From fbbcf115a9dbb2ee187582e74e72c53c51692c33 Mon Sep 17 00:00:00 2001
From: poikilos <7557867+poikilos@users.noreply.github.com>
Date: Sat, 7 Jan 2023 18:33:39 -0500
Subject: [PATCH] Create and add a model separation script.

---
 .../blender/separate_chunks_of_huge_model.py  | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 utilities/blender/separate_chunks_of_huge_model.py

diff --git a/utilities/blender/separate_chunks_of_huge_model.py b/utilities/blender/separate_chunks_of_huge_model.py
new file mode 100644
index 0000000..8441d82
--- /dev/null
+++ b/utilities/blender/separate_chunks_of_huge_model.py
@@ -0,0 +1,80 @@
+import bpy
+
+# in Namaman, the chunk for Darkhorn is near 599000, 410000 to around 685000, 496000
+# (chunk_col = 6, chunk_row = 4, chunk_size = 100000
+chunk_size = 100000
+epsilon = .1
+for chunk_col in range(10):
+    for chunk_row in range(10):
+        chunk_left = chunk_col * chunk_size - epsilon
+        chunk_right = (chunk_col+1) * chunk_size + epsilon
+        # Lower number is bottom since cartesian:
+        chunk_bottom = chunk_row * chunk_size - epsilon
+        chunk_top = (chunk_row+1) * chunk_size + epsilon
+        bpy.ops.wm.tool_set_by_id(name="builtin.scale")
+        #clear scene, make mesh
+        #bpy.ops.object.mode_set(mode = 'OBJECT')
+        #bpy.ops.object.select_all(action='SELECT')
+        #bpy.ops.object.delete(use_global=False)
+        #bpy.ops.mesh.primitive_cube_add(size=2, enter_editmode=False, align='WORLD', location=(0, 0, 0), rotation=(1.5708, 1.5708, 0))
+        #obj = bpy.data.objects["Cube"]
+        obj = bpy.context.object
+
+
+        #select vertex
+        obj = bpy.context.active_object
+        bpy.ops.object.mode_set(mode = 'EDIT')
+        bpy.ops.mesh.select_mode(type="VERT")
+        #bpy.ops.mesh.select_mode(type="EDGE")
+        # bpy.ops.mesh.select_mode(type="FACE")
+        bpy.ops.mesh.select_all(action = 'DESELECT')
+        bpy.ops.object.mode_set(mode = 'OBJECT')
+        # for i in range(len(bpy.context.object.data.vertices)):
+        for i in range(len(obj.data.vertices)):
+            # dir(obj.data.vertices[i])
+            obj.data.vertices[i].select = False
+            #obj.data.edges[7].select = True
+            #obj.data.polygons[2].select = True
+            v = obj.data.vertices[i]
+            if v.co.x < chunk_left:
+                continue
+            if v.co.x > chunk_right:
+                continue
+            if v.co.y < chunk_bottom:
+                continue
+            if v.co.y > chunk_top:
+                continue
+            # v.select_set(False)
+            obj.data.vertices[i].select = True
+
+        bpy.ops.object.mode_set(mode = 'EDIT')
+        bpy.ops.mesh.separate(type='SELECTED')
+
+'''makes a dumb square every time for some reason
+import bmesh  # for selecting in edit mode
+# https://blender.stackexchange.com/a/188323
+context = bpy.context
+
+bpy.ops.mesh.primitive_plane_add(
+        enter_editmode=True)
+ob = context.object
+me = ob.data
+bm = bmesh.from_edit_mesh(me)
+
+for i, v in enumerate(bm.verts):
+    v.select_set(False)
+    if v.co.x < chunk_left:
+        continue
+    if v.co.x > chunk_right:
+        continue
+    if v.co.y < chunk_bottom:
+        continue
+    if v.co.y > chunk_top:
+        continue
+    v.select_set(True)
+
+bm.select_mode |= {'VERT'}
+bm.select_flush_mode()
+
+bmesh.update_edit_mesh(me)
+'''