Add scripts to convert .blend to glT

Goodbye Makefile, hello tup!

models/Tupfile

@@ -0,0 +1,3 @@
+MODELS = hedgehog.blend \
+	flag.blend
+: foreach $(MODELS) |> blender %f --background --python ../scripts/bpy/blend2glb.py -- --output %o > /dev/null |> %B.glb

scripts/bpy/blend2glb.py

@@ -0,0 +1,39 @@
+import sys
+import os
+import argparse
+import bpy
+
+# get all args after "--"
+argv = sys.argv
+argv = argv[argv.index("--") + 1:]
+
+parser = argparse.ArgumentParser()
+parser.add_argument('-o','--output')
+
+args = parser.parse_args(argv)
+basedir = os.path.dirname(args.output)
+if basedir is not '':
+    os.makedirs(basedir, exist_ok=True)
+
+# You can read the documentation at:
+# https://github.com/KhronosGroup/glTF-Blender-Exporter/blob/master/docs/user.md
+bpy.ops.export_scene.glb(filepath=args.output,
+                         # Embedding
+                         export_copyright="Zenly",
+                         # Nodes
+                         export_selected=False,
+                         export_layers=True,
+                         export_extras=True,
+                         # Mesh
+                         export_apply=True,
+                         # Attributes
+                         export_texcoords=True,
+                         export_normals=True,
+                         export_tangents=True,
+                         export_colors=True,
+                         # Objects
+                         export_materials=True,
+                         export_cameras=True,
+                         export_camera_infinite=False,
+                         # Animation
+                         export_animations=True)

scripts/bpy/blend2gltf.py

@@ -0,0 +1,41 @@
+import sys
+import os
+import argparse
+import bpy
+
+# get all args after "--"
+argv = sys.argv
+argv = argv[argv.index("--") + 1:]
+
+parser = argparse.ArgumentParser()
+parser.add_argument('-o','--output')
+
+args = parser.parse_args(argv)
+basedir = os.path.dirname(args.output)
+os.makedirs(basedir, exist_ok=True)
+
+# You can read the documentation at:
+# https://github.com/KhronosGroup/glTF-Blender-Exporter/blob/master/docs/user.md
+bpy.ops.export_scene.gltf(filepath=args.output,
+                          # Embedding
+                          export_copyright="Zenly",
+                          export_embed_buffers=False, # leave binary data in .bin
+                          export_embed_images=False,
+                          export_strip=False,         # JSON not striped
+                          # Nodes
+                          export_selected=False,
+                          export_layers=True,
+                          export_extras=True,
+                          # Mesh
+                          export_apply=False,
+                          # Attributes
+                          export_texcoords=True,
+                          export_normals=True,
+                          export_tangents=True,
+                          export_colors=True,
+                          # Objects
+                          export_materials=True,
+                          export_cameras=True,
+                          export_camera_infinite=False,
+                          # Animation
+                          export_animations=True)