UnityのMaskmapをMetallic/Occlusion/Detail Mapに変換するスクリプト

maskmap2builtinshadermaps.py

from pathlib import Path

import numpy as np

from PIL import Image


def open_maskmap(path: Path) -> np.ndarray:
    img = Image.open(path)
    return np.asarray(img)

def mask2metallic(maskmap: np.ndarray) -> Image.Image:
    metallic = np.dstack([maskmap[:, :, 0], maskmap[:, :, 3]])
    return Image.fromarray(metallic, "LA")

def mask2occlusion(maskmap: np.ndarray) -> Image.Image:
    occlusion = maskmap[:, :, 1]
    return Image.fromarray(occlusion, "L")

def mask2detail(maskmap: np.ndarray) -> Image.Image:
    detail = maskmap[:, :, 2]
    return Image.fromarray(detail, "L")


if __name__ == "__main__":
    # ここら辺は各自の環境で書き換える
    parent_folder = Path(r"/path/to/Textures")
    for child_folder in parent_folder.iterdir():
        for p in child_folder.glob("*_MaskMap.png"):
            mask = open_maskmap(p)
            metallic = mask2metallic(mask)
            metallic.save(child_folder / p.name.replace("MaskMap", "MetallicMap"))
            occlusion = mask2occlusion(mask)
            occlusion.save(child_folder / p.name.replace("MaskMap", "OcclusionMap"))
            detail = mask2detail(mask)
            detail.save(child_folder / p.name.replace("MaskMap", "DetailMap"))