From 55a3d48046377444a3c36ffe7a6164030d447f6f Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Fri, 21 Apr 2017 17:26:27 +1000
Subject: Docs: diagram for reflect_v3_v3v3

---
 source/blender/blenlib/intern/math_vector.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'source/blender/blenlib')

diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c
index dfecc3b556a..37897e2cd32 100644
--- a/source/blender/blenlib/intern/math_vector.c
+++ b/source/blender/blenlib/intern/math_vector.c
@@ -697,7 +697,19 @@ void bisect_v3_v3v3v3(float out[3], const float v1[3], const float v2[3], const
 
 /**
  * Returns a reflection vector from a vector and a normal vector
- * reflect = vec - ((2 * DotVecs(vec, mirror)) * mirror)
+ * reflect = vec - ((2 * dot(vec, mirror)) * mirror).
+ *
+ * <pre>
+ * v
+ * +  ^
+ *  \ |
+ *   \|
+ *    + normal: axis of reflection
+ *   /
+ *  /
+ * +
+ * out: result (negate for a 'bounce').
+ * </pre>
  */
 void reflect_v3_v3v3(float out[3], const float v[3], const float normal[3])
 {
-- 
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