[错误]: glTF alphaCutoff 从未被读取,因此 MASK 材质被导入为 BLEND

import io import tempfile from pathlib import Path import numpy as np import pygltflib from PIL import Image import genesis as gs from genesis.utils.gltf import parse_mesh_glb

One row of pixels whose alpha ramp up, the shape a foliage or fence cutout has along its edge.

ALPHA = np.array([[0, 64, 128, 192, 255]], dtype=np.uint8) POSITIONS = np.array([[0.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, 1.0, 0.0]], dtype=np.float32) UVS = np.array([[0.0, 0.0], [1.0, 0.0], [0.0, 1.0]], dtype=np.float32)

def write_glb(path, alpha_mode, alpha_cutoff): rgba = np.full((1, ALPHA.shape[1], 4), 255, dtype=np.uint8) rgba[..., 3] = ALPHA buffer = io.BytesIO() Image.fromarray(rgba, mode="RGBA").save(buffer, format="PNG")

blob = b""
buffer_views = []
for data in (buffer.getvalue(), POSITIONS.tobytes(), UVS.tobytes()):
    blob += b"\x00" * ((4 - len(blob) % 4) % 4)
    buffer_views.append(pygltflib.BufferView(buffer=0, byteOffset=len(blob), byteLength=len(data)))
    blob += data