mul_qt_v3-comment.diff
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Authored By

	Bill Currie (taniwha)
	Nov 13 2013, 4:06 PM

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mul_qt_v3-comment.diff
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	--- source/blender/blenlib/intern/math_rotation.c
	+++ source/blender/blenlib/intern/math_rotation.c
	@@ -78,7 +78,13 @@ void mul_qt_qtqt(float q[4], const float q1[4], const float q2[4])
	q[2] = t2;
	}

	-/* Assumes a unit quaternion */
	+/* Shortcut for q v q* when v is actually a quaternion. This removes the need
	+ * for converting a vector to a quaternion, calculating q's conjugate and
	+ * converting back to a vector. It also happens to be faster (17+,24* vs
	+ * 24+,32*). If q is not a unit quaternion, then v will be both rotated by
	+ * the same amount as if q was a unit quaternion, and scaled by the square of
	+ * the length of q.
	+ */
	void mul_qt_v3(const float q[4], float v[3])
	{
	float t0, t1, t2;

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