bugfix [#25824] Quats + Camera + Fly = Madness

ensure quat, delta rotation is set to a unit quaternion on older files.

2 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index d6d9c0a1c22..16b8ff8e472 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -123,6 +123,7 @@ void mid_v3_v3v3(float r[3], const float a[3], const float b[3]);
 /********************************* Comparison ********************************/
 
 MINLINE int is_zero_v3(const float a[3]);
+MINLINE int is_zero_v4(const float a[4]);
 MINLINE int is_one_v3(const float a[3]);
 
 MINLINE int equals_v2v2(const float *v1, const float *v2);
diff --git a/source/blender/blenlib/intern/math_vector_inline.c b/source/blender/blenlib/intern/math_vector_inline.c
index a01455c8df0..ae1b443bc56 100644
--- a/source/blender/blenlib/intern/math_vector_inline.c
+++ b/source/blender/blenlib/intern/math_vector_inline.c
@@ -427,11 +427,16 @@ MINLINE void normal_float_to_short_v3(short *out, const float *in)
 
 /********************************* Comparison ********************************/
 
-MINLINE int is_zero_v3(const float *v)
+MINLINE int is_zero_v3(const float v[3])
 {
 	return (v[0] == 0 && v[1] == 0 && v[2] == 0);
 }
 
+MINLINE int is_zero_v4(const float v[4])
+{
+	return (v[0] == 0 && v[1] == 0 && v[2] == 0 && v[3] == 0);
+}
+
 MINLINE int is_one_v3(const float *v)
 {
 	return (v[0] == 1 && v[1] == 1 && v[2] == 1);