Hi Dženan, "Dženan Zukić" writes:
> 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? Did you try vec1.normalize(); vec2.normalize(); acos(vec1 * vec2); ? -- Alberto _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
