6 files changed, 22 insertions, 2 deletions
diff --git a/source/blender/bmesh/intern/bmesh_opdefines.c b/source/blender/bmesh/intern/bmesh_opdefines.c
index 7865c79323d..85ea27b0f4e 100644
--- a/source/blender/bmesh/intern/bmesh_opdefines.c
+++ b/source/blender/bmesh/intern/bmesh_opdefines.c
@@ -1186,6 +1186,7 @@ static BMO_FlagSet bmo_enum_triangulate_quad_method[] = {
   {MOD_TRIANGULATE_QUAD_FIXED, "FIXED"},
   {MOD_TRIANGULATE_QUAD_ALTERNATE, "ALTERNATE"},
   {MOD_TRIANGULATE_QUAD_SHORTEDGE, "SHORT_EDGE"},
+  {MOD_TRIANGULATE_QUAD_LONGEDGE, "LONG_EDGE"},
   {0, NULL},
 };
 
diff --git a/source/blender/bmesh/intern/bmesh_polygon.c b/source/blender/bmesh/intern/bmesh_polygon.c
index e9eaf865e3c..e7280303c26 100644
--- a/source/blender/bmesh/intern/bmesh_polygon.c
+++ b/source/blender/bmesh/intern/bmesh_polygon.c
@@ -1007,6 +1007,7 @@ void BM_face_triangulate(BMesh *bm,
           break;
         }
         case MOD_TRIANGULATE_QUAD_SHORTEDGE:
+        case MOD_TRIANGULATE_QUAD_LONGEDGE:
         case MOD_TRIANGULATE_QUAD_BEAUTY:
         default: {
           BMLoop *l_v3, *l_v4;
@@ -1023,6 +1024,12 @@ void BM_face_triangulate(BMesh *bm,
             d2 = len_squared_v3v3(l_v1->v->co, l_v3->v->co);
             split_24 = ((d2 - d1) > 0.0f);
           }
+          else if (quad_method == MOD_TRIANGULATE_QUAD_LONGEDGE) {
+            float d1, d2;
+            d1 = len_squared_v3v3(l_v4->v->co, l_v2->v->co);
+            d2 = len_squared_v3v3(l_v1->v->co, l_v3->v->co);
+            split_24 = ((d2 - d1) < 0.0f);
+          }
           else {
             /* first check if the quad is concave on either diagonal */
             const int flip_flag = is_quad_flip_v3(
diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index fc041e257b0..1d0796bda8b 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -1852,6 +1852,7 @@ enum {
   MOD_TRIANGULATE_QUAD_FIXED = 1,
   MOD_TRIANGULATE_QUAD_ALTERNATE = 2,
   MOD_TRIANGULATE_QUAD_SHORTEDGE = 3,
+  MOD_TRIANGULATE_QUAD_LONGEDGE = 4,
 };
 
 typedef struct LaplacianSmoothModifierData {
diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h
index 29d61bcf2ff..114e350b582 100644
--- a/source/blender/makesdna/DNA_node_types.h
+++ b/source/blender/makesdna/DNA_node_types.h
@@ -2118,6 +2118,7 @@ typedef enum GeometryNodeTriangulateQuads {
   GEO_NODE_TRIANGULATE_QUAD_FIXED = 1,
   GEO_NODE_TRIANGULATE_QUAD_ALTERNATE = 2,
   GEO_NODE_TRIANGULATE_QUAD_SHORTEDGE = 3,
+  GEO_NODE_TRIANGULATE_QUAD_LONGEDGE = 4,
 } GeometryNodeTriangulateQuads;
 
 typedef enum GeometryNodePointInstanceType {
diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index d46ae13b482..0f0734c8448 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -331,7 +331,12 @@ const EnumPropertyItem rna_enum_modifier_triangulate_quad_method_items[] = {
      "SHORTEST_DIAGONAL",
      0,
      "Shortest Diagonal",
-     "Split the quads based on the distance between the vertices"},
+     "Split the quads along their shortest diagonal"},
+    {MOD_TRIANGULATE_QUAD_LONGEDGE,
+     "LONGEST_DIAGONAL",
+     0,
+     "Longest Diagonal",
+     "Split the quads along their longest diagonal"},
     {0, NULL, 0, NULL, NULL},
 };
 
diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index e7307e6e058..ecbeadf1fa4 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -9488,7 +9488,12 @@ static void def_geo_triangulate(StructRNA *srna)
        "SHORTEST_DIAGONAL",
        0,
        "Shortest Diagonal",
-       "Split the quads based on the distance between the vertices"},
+       "Split the quads along their shortest diagonal"},
+      {GEO_NODE_TRIANGULATE_QUAD_LONGEDGE,
+       "LONGEST_DIAGONAL",
+       0,
+       "Longest Diagonal",
+       "Split the quads along their longest diagonal"},
       {0, NULL, 0, NULL, NULL},
   };