Curve: Remove 'CU_2D' flag used for nurbs

This fixes T86440

As the CU_2D flag is set for nurbs, a Curve can have 2D nurbs mixed with 3D.

But the UI does not allow this mixing. It updates all nurbs to 2D or 3D when set.

So remove this specific flag for nurbs.

This may break old files, since 2D curves with mixed 3D are now set as 3D.

Differential Revision: https://developer.blender.org/D10738

4 files changed, 19 insertions, 21 deletions

diff --git a/source/blender/editors/curve/curve_intern.h b/source/blender/editors/curve/curve_intern.h
index 704e4b740de..8ecf41162e9 100644
--- a/source/blender/editors/curve/curve_intern.h
+++ b/source/blender/editors/curve/curve_intern.h
@@ -142,7 +142,10 @@ struct GHash *ED_curve_keyindex_hash_duplicate(struct GHash *keyindex);
 void ED_curve_keyindex_update_nurb(struct EditNurb *editnurb, struct Nurb *nu, struct Nurb *newnu);
 
 /* helper functions */
-void ed_editnurb_translate_flag(struct ListBase *editnurb, uint8_t flag, const float vec[3]);
+void ed_editnurb_translate_flag(struct ListBase *editnurb,
+                                uint8_t flag,
+                                const float vec[3],
+                                bool is_2d);
 bool ed_editnurb_extrude_flag(struct EditNurb *editnurb, const uint8_t flag);
 bool ed_editnurb_spin(float viewmat[4][4],
                       struct View3D *v3d,
diff --git a/source/blender/editors/curve/editcurve.c b/source/blender/editors/curve/editcurve.c
index 4816a432376..767d822aa39 100644
--- a/source/blender/editors/curve/editcurve.c
+++ b/source/blender/editors/curve/editcurve.c
@@ -1314,7 +1314,6 @@ void ED_curve_editnurb_make(Object *obedit)
 
     LISTBASE_FOREACH (Nurb *, nu, &cu->nurb) {
       Nurb *newnu = BKE_nurb_duplicate(nu);
-      BKE_nurb_test_2d(newnu); /* after join, or any other creation of curve */
       BLI_addtail(&editnurb->nurbs, newnu);
     }
 
@@ -1706,7 +1705,7 @@ static void rotateflagNurb(ListBase *editnurb,
   }
 }
 
-void ed_editnurb_translate_flag(ListBase *editnurb, uint8_t flag, const float vec[3])
+void ed_editnurb_translate_flag(ListBase *editnurb, uint8_t flag, const float vec[3], bool is_2d)
 {
   /* all verts with ('flag' & flag) translate */
   BezTriple *bezt;
@@ -1741,7 +1740,9 @@ void ed_editnurb_translate_flag(ListBase *editnurb, uint8_t flag, const float ve
       }
     }
 
-    BKE_nurb_test_2d(nu);
+    if (is_2d) {
+      BKE_nurb_project_2d(nu);
+    }
   }
 }
 
@@ -5401,7 +5402,7 @@ static int ed_editcurve_addvert(Curve *cu,
     mul_v3_fl(center, 1.0f / (float)verts_len);
     sub_v3_v3v3(ofs, location_init, center);
 
-    if ((cu->flag & CU_3D) == 0) {
+    if (CU_IS_2D(cu)) {
       ofs[2] = 0.0f;
     }
 
@@ -5439,7 +5440,7 @@ static int ed_editcurve_addvert(Curve *cu,
 
     copy_v3_v3(location, location_init);
 
-    if ((cu->flag & CU_3D) == 0) {
+    if (CU_IS_2D(cu)) {
       location[2] = 0.0f;
     }
 
@@ -5455,10 +5456,6 @@ static int ed_editcurve_addvert(Curve *cu,
       nurb_new->orderu = 4;
       nurb_new->flag |= CU_SMOOTH;
       BKE_nurb_bezierPoints_add(nurb_new, 1);
-
-      if ((cu->flag & CU_3D) == 0) {
-        nurb_new->flag |= CU_2D;
-      }
     }
     else {
       /* Copy the active nurb settings. */
@@ -5590,7 +5587,7 @@ static int add_vertex_invoke(bContext *C, wmOperator *op, const wmEvent *event)
       ED_transform_snap_object_context_destroy(snap_context);
     }
 
-    if ((cu->flag & CU_3D) == 0) {
+    if (CU_IS_2D(cu)) {
       const float eps = 1e-6f;
 
       /* get the view vector to 'location' */
@@ -6922,9 +6919,9 @@ int ED_curve_join_objects_exec(bContext *C, wmOperator *op)
   cu = ob_active->data;
   BLI_movelisttolist(&cu->nurb, &tempbase);
 
-  if (ob_active->type == OB_CURVE) {
+  if (ob_active->type == OB_CURVE && CU_IS_2D(cu)) {
     /* Account for mixed 2D/3D curves when joining */
-    BKE_curve_curve_dimension_update(cu);
+    BKE_curve_dimension_update(cu);
   }
 
   DEG_relations_tag_update(bmain); /* because we removed object(s), call before editmode! */
diff --git a/source/blender/editors/curve/editcurve_add.c b/source/blender/editors/curve/editcurve_add.c
index 5b66d473466..065763764c1 100644
--- a/source/blender/editors/curve/editcurve_add.c
+++ b/source/blender/editors/curve/editcurve_add.c
@@ -380,10 +380,10 @@ Nurb *ED_curve_add_nurbs_primitive(
 
         mul_mat3_m4_v3(mat, vec);
 
-        ed_editnurb_translate_flag(editnurb, SELECT, vec);
+        ed_editnurb_translate_flag(editnurb, SELECT, vec, CU_IS_2D(cu));
         ed_editnurb_extrude_flag(cu->editnurb, SELECT);
         mul_v3_fl(vec, -2.0f);
-        ed_editnurb_translate_flag(editnurb, SELECT, vec);
+        ed_editnurb_translate_flag(editnurb, SELECT, vec, CU_IS_2D(cu));
 
         BLI_remlink(editnurb, nu);
 
@@ -492,15 +492,13 @@ Nurb *ED_curve_add_nurbs_primitive(
   BLI_assert(nu != NULL);
 
   if (nu) { /* should always be set */
-    if ((obedit->type != OB_SURF) && ((cu->flag & CU_3D) == 0)) {
-      nu->flag |= CU_2D;
-    }
-
     nu->flag |= CU_SMOOTH;
     cu->actnu = BLI_listbase_count(editnurb);
     cu->actvert = CU_ACT_NONE;
 
-    BKE_nurb_test_2d(nu);
+    if (CU_IS_2D(cu)) {
+      BKE_nurb_project_2d(nu);
+    }
   }
 
   return nu;
diff --git a/source/blender/editors/curve/editcurve_paint.c b/source/blender/editors/curve/editcurve_paint.c
index 0d071f2e595..6342076df34 100644
--- a/source/blender/editors/curve/editcurve_paint.c
+++ b/source/blender/editors/curve/editcurve_paint.c
@@ -1072,7 +1072,7 @@ static int curve_draw_invoke(bContext *C, wmOperator *op, const wmEvent *event)
     const float *plane_no = NULL;
     const float *plane_co = NULL;
 
-    if ((cu->flag & CU_3D) == 0) {
+    if (CU_IS_2D(cu)) {
       /* 2D overrides other options */
       plane_co = obedit->obmat[3];
       plane_no = obedit->obmat[2];