fix submesh overlap

terrain_mesh_extractor/ExtractTerrainMeshes.py

@@ -8,7 +8,14 @@ dongpath = r'C:\Users\gents\AppData\LocalLow\Unity\Web Player\Cache\Fusionfall'
 env = UnityEnvironment(base_path=dongpath)
 outpath = r'C:\Users\gents\3D Objects\FFTerrainMeshes'
 
-def rip_terrain_mesh(f, outpath):
+def uvs_from_vert(uv_layer, v):
+    uvs = []
+    for l in v.link_loops:
+        uv_data = l[uv_layer]
+        uvs.append(uv_data.uv)
+    return uvs
+
+def rip_terrain_mesh(f, outpath, clear=False):
     dong = Asset.from_file(f, environment=env)
 
     for k, v in dong.objects.items():
@@ -25,12 +32,6 @@ def rip_terrain_mesh(f, outpath):
             context = bpy.context
             grid = context.edit_object
 
-            # apply triangulate modifier
-            mod = grid.modifiers.new("Triangulate", 'TRIANGULATE')
-            mod.quad_method = 'FIXED' # triangle orientation
-            bpy.ops.object.mode_set(mode='OBJECT')
-            bpy.ops.object.modifier_apply(modifier="Triangulate")
-
             bpy.ops.object.mode_set(mode='EDIT')
             bm = bmesh.from_edit_mesh(context.edit_object.data)
             bm.verts.ensure_lookup_table()
@@ -48,6 +49,8 @@ def rip_terrain_mesh(f, outpath):
 
             indices = []
             shift_amt = abs(bm.verts[0].co.x - bm.verts[1].co.x)
+            uv_layer = bm.loops.layers.uv.active
+            uv_shift_amt = 1 / 256
             # gather m_Shifts positions
             for shift in terrainData['m_Heightmap']['m_Shifts']:
                 shift_index = shift['y'] + shift['x'] * 129
@@ -56,12 +59,30 @@ def rip_terrain_mesh(f, outpath):
                 flags = shift['flags'] # bits: +X -X +Y -Y
                 if flags & 0b1000: # +X
                     v.co.x += shift_amt
+                    for uv in uvs_from_vert(uv_layer, v):
+                        uv.x += uv_shift_amt
                 if flags & 0b0100: # -X
                     v.co.x -= shift_amt
+                    for uv in uvs_from_vert(uv_layer, v):
+                        uv.x -= uv_shift_amt
                 if flags & 0b0010: # +Y
                     v.co.y += shift_amt
+                    for uv in uvs_from_vert(uv_layer, v):
+                        uv.y += uv_shift_amt
                 if flags & 0b0001: # -Y
                     v.co.y -= shift_amt
+                    for uv in uvs_from_vert(uv_layer, v):
+                        uv.y -= uv_shift_amt
+
+            # apply triangulate modifier
+            mod = grid.modifiers.new("Triangulate", 'TRIANGULATE')
+            mod.quad_method = 'FIXED' # triangle orientation
+            bpy.ops.object.mode_set(mode='OBJECT')
+            bpy.ops.object.modifier_apply(modifier="Triangulate")
+
+            bpy.ops.object.mode_set(mode="EDIT")
+            bm = bmesh.from_edit_mesh(context.edit_object.data)
+            bm.verts.ensure_lookup_table()
 
             # flip diagonally
             for v in bm.verts:
@@ -73,27 +94,47 @@ def rip_terrain_mesh(f, outpath):
             for f in bm.faces:
                 f.normal_flip()
 
-            # export
+            # select vertex chunks and separate
+            verts = {}
+            for x in range(129):
+                for y in range(129):
+                    idx = y + x * 129
+                    v = bm.verts[idx]
+                    verts[idx] = v
+                    v.select = False
+                    for f in v.link_faces:
+                        f.select = False
+            chunk_size = 8
+            for x in range(128 // chunk_size):
+                for y in range(128 // chunk_size):
+                    for i in range(x * chunk_size, x * chunk_size + chunk_size + 1):
+                        for j in range(y * chunk_size, y * chunk_size + chunk_size + 1):
+                            idx = j + i * 129
+                            v = verts[idx]
+                            v.select = True
+                    bm.select_mode = {'VERT', 'EDGE', 'FACE'}
+                    bm.select_flush_mode()
+                    bpy.context.tool_settings.mesh_select_mode = (False, False, True)
+                    bpy.ops.mesh.duplicate()
+                    bpy.ops.mesh.separate(type='SELECTED')
+                    bpy.ops.mesh.select_all(action='DESELECT')
+
+            # delete main
             bpy.ops.object.mode_set(mode="OBJECT")
+            bpy.ops.object.select_all(action='DESELECT')
+            grid.select_set(True)
+            bpy.ops.object.delete()
+
+            # export
             bpy.ops.object.select_all(action='SELECT')
             name = terrainData['m_Name']
             outfile = f"{name}.obj"
             bpy.ops.export_scene.obj(filepath=os.path.join(outpath, outfile))
-
-            # select modified vertices
-            #bpy.ops.object.mode_set(mode="EDIT")
-            #bm = bmesh.from_edit_mesh(context.edit_object.data)
-            #bm.verts.ensure_lookup_table()
-            #for v in bm.verts:
-            #    v.select = False
-            #for shift_index in indices:
-            #    v = bm.verts[shift_index]
-            #    v.select = True
             
-            # clear the scene
-            bpy.ops.object.mode_set(mode="OBJECT")
-            bpy.ops.object.select_all(action='SELECT')
-            bpy.ops.object.delete()
+            if(clear):
+                bpy.ops.object.mode_set(mode="OBJECT")
+                bpy.ops.object.select_all(action='SELECT')
+                bpy.ops.object.delete()
 
 dongs = os.listdir(dongpath)
 for dongname in dongs: