LucaP
582bf6dc43
Phones and the low tier load a decimated grand tourer built by a headless Blender script (31k to 11k faces, same nodes and materials). Desktop gets clearcoat paint and a soft halo parented to the tail bar.
64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
"""Builds the phone LOD of the grand tourer. Headless only:
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blender -b --python scripts/blender/make-lite-car.py -- \
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src/assets/nightdrive-grand-tourer-chromatic.glb \
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src/assets/nightdrive-grand-tourer-lite.glb
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On a phone the car is about 200 px wide and seen from behind, so the wheel
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machining, the tyre treads and the dense trim carry detail nobody can see.
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They are collapsed; the silhouette parts (body, haunches, glass) are kept
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as authored so the car reads the same. Node names and the hierarchy are
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preserved: car.ts finds the wheels, the light bar and the underglow by name.
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"""
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import sys
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import bpy
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source, target = sys.argv[sys.argv.index("--") + 1 :][:2]
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# Fraction of faces kept, by node name prefix (after the "evolution-" prefix).
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RATIOS = {
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"wheel-machining": 0.22,
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"tires": 0.25,
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"body-trim": 0.35,
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"rear-light-bar": 0.4,
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"car-underglow-source": 0.35,
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}
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bpy.ops.wm.read_factory_settings(use_empty=True)
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bpy.ops.import_scene.gltf(filepath=source)
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before = after = 0
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for obj in bpy.data.objects:
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if obj.type != "MESH":
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continue
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name = obj.name.removeprefix("evolution-")
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faces = len(obj.data.polygons)
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before += faces
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ratio = next((r for prefix, r in RATIOS.items() if name.startswith(prefix)), None)
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if ratio is not None and faces > 200:
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# Meshes can be shared between wheels; give each object its own data.
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obj.data = obj.data.copy()
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modifier = obj.modifiers.new("lod", "DECIMATE")
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modifier.decimate_type = "COLLAPSE"
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modifier.ratio = ratio
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modifier.use_collapse_triangulate = True
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bpy.context.view_layer.objects.active = obj
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for other in bpy.context.view_layer.objects:
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other.select_set(other is obj)
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bpy.ops.object.modifier_apply(modifier=modifier.name)
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after += len(obj.data.polygons)
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bpy.ops.export_scene.gltf(
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filepath=target,
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export_format="GLB",
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export_apply=True,
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export_yup=True,
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export_texcoords=False,
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export_normals=True,
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export_materials="EXPORT",
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export_animations=False,
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)
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print(f"LITE faces {before} -> {after}")
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