Compress blender file, save Exporter script from blender

art/Exporter.py

@@ -1,6 +1,7 @@
 import bpy
 import bmesh
 import os
+import shutil
 import struct
 from mathutils import *; from math import *
 from bpy_extras.io_utils import (axis_conversion)
@@ -8,18 +9,33 @@ from bpy_extras.io_utils import (axis_conversion)
 C = bpy.context
 D = bpy.data
 
+LEVEL_EXPORT_NAME = "level"
 EXPORT_DIRECTORY = "exported"
 
-if not os.path.exists(bpy.path.abspath(f"//{EXPORT_DIRECTORY}")):
-    os.makedirs(bpy.path.abspath(f"//{EXPORT_DIRECTORY}"))
+print("\n\nLet's get it started")
+
+if os.path.exists(bpy.path.abspath(f"//{EXPORT_DIRECTORY}")):
+    shutil.rmtree(bpy.path.abspath(f"//{EXPORT_DIRECTORY}"))
+os.makedirs(bpy.path.abspath(f"//{EXPORT_DIRECTORY}"))
 
 
 def write_f32(f, number: float):
     f.write(bytes(struct.pack("f", number)))
 
+
 def write_u64(f, number: int):
     f.write(bytes(struct.pack("Q", number)))
 
+def write_string(f, s: str):
+    encoded = s.encode("utf8")
+    write_u64(f, len(encoded))
+    f.write(encoded)
+
+# for the level.bin 
+level_object_data = []
+collision_cubes = []
+saved_meshes = set()
+
 for o in D.objects:
     mapping = axis_conversion(
         from_forward = "Y",
@@ -27,34 +43,80 @@ for o in D.objects:
         to_forward = "-Z",
         to_up = "Y",
     )
-    mapping.resize_4x4()
-    print(mapping)
-    output_filepath = bpy.path.abspath(f"//{EXPORT_DIRECTORY}/{o.name}.bin")
-    print(f"\n\nExporting {output_filepath}")
-    with open(output_filepath, "wb") as f:
-        bm = bmesh.new()
-        mesh = o.to_mesh()
-        bm.from_mesh(mesh)
-        bmesh.ops.triangulate(bm, faces=bm.faces)
-        bm.transform(mapping)
-        bm.to_mesh(mesh)
-        
-        
-        vertices = []
-
-        for polygon in mesh.polygons:
-            if len(polygon.loop_indices) == 3:
-                for loopIndex in polygon.loop_indices:
-                    loop = mesh.loops[loopIndex]
-                    position = mesh.vertices[loop.vertex_index].undeformed_co
-                    uv = mesh.uv_layers.active.data[loop.index].uv
-                    normal = loop.normal
-                    
-                    vertices.append(position)
-        
-        write_u64(f, len(vertices))
-        for v in vertices:
-            write_f32(f, v.x)
-            write_f32(f, v.y)
-            write_f32(f, v.z)
-        print(f"Wrote {len(vertices)} vertices")
+    mesh_name = o.to_mesh().name # use this over o.name so instanced objects which refer to the same mesh, both use the same serialized mesh.
+    
+    if o.users_collection[0].name == 'Level' and mesh_name == "CollisionCube":
+        collision_cubes.append((o.location, o.dimensions))
+    else:
+        if o.users_collection[0].name == 'Level':
+            print(f"Object {o.name} has mesh name {o.to_mesh().name}")
+            assert(o.rotation_euler.order == 'XYZ')
+            level_object_data.append((mesh_name, mapping @ o.location, o.rotation_euler, o.scale))
+            if mesh_name in saved_meshes:
+                continue
+            saved_meshes.add(mesh_name)
+            
+        
+        mapping.resize_4x4()
+        assert(mesh_name != LEVEL_EXPORT_NAME)
+        output_filepath = bpy.path.abspath(f"//{EXPORT_DIRECTORY}/{mesh_name}.bin")
+        print(f"Exporting {output_filepath}")
+        with open(output_filepath, "wb") as f:
+            bm = bmesh.new()
+            mesh = o.to_mesh()
+            bm.from_mesh(mesh)
+            bmesh.ops.triangulate(bm, faces=bm.faces)
+            bm.transform(mapping)
+            bm.to_mesh(mesh)
+            
+            
+            vertices = []
+
+            for polygon in mesh.polygons:
+                if len(polygon.loop_indices) == 3:
+                    for loopIndex in polygon.loop_indices:
+                        loop = mesh.loops[loopIndex]
+                        position = mesh.vertices[loop.vertex_index].undeformed_co
+                        uv = mesh.uv_layers.active.data[loop.index].uv
+                        normal = loop.normal
+                        
+                        vertices.append((position, uv))
+            
+            write_u64(f, len(vertices))
+            for v_and_uv in vertices:
+                v, uv = v_and_uv
+                write_f32(f, v.x)
+                write_f32(f, v.y)
+                write_f32(f, v.z)
+                write_f32(f, uv.x)
+                write_f32(f, uv.y)
+            print(f"Wrote {len(vertices)} vertices")
+
+with open(bpy.path.abspath(f"//{EXPORT_DIRECTORY}/{LEVEL_EXPORT_NAME}.bin"), "wb") as f:
+    write_u64(f, len(level_object_data))
+    for o in level_object_data:
+        name, v, rotation, scale = o
+        print(f"Writing instanced object {name}")
+        write_string(f, name)
+        write_f32(f, v.x)
+        write_f32(f, v.y)
+        write_f32(f, v.z)
+        
+        # rotation fields different because y+ is up now
+        write_f32(f, rotation.x)
+        write_f32(f, rotation.y)
+        write_f32(f, rotation.z)
+        
+        write_f32(f, scale.x)
+        write_f32(f, scale.y)
+        write_f32(f, scale.z)
+    
+    write_u64(f, len(collision_cubes))
+    for c in collision_cubes:
+        blender_pos, blender_dims = c
+        write_f32(f,  blender_pos.x)
+        write_f32(f, -blender_pos.y)
+        write_f32(f, blender_dims.x)
+        write_f32(f, blender_dims.y)
+        assert(blender_dims.x > 0.0)
+        assert(blender_dims.y > 0.0)