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slight speedup in Matrix4.rotationAngleAxisMatrix by cutting down object lookups and redundant multiplications

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astrodud
2011-01-17 21:41:13 -08:00
parent f3fd1bcfe6
commit 151ff4394e
1 changed files with 10 additions and 9 deletions
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src/core/Matrix4.js
+10 -9
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@@ -373,16 +373,17 @@ THREE.Matrix4.rotationAxisAngleMatrix = function ( axis, angle ) {
c = Math.cos( angle ),
s = Math.sin( angle ),
t = 1 - c,
x = axis.x, y = axis.y, z = axis.z;
x = axis.x, y = axis.y, z = axis.z,
tx = t * x, ty = t * y;
rot.n11 = t * x * x + c;
rot.n12 = t * x * y - s * z;
rot.n13 = t * x * z + s * y;
rot.n21 = t * x * y + s * z;
rot.n22 = t * y * y + c;
rot.n23 = t * y * z - s * x;
rot.n31 = t * x * z - s * y;
rot.n32 = t * y * z + s * x;
rot.n11 = tx * x + c;
rot.n12 = tx * y - s * z;
rot.n13 = tx * z + s * y;
rot.n21 = tx * y + s * z;
rot.n22 = ty * y + c;
rot.n23 = ty * z - s * x;
rot.n31 = tx * z - s * y;
rot.n32 = ty * z + s * x;
rot.n33 = t * z * z + c;
return rot;