Implement Mesh partitioning

assets/audi_r8/Audi_R8_2017.mtl

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+# Blender MTL File: 'Audi_R8_2017.blend'
+# Material Count: 31
+
+newmtl AirBackOutput
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl AudiLogoChrome
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Axe
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl BlackGlossy
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl BodyMaterials(00297F)
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.160784 0.498039
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Bolt(Black)
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Brake
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.100000 0.100000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl BrakeDisc
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.100000 0.100000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl CarbonFibre
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.150000 0.150000 0.150000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Centre(Black)
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl FarLight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl FrontHighlightChrome
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl GlassBackHighlight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.100000 0.100000 0.120000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl GlassFrontHighlight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.100000 0.100000 0.120000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Ground
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl HoneyComb
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl InteriorFrontHighlight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl LightBackHighlight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl LightFrontHighlight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl LightSource
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Mirrors
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl MirrorsLightSouces
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl NumberPlateLight
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl NumbrePlateAudiR8
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Kd NumernSchildAudiR8.png
+
+newmtl Ring(Light)
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl RoofCanvas
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl Tyre
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.030000 0.030000 0.030000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl WheelsChrome
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl WindscreenGlassBlack
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl WindscreenGlassGrey
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.100000 0.100000 0.120000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl undercarriage
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.050000 0.050000 0.050000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2

assets/audi_r8/source_attribution.txt

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+Model by hermes25, from: https://free3d.com/3d-model/audi-r8-spyder-22646.html
+
+Modified material for easier lighting and diffuse colors

assets/mtl_converter.py

@@ -0,0 +1,76 @@
+import argparse
+import re
+import os
+import sys
+
+
+COLOR_RULES = {
+    "black": "0.05 0.05 0.05", "dark": "0.15 0.15 0.15", "grey": "0.5 0.5 0.5",
+    "white": "0.9 0.9 0.9", "chrome": "0.8 0.8 0.8", "metal": "0.7 0.7 0.7",
+    "silver": "0.75 0.75 0.75", "gold": "0.8 0.7 0.2", "copper": "0.7 0.4 0.2",
+    "glass": "0.1 0.1 0.12", "window": "0.1 0.1 0.12", "mirror": "0.9 0.9 0.9",
+    "tyre": "0.03 0.03 0.03", "tire": "0.03 0.03 0.03", "rubber": "0.03 0.03 0.03",
+    "wood": "0.4 0.25 0.1", "carbon": "0.15 0.15 0.15", "plastic": "0.8 0.8 0.8",
+    "red": "0.8 0.1 0.1", "green": "0.1 0.8 0.1", "blue": "0.1 0.1 0.8",
+    "yellow": "0.8 0.8 0.1"
+}
+
+
+def hex_to_kd(hex_str):
+    r, g, b = int(hex_str[0:2], 16), int(hex_str[2:4], 16), int(hex_str[4:6], 16)
+    return f"{r/255.0:.6f} {g/255.0:.6f} {b/255.0:.6f}"
+
+
+def get_color(name):
+    match = re.search(r'\(([A-Fa-f0-9]{6})\)', name)
+    if match:
+        return hex_to_kd(match.group(1))
+
+    name_lower = name.lower()
+    for kw, kd in COLOR_RULES.items():
+        if kw in name_lower: return kd
+    return None
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Auto-fix missing Kd colors in MTL files based on material names.")
+    parser.add_argument("input", help="Path to the input .mtl file")
+    parser.add_argument("-o", "--output", help="Path to output file (default: <input>_fixed.mtl)")
+    parser.add_argument("-w", "--overwrite", action="store_true", help="Overwrite the input file directly")
+    args = parser.parse_args()
+
+    if not os.path.exists(args.input):
+        print(f"Error: {args.input} not found.")
+        sys.exit(1)
+
+    with open(args.input, 'r') as f:
+        lines = f.readlines()
+
+    out_lines = []
+    current_mat = ""
+    changes = 0
+
+    for line in lines:
+        if line.startswith("newmtl "):
+            current_mat = line.split()[1].strip()
+            out_lines.append(line)
+        elif line.startswith("Kd ") and current_mat:
+            new_kd = get_color(current_mat)
+            if new_kd:
+                out_lines.append(f"Kd {new_kd}\n")
+                changes += 1
+            else:
+                out_lines.append(line)
+        else:
+            out_lines.append(line)
+
+    out_path = args.input if args.overwrite else (args.output or args.input.replace(".mtl", "_fixed.mtl"))
+
+    with open(out_path, 'w') as f:
+        f.writelines(out_lines)
+
+    print(f"Done! {changes} materials updated. Saved to {out_path}")
+
+
+if __name__ == "__main__":
+    main()