From 6527f42b6bd1b918c5e7b0c865024c14806ac1ae Mon Sep 17 00:00:00 2001 From: Sergey Sharybin Date: Tue, 1 May 2012 11:01:24 +0000 Subject: Fix #31193: Normals don't have any Z component Issue was caused by heavily non-uniform scale applied on object. Run scale correction on face and vertex normals draw if there's non-uniform scale. --- source/blender/blenlib/intern/math_matrix.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'source/blender/blenlib/intern/math_matrix.c') diff --git a/source/blender/blenlib/intern/math_matrix.c b/source/blender/blenlib/intern/math_matrix.c index bb0b8897b15..b3b58dca1a6 100644 --- a/source/blender/blenlib/intern/math_matrix.c +++ b/source/blender/blenlib/intern/math_matrix.c @@ -866,6 +866,35 @@ int is_orthonormal_m4(float m[][4]) return 0; } +int is_uniform_scaled_m3(float m[][3]) +{ + const float eps = 1e-7; + float t[3][3]; + float l1, l2, l3, l4, l5, l6; + + copy_m3_m3(t, m); + transpose_m3(t); + + l1 = len_squared_v3(m[0]); + l2 = len_squared_v3(m[1]); + l3 = len_squared_v3(m[2]); + + l4 = len_squared_v3(t[0]); + l5 = len_squared_v3(t[1]); + l6 = len_squared_v3(t[2]); + + if (fabsf(l2 - l1) <= eps && + fabsf(l3 - l1) <= eps && + fabsf(l4 - l1) <= eps && + fabsf(l5 - l1) <= eps && + fabsf(l6 - l1) <= eps) + { + return 1; + } + + return 0; +} + void normalize_m3(float mat[][3]) { normalize_v3(mat[0]); -- cgit v1.2.3