[Bf-blender-cvs] [aa986c3] master: Correct bad mistake in own recent to commit to angle calculation

[Campbell Barton]

Commit: aa986c3f3d5cee39d218cadba2c41d218e9ef21b
Author: Campbell Barton
Date:   Tue Jan 14 13:47:24 2014 +1100
https://developer.blender.org/rBaa986c3f3d5cee39d218cadba2c41d218e9ef21b

Correct bad mistake in own recent to commit to angle calculation

===================================================================

M	source/blender/blenlib/intern/math_vector.c

===================================================================

diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c
index 6d3c74a..3671665 100644
--- a/source/blender/blenlib/intern/math_vector.c
+++ b/source/blender/blenlib/intern/math_vector.c
@@ -292,39 +292,35 @@ float angle_signed_v2v2(const float v1[2], const float v2[2])
 
 float angle_normalized_v3v3(const float v1[3], const float v2[3])
 {
-	const float len_sq = dot_v3v3(v1, v2);
-
 	/* double check they are normalized */
 	BLI_ASSERT_UNIT_V3(v1);
 	BLI_ASSERT_UNIT_V3(v2);
 
 	/* this is the same as acos(dot_v3v3(v1, v2)), but more accurate */
-	if (len_sq >= 0.0f) {
-		return 2.0f * saasin(sqrtf(len_sq) / 2.0f);
+	if (dot_v3v3(v1, v2) >= 0.0f) {
+		return 2.0f * saasin(len_v3v3(v1, v2) / 2.0f);
 	}
 	else {
-		float vec[3];
-		negate_v3_v3(vec, v2);
-		return (float)M_PI - 2.0f * saasin(len_v3v3(vec, v1) / 2.0f);
+		float v2_n[3];
+		negate_v3_v3(v2_n, v2);
+		return (float)M_PI - 2.0f * saasin(len_v3v3(v1, v2_n) / 2.0f);
 	}
 }
 
 float angle_normalized_v2v2(const float v1[2], const float v2[2])
 {
-	const float len_sq = dot_v2v2(v1, v2);
-
 	/* double check they are normalized */
 	BLI_ASSERT_UNIT_V2(v1);
 	BLI_ASSERT_UNIT_V2(v2);
 
 	/* this is the same as acos(dot_v3v3(v1, v2)), but more accurate */
-	if (len_sq >= 0.0f) {
-		return 2.0f * saasin(sqrtf(len_sq) / 2.0f);
+	if (dot_v2v2(v1, v2) >= 0.0f) {
+		return 2.0f * saasin(len_v2v2(v1, v2) / 2.0f);
 	}
 	else {
-		float vec[2];
-		negate_v2_v2(vec, v2);
-		return (float)M_PI - 2.0f * saasin(len_v2v2(vec, v1) / 2.0f);
+		float v2_n[2];
+		negate_v2_v2(v2_n, v2);
+		return (float)M_PI - 2.0f * saasin(len_v2v2(v1, v2_n) / 2.0f);
 	}
 }