegmentQuery().
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Re: Bug in cpSpaceSegmentQueryFirst

Postby Beta Carotene » Mon Apr 29, 2013 4:48 pm

I had it set to FP:precise before, set it to FP strict and am now recompiling.
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