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Merge pull request #160 from vpython/Binary-stl-convertor
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# UINT8[80] – Header - 80 bytes | ||
# UINT32 – Number of triangles - 4 bytes | ||
# foreach triangle - 50 bytes: | ||
# REAL32[3] – Normal vector - 12 bytes | ||
# REAL32[3] – Vertex 1 - 12 bytes | ||
# REAL32[3] – Vertex 2 - 12 bytes | ||
# REAL32[3] – Vertex 3 - 12 bytes | ||
# UINT16 – Attribute byte count - 2 bytes | ||
# end | ||
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from vpython import * | ||
import struct | ||
from collections import namedtuple | ||
import numpy as np | ||
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Ctypes = namedtuple('Ctype', ['fmt', 'size']) | ||
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Ctype_names = ['char', 'signed char', 'unsigned char', '_Bool', 'short', \ | ||
'unsigned short', 'int', 'unsigned int', 'long', 'unsigned long',\ | ||
'long long', 'unsigned long long', 'float', 'double', 'char[]'] | ||
Ctype_sizes = [1, 1, 1, 1, 2,\ | ||
2, 4, 4, 4, 4,\ | ||
8, 8, 4, 8, -1] | ||
Ctype_formats = ['c', 'b', 'B', '?', 'h',\ | ||
'H', 'i', 'I', 'l', 'L',\ | ||
'q', 'Q', 'f', 'd', 's'] | ||
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Ctype_dict = {} | ||
for i, name in enumerate(Ctype_names): | ||
Ctype_dict[name] = Ctypes(Ctype_formats[i], Ctype_sizes[i]) | ||
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def binary_reader(fid, Ctype, **opts): | ||
assert Ctype in Ctype_dict, "Ctype not found in Ctype_dict" | ||
if Ctype == 'char[]': | ||
string = [] | ||
for ch in range(opts['size']): | ||
char = struct.unpack(Ctype_dict['char'].fmt, fid.read(Ctype_dict['char'].size))[0] | ||
if chr(0).encode('utf-8') not in char: | ||
string.append(char.decode('utf-8')) | ||
else: | ||
string.append(' ') | ||
return ''.join(string) | ||
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if Ctype == 'char': | ||
return ord(struct.unpack(Ctype_dict[Ctype].fmt, fid.read(Ctype_dict[Ctype].size))[0].decode('utf-8')) | ||
return struct.unpack(Ctype_dict[Ctype].fmt, fid.read(Ctype_dict[Ctype].size))[0] | ||
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def stl_to_triangles(filename): | ||
with open(filename, "rb") as f: | ||
header = binary_reader(f,'char[]', size = 80) | ||
numOfTri = binary_reader(f,'unsigned int') | ||
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print(header) | ||
print(numOfTri) | ||
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tris = [] | ||
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for i in range(numOfTri): | ||
vs = [] | ||
x1, x2, x3 = binary_reader(f,'float'), binary_reader(f,'float'), binary_reader(f,'float') | ||
N = vec(x1, x2, x3) | ||
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x1, x2, x3 = binary_reader(f,'float'), binary_reader(f,'float'), binary_reader(f,'float') | ||
p1 = vertex(pos = vec(x1, x2, x3), normal=N, color=color.white) | ||
vs.append(p1) | ||
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x1, x2, x3 = binary_reader(f,'float'), binary_reader(f,'float'), binary_reader(f,'float') | ||
p2 = vertex(pos = vec(x1, x2, x3), normal=N, color=color.white) | ||
vs.append(p2) | ||
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x1, x2, x3 = binary_reader(f,'float'), binary_reader(f,'float'), binary_reader(f,'float') | ||
p3 = vertex(pos = vec(x1, x2, x3), normal=N, color=color.white) | ||
vs.append(p3) | ||
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attr = binary_reader(f,'unsigned short') | ||
tris.append(triangle(vs=vs)) | ||
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return compound(tris) | ||
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if __name__ == '__main__': | ||
filename = r"\convert_stl\Part1_bin.stl" # update this file | ||
man = stl_to_triangles(filename) | ||
man.color = color.orange | ||
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