Refactor: Rename Object->imat to Object->world_to_object

The goal is to improve clarity and readability, without
introducing big design changes.

Follows the recent obmat to object_to_world refactor: the
similar naming is used, and it is a run-time only rename,
meaning, there is no affect on .blend files.

This patch does not touch the redundant inversions. Those
can be removed in almost (if not all) cases, but it would
be the best to do it as a separate change.

Differential Revision: https://developer.blender.org/D16367

3 files changed, 14 insertions, 14 deletions

diff --git a/source/blender/editors/object/object_hook.c b/source/blender/editors/object/object_hook.c
index 63093692e43..d52c7f0b8d4 100644
--- a/source/blender/editors/object/object_hook.c
+++ b/source/blender/editors/object/object_hook.c
@@ -556,13 +556,13 @@ static int add_hook_object(const bContext *C,
 
   unit_m4(pose_mat);
 
-  invert_m4_m4(obedit->imat, obedit->object_to_world);
+  invert_m4_m4(obedit->world_to_object, obedit->object_to_world);
   if (mode == OBJECT_ADDHOOK_NEWOB) {
     /* pass */
   }
   else {
     /* may overwrite with pose-bone location, below */
-    mul_v3_m4v3(cent, obedit->imat, ob->object_to_world[3]);
+    mul_v3_m4v3(cent, obedit->world_to_object, ob->object_to_world[3]);
   }
 
   if (mode == OBJECT_ADDHOOK_SELOB_BONE) {
@@ -577,7 +577,7 @@ static int add_hook_object(const bContext *C,
       if (LIKELY(pchan_act)) {
         invert_m4_m4(pose_mat, pchan_act->pose_mat);
         mul_v3_m4v3(cent, ob->object_to_world, pchan_act->pose_mat[3]);
-        mul_v3_m4v3(cent, obedit->imat, cent);
+        mul_v3_m4v3(cent, obedit->world_to_object, cent);
       }
     }
     else {
@@ -588,16 +588,16 @@ static int add_hook_object(const bContext *C,
   copy_v3_v3(hmd->cent, cent);
 
   /* matrix calculus */
-  /* vert x (obmat x hook->imat) x hook->object_to_world x ob->imat */
+  /* vert x (obmat x hook->world_to_object) x hook->object_to_world x ob->world_to_object */
   /*        (parentinv         )                          */
   Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
   Object *object_eval = DEG_get_evaluated_object(depsgraph, ob);
   BKE_object_transform_copy(object_eval, ob);
   BKE_object_where_is_calc(depsgraph, scene_eval, object_eval);
 
-  invert_m4_m4(object_eval->imat, object_eval->object_to_world);
+  invert_m4_m4(object_eval->world_to_object, object_eval->object_to_world);
   /* apparently this call goes from right to left... */
-  mul_m4_series(hmd->parentinv, pose_mat, object_eval->imat, obedit->object_to_world);
+  mul_m4_series(hmd->parentinv, pose_mat, object_eval->world_to_object, obedit->object_to_world);
 
   DEG_relations_tag_update(bmain);
 
diff --git a/source/blender/editors/object/object_remesh.cc b/source/blender/editors/object/object_remesh.cc
index c653610d6fe..69fa84aa260 100644
--- a/source/blender/editors/object/object_remesh.cc
+++ b/source/blender/editors/object/object_remesh.cc
@@ -494,10 +494,10 @@ static int voxel_size_edit_invoke(bContext *C, wmOperator *op, const wmEvent *ev
   float view_normal[3] = {0.0f, 0.0f, 1.0f};
 
   /* Calculate the view normal. */
-  invert_m4_m4(active_object->imat, active_object->object_to_world);
+  invert_m4_m4(active_object->world_to_object, active_object->object_to_world);
   copy_m3_m4(mat, rv3d->viewinv);
   mul_m3_v3(mat, view_normal);
-  copy_m3_m4(mat, active_object->imat);
+  copy_m3_m4(mat, active_object->world_to_object);
   mul_m3_v3(mat, view_normal);
   normalize_v3(view_normal);
 
diff --git a/source/blender/editors/object/object_transform.cc b/source/blender/editors/object/object_transform.cc
index a863e9ac324..0c2aca8b97b 100644
--- a/source/blender/editors/object/object_transform.cc
+++ b/source/blender/editors/object/object_transform.cc
@@ -1274,8 +1274,8 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 
       if (centermode == ORIGIN_TO_CURSOR) {
         copy_v3_v3(cent, cursor);
-        invert_m4_m4(obedit->imat, obedit->object_to_world);
-        mul_m4_v3(obedit->imat, cent);
+        invert_m4_m4(obedit->world_to_object, obedit->object_to_world);
+        mul_m4_v3(obedit->world_to_object, cent);
       }
       else {
         if (around == V3D_AROUND_CENTER_BOUNDS) {
@@ -1342,8 +1342,8 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 
     if (centermode == ORIGIN_TO_CURSOR) {
       copy_v3_v3(cent, cursor);
-      invert_m4_m4(ob->imat, ob->object_to_world);
-      mul_m4_v3(ob->imat, cent);
+      invert_m4_m4(ob->world_to_object, ob->object_to_world);
+      mul_m4_v3(ob->world_to_object, cent);
     }
 
     if (ob->data == nullptr) {
@@ -1363,8 +1363,8 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
             INIT_MINMAX(min, max);
             BKE_object_minmax_dupli(depsgraph, scene, ob, min, max, true);
             mid_v3_v3v3(cent, min, max);
-            invert_m4_m4(ob->imat, ob->object_to_world);
-            mul_m4_v3(ob->imat, cent);
+            invert_m4_m4(ob->world_to_object, ob->object_to_world);
+            mul_m4_v3(ob->world_to_object, cent);
           }
 
           add_v3_v3(ob->instance_collection->instance_offset, cent);