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Executing meshlab from commandline reduce faces of a mesh iteratively
#!/usr/bin/env python
import sys
import os
import subprocess
# Script taken from doing the needed operation
# (Filters > Remeshing, Simplification and Reconstruction >
# Quadric Edge Collapse Decimation, with parameters:
# 0.9 percentage reduction (10%), 0.3 Quality threshold (70%)
# Target number of faces is ignored with those parameters
# conserving face normals, planar simplification and
# post-simplimfication cleaning)
# And going to Filter > Show current filter script
filter_script_mlx = """<!DOCTYPE FilterScript>
<FilterScript>
<filter name="Quadric Edge Collapse Decimation">
<Param type="RichInt" value="1448" name="TargetFaceNum"/>
<Param type="RichFloat" value="0.9" name="TargetPerc"/>
<Param type="RichFloat" value="0.3" name="QualityThr"/>
<Param type="RichBool" value="false" name="PreserveBoundary"/>
<Param type="RichFloat" value="1" name="BoundaryWeight"/>
<Param type="RichBool" value="true" name="PreserveNormal"/>
<Param type="RichBool" value="false" name="PreserveTopology"/>
<Param type="RichBool" value="false" name="OptimalPlacement"/>
<Param type="RichBool" value="true" name="PlanarQuadric"/>
<Param type="RichBool" value="false" name="QualityWeight"/>
<Param type="RichBool" value="true" name="AutoClean"/>
<Param type="RichBool" value="false" name="Selected"/>
</filter>
</FilterScript>
"""
def create_tmp_filter_file(filename='filter_file_tmp.mlx'):
with open('/tmp/' + filename, 'w') as f:
f.write(filter_script_mlx)
return '/tmp/' + filename
def reduce_faces(in_file, out_file,
filter_script_path=create_tmp_filter_file()):
# Add input mesh
command = "meshlabserver -i " + in_file
# Add the filter script
command += " -s " + filter_script_path
# Add the output filename and output flags
command += " -o " + out_file + " -om vn fn"
# Execute command
print "Going to execute: " + command
output = subprocess.check_output(command, shell=True)
last_line = output.splitlines()[-1]
print
print "Done:"
print in_file + " > " + out_file + ": " + last_line
if __name__ == '__main__':
if len(sys.argv) < 3:
print "Usage:"
print sys.argv[0] + " /path/to/input_mesh num_iterations"
print "For example, reduce 10 times:"
print sys.argv[0] + " /home/myuser/mymesh.dae 10"
exit(0)
in_mesh = sys.argv[1]
filename = in_mesh.split('/')[-1]
num_iterations = int(sys.argv[2])
folder_name = filename.replace('.', '_')
tmp_folder_name = '/tmp/' + folder_name + '_meshes/'
print "Input mesh: " + in_mesh + " (filename: " + filename + ")"
print "Num iterations: " + str(num_iterations)
print "Output folder: " + tmp_folder_name
try:
os.mkdir(tmp_folder_name)
except OSError as e:
print >> sys.stderr, "Exception creating folder for meshes: " + str(e)
exit(0)
for it in range(1, num_iterations):
if it == 1:
out_mesh = tmp_folder_name + folder_name + "_it" + str(it) + ".dae"
reduce_faces(in_mesh, out_mesh)
else:
out_mesh = tmp_folder_name + folder_name + "_it" + str(it) + ".dae"
reduce_faces(last_out_mesh, out_mesh)
last_out_mesh = out_mesh
print
print "Done reducing, find the files at: " + tmp_folder_name
@tylerlindell

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@tylerlindell tylerlindell commented Jan 11, 2018

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