diff options
Diffstat (limited to 'source/blender')
| -rw-r--r-- | source/blender/blenlib/intern/math_matrix.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/source/blender/blenlib/intern/math_matrix.c b/source/blender/blenlib/intern/math_matrix.c index 8e41a86b52f..78662609679 100644 --- a/source/blender/blenlib/intern/math_matrix.c +++ b/source/blender/blenlib/intern/math_matrix.c @@ -516,7 +516,8 @@ void mul_v3_mat3_m4v3(float r[3], float mat[4][4], const float vec[3]) void mul_project_m4_v3(float mat[4][4], float vec[3]) { - const float w = mul_project_m4_v3_zfac(mat, vec); + /* absolute value to not flip the frustum upside down behind the camera */ + const float w = fabsf(mul_project_m4_v3_zfac(mat, vec)); mul_m4_v3(mat, vec); vec[0] /= w; @@ -526,7 +527,7 @@ void mul_project_m4_v3(float mat[4][4], float vec[3]) void mul_v3_project_m4_v3(float r[3], float mat[4][4], const float vec[3]) { - const float w = mul_project_m4_v3_zfac(mat, vec); + const float w = fabsf(mul_project_m4_v3_zfac(mat, vec)); mul_v3_m4v3(r, mat, vec); r[0] /= w; @@ -536,7 +537,7 @@ void mul_v3_project_m4_v3(float r[3], float mat[4][4], const float vec[3]) void mul_v2_project_m4_v3(float r[2], float mat[4][4], const float vec[3]) { - const float w = mul_project_m4_v3_zfac(mat, vec); + const float w = fabsf(mul_project_m4_v3_zfac(mat, vec)); mul_v2_m4v3(r, mat, vec); r[0] /= w; |