From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 11 Apr 2013 19:34:15 +0000 (+0300)
Subject: Fix axis interpolation to work with scaling
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=cbe341d00829fd0eab8f3d4bde840ccae61be7e9

Fix axis interpolation to work with scaling
---

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;