2 files changed, 22 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index 3399287dd46..1425e7da1bc 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -367,6 +367,10 @@ MINLINE bool compare_len_v3v3(const float a[3],
                               const float b[3],
                               const float limit) ATTR_WARN_UNUSED_RESULT;
 
+MINLINE bool compare_size_v3v3(const float a[3],
+                               const float b[3],
+                               const float limit) ATTR_WARN_UNUSED_RESULT;
+
 MINLINE float line_point_side_v2(const float l1[2],
                                  const float l2[2],
                                  const float pt[2]) ATTR_WARN_UNUSED_RESULT;
diff --git a/source/blender/blenlib/intern/math_vector_inline.c b/source/blender/blenlib/intern/math_vector_inline.c
index 13a87b9ec6a..d3c975e3249 100644
--- a/source/blender/blenlib/intern/math_vector_inline.c
+++ b/source/blender/blenlib/intern/math_vector_inline.c
@@ -1372,6 +1372,24 @@ MINLINE bool compare_len_v3v3(const float v1[3], const float v2[3], const float
   return (dot_v3v3(d, d) <= (limit * limit));
 }
 
+MINLINE bool compare_size_v3v3(const float v1[3], const float v2[3], const float limit)
+{
+  for (int i = 0; i < 3; i++) {
+    if (v2[i] == 0.0f) {
+      /* Catch division by zero. */
+      if (v1[i] != v2[i]) {
+        return false;
+      }
+    }
+    else {
+      if (fabsf(v1[i] / v2[i] - 1.0f) > limit) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
 /** \name Vector Clamping
  * \{ */