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59 lines
1.9 KiB
59 lines
1.9 KiB
2 years ago
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import struct
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from typing import BinaryIO, Optional
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import numpy as np
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from shap_e.util.io import buffered_writer
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def write_ply(
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raw_f: BinaryIO,
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coords: np.ndarray,
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rgb: Optional[np.ndarray] = None,
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faces: Optional[np.ndarray] = None,
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):
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"""
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Write a PLY file for a mesh or a point cloud.
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:param coords: an [N x 3] array of floating point coordinates.
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:param rgb: an [N x 3] array of vertex colors, in the range [0.0, 1.0].
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:param faces: an [N x 3] array of triangles encoded as integer indices.
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"""
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with buffered_writer(raw_f) as f:
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f.write(b"ply\n")
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f.write(b"format binary_little_endian 1.0\n")
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f.write(bytes(f"element vertex {len(coords)}\n", "ascii"))
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f.write(b"property float x\n")
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f.write(b"property float y\n")
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f.write(b"property float z\n")
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if rgb is not None:
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f.write(b"property uchar red\n")
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f.write(b"property uchar green\n")
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f.write(b"property uchar blue\n")
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if faces is not None:
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f.write(bytes(f"element face {len(faces)}\n", "ascii"))
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f.write(b"property list uchar int vertex_index\n")
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f.write(b"end_header\n")
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if rgb is not None:
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rgb = (rgb * 255.499).round().astype(int)
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vertices = [
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(*coord, *rgb)
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for coord, rgb in zip(
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coords.tolist(),
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rgb.tolist(),
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)
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]
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format = struct.Struct("<3f3B")
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for item in vertices:
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f.write(format.pack(*item))
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else:
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format = struct.Struct("<3f")
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for vertex in coords.tolist():
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f.write(format.pack(*vertex))
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if faces is not None:
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format = struct.Struct("<B3I")
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for tri in faces.tolist():
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f.write(format.pack(len(tri), *tri))
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