A little headsup for people doing blink-scripts.
The implementation of Acos in the Blink Script node have a bug, so if you
go below acos(-0.5) blink will return as drastically incorrect value.
I reported this bug a few weeks ago but have yet to receive a bug id.
I the meantime i have found this algorithm that does a fairly good job for
my needs.
float acosFast(float(x)) {
float a=1.43+0.59*x ;
a=(a+(2+2*x)/a)/2;
float b=1.65-1.41*x ;
b=(b+(2-2*x)/b)/2;
float c=0.88-0.77*x ;
c=(c+(2-a)/c)/2;
return (8*(c+(2-a)/c)-(b+(2-2*x)/b))/6;
}
-Mads Hagbarth Lund
TD, Postyr, Denmark.
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