From 3fe32f5eb2018a0f410e552a8228ed2f182278e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20Br=C3=BCckner?= <mail@moritz-brueckner.de>
Date: Sun, 28 Feb 2021 20:50:08 +0100
Subject: [PATCH] Add script to generate skydome geometry data for Iron

---
 export_skydome_geometry.py | 72 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 export_skydome_geometry.py

diff --git a/export_skydome_geometry.py b/export_skydome_geometry.py
new file mode 100644
index 0000000..5865081
--- /dev/null
+++ b/export_skydome_geometry.py
@@ -0,0 +1,72 @@
+"""
+This script generates the skydome geometry data as stored in
+iron/Sources/iron/data/ConstData.hx.
+
+USAGE:
+    On MacOS/Linux:
+        Open Blender from the terminal to see the console output.
+    On Windows:
+        Open the Blender console via "Window > Toggle System Console".
+
+    Select the skydome object in object mode and run this script. Note
+    that the script flips the normals in the output. The original mesh
+    is not modified.
+
+    After running the script, open the console. If the script ran
+    successfully, the generated vertex data was printed to the console,
+    ready to copy to ConstData.hx.
+"""
+import bmesh
+import bpy
+
+
+def list_representation(lst) -> str:
+    """List to string without spaces."""
+    return f"[{','.join(str(i) for i in lst)}]"
+
+
+def run():
+    obj = bpy.context.object
+
+    if obj is None:
+        print("No object selected, aborting!")
+        return
+
+    if obj.type != "MESH":
+        print(f"Selected object '{obj.name}' is not a mesh, aborting!")
+        return
+
+    bm = bmesh.new()
+    bm.from_mesh(obj.data)
+    bmesh.ops.triangulate(bm, faces=bm.faces[:], quad_method="FIXED")
+
+    indices = []
+    pos = []
+    nor = []
+
+    # Fill index buffer
+    for face in bm.faces:
+        # Turn the normals inside
+        face.normal_flip()
+
+        for vert in face.verts:
+            indices.append(vert.index)
+
+    # Vertex buffer data
+    for vert in bm.verts:
+        pos.extend(vert.co)
+        nor.extend(vert.normal)
+
+    bm.free()
+
+    print("\n====================")
+    print(f"Calculated mesh data for object '{obj.name}':")
+    print(f"Indices: {list_representation(indices)}")
+    print("")
+    print(f"Positions: {list_representation(pos)}")
+    print("")
+    print(f"Normals: {list_representation(nor)}")
+
+
+if __name__ == "__main__":
+    run()