Hi,
The following code occasionally leaves p with NaN value:
[code]double cosFi=vec1*vec2/(vec1.length()*vec2.length());
//cosine of angle between vectors
p+=acos(cosFi)*...;[/code]
Due to numerical round-off errors it would rarely occur that cosFi>1 (something
like 1.00000002534), and acos would produce NaN, which would then propagate
further, causing a crash far away in the code.
I have solved it like this:
[code]if (cosFi>1)
cosFi=1;
else if (cosFi<-1)
cosFi=-1;[/code]
How common is this type of error and what is the usual way of dealing with it?
Thank you!
Cheers,
Dženan
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http://forum.openscenegraph.org/viewtopic.php?p=29431#29431
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