X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fanimation.cpp;h=8135cb5995a406e5f9b722f5ca242b3c60eecb96;hb=cbe341d00829fd0eab8f3d4bde840ccae61be7e9;hp=1aa8242aca1eca403d10e3cb33a6f9d9fd8d1bc6;hpb=269a74980e2db1ee5004b643f23c2607a77ead58;p=libs%2Fgl.git

diff --git a/source/animation.cpp b/source/animation.cpp
index 1aa8242a..8135cb59 100644
--- a/source/animation.cpp
+++ b/source/animation.cpp
@@ -59,18 +59,17 @@ Animation::AxisInterpolation::AxisInterpolation(const double *axis1, const doubl
 {
 	// Compute a normalized vector halfway between the two endpoints
 	double half[3];
-	double len = 0;
+	double a1_len = 0;
+	double h_len = 0;
 	for(unsigned i=0; i<3; ++i)
 	{
 		half[i] = (axis1[i]+axis2[i])/2;
-		len += half[i]*half[i];
+		a1_len += axis1[i]*axis1[i];
+		h_len += half[i]*half[i];
 	}
-	len = sqrt(len);
-	for(unsigned i=0; i<3; ++i)
-		half[i] /= len;
 
 	// Compute correction factors for smooth interpolation
-	double cos_half = axis1[0]*half[0]+axis1[1]*half[1]+axis1[2]*half[2];
+	double cos_half = (axis1[0]*half[0]+axis1[1]*half[1]+axis1[2]*half[2])/sqrt(a1_len*h_len);
 	double angle = acos(cos_half);
 	slope = (angle ? angle/tan(angle) : 1);
 	scale = cos_half;