Multi-Objects: MESH_OT_select_similar worldspace completion

This makes the operator to work 100% with worldspace similarity:
* SIMFACE_PERIMETER
* SIMFACE_AREA
* SIMEDGE_FACE_ANGLE

Note from revisor (Dalai Felinto):

I'm not sure we want to pass Object * to the bmesh api, though I
personally don't see why not. Either way I group the patches together so
we can more easily roll them back if needs be.

Maniphest Tasks: T56948
Differential Revision: D3908, D3899, D3896

1 files changed, 40 insertions, 0 deletions

diff --git a/source/blender/bmesh/intern/bmesh_query.c b/source/blender/bmesh/intern/bmesh_query.c
index 540888ac0b9..c51c6322136 100644
--- a/source/blender/bmesh/intern/bmesh_query.c
+++ b/source/blender/bmesh/intern/bmesh_query.c
@@ -31,6 +31,8 @@
  * of inspecting the mesh structure directly.
  */
 
+#include "DNA_object_types.h"
+
 #include "MEM_guardedalloc.h"
 
 #include "BLI_math.h"
@@ -39,6 +41,7 @@
 #include "BLI_utildefines_stack.h"
 
 #include "BKE_customdata.h"
+#include "BKE_object.h"
 
 #include "bmesh.h"
 #include "intern/bmesh_private.h"
@@ -1678,6 +1681,43 @@ float BM_edge_calc_face_angle(const BMEdge *e)
 }
 
 /**
+* \brief BMESH EDGE/FACE ANGLE
+*
+* Calculates the angle between two faces in world space.
+* Assumes the face normals are correct.
+*
+* \return angle in radians
+*/
+float BM_edge_calc_face_angle_worldspace_ex(Object *ob, const BMEdge *e, const float fallback)
+{
+	if (BM_edge_is_manifold(e)) {
+		const BMLoop *l1 = e->l;
+		const BMLoop *l2 = e->l->radial_next;
+		float no1[3], no2[3];
+		copy_v3_v3(no1, l1->f->no);
+		copy_v3_v3(no2, l2->f->no);
+
+		float smat[3][3];
+		BKE_object_scale_to_mat3(ob, smat);
+		invert_m3(smat);
+
+		mul_m3_v3(smat, no1);
+		mul_m3_v3(smat, no2);
+		normalize_v3(no1);
+		normalize_v3(no2);
+
+		return angle_normalized_v3v3(no1, no2);
+	}
+	else {
+		return fallback;
+	}
+}
+float BM_edge_calc_face_angle_worldspace(Object *ob, const BMEdge *e)
+{
+	return BM_edge_calc_face_angle_worldspace_ex(ob, e, DEG2RADF(90.0f));
+}
+
+/**
  * \brief BMESH EDGE/FACE ANGLE
  *
  * Calculates the angle between two faces.