bugfix + minor mathutils.Vector edits.

- multiplying a 2D vector by a 3x3 or 4x4 matrix would use un-initialized memory, now throw an exception.
- use more variable length array BLI_math functions.

2 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index 35b7939329a..5a5d518940d 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -176,6 +176,7 @@ void mul_vn_fl(float *array, const int size, const float f);
 void mul_vn_vn_fl(float *array_tar, const float *array_src, const int size, const float f);
 void add_vn_vn(float *array_tar, const float *array_src, const int size);
 void add_vn_vnvn(float *array_tar, const float *array_src_a, const float *array_src_b, const int size);
+void sub_vn_vn(float *array_tar, const float *array_src, const int size);
 void sub_vn_vnvn(float *array_tar, const float *array_src_a, const float *array_src_b, const int size);
 void fill_vni(int *array_tar, const int size, const int val);
 void fill_vn(float *array_tar, const int size, const float val);
diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c
index 539d3fb97f6..37a68cb0fca 100644
--- a/source/blender/blenlib/intern/math_vector.c
+++ b/source/blender/blenlib/intern/math_vector.c
@@ -407,6 +407,14 @@ void add_vn_vnvn(float *array_tar, const float *array_src_a, const float *array_
 	while(i--) { *(tar--) = *(src_a--) + *(src_b--); }
 }
 
+void sub_vn_vn(float *array_tar, const float *array_src, const int size)
+{
+	float *tar= array_tar + (size-1);
+	const float *src= array_src + (size-1);
+	int i= size;
+	while(i--) { *(tar--) -= *(src--); }
+}
+
 void sub_vn_vnvn(float *array_tar, const float *array_src_a, const float *array_src_b, const int size)
 {
 	float *tar= array_tar + (size-1);