merge_fragments.py

import os
import glob
import sys
import shutil
import trimesh

# Helper script for optional merging
# of fragments into the original
# broken/repair meshes
#
# Call this as 
#
# 	python3 merge_fragments.py [outfilepath] / [dirpath]"
#
# where outfilepath is the full path to the mesh (model_x_[N].ply)
# x is either b for the broken mesh or r for the repair mesh
# N is a number from 0 to N_max, corresponding to the number of 
# subtractions performed (N_max is 3 for jars and bottles, 10 for mugs,
# and 1 for other classes
#
# The script searches for all fragments corresponding to model_x_[N].ply,
# i.e., all files of the form model_x_[N]_fragment_[M].ply, where M = {0,1,2...}
# and merges them using the 'trimesh' package
#
# Examples (assuming merge_fragments.py is in root folder containing all class folders)
#
# For a single file:
#	python3 merge_fragments.py ./03593526/e4c871d1d5e3c49844b2fa2cac0778f5/models/model_b_1.ply
# For all models in an object folder: 
#	python3 merge_fragments.py ./03593526/e4c871d1d5e3c49844b2fa2cac0778f5
# For all models in a class: 
#	python3 merge_fragments.py ./03593526
# For all models:
#	python3 merge_fragments.py ./
# 
# 
# THE FOLLOWING PACKAGE MUST BE PRE-INSTALLED PRIOR TO USING THIS SCRIPT: trimesh
#
# Author: Natasha Kholgade Banerjee

def merge_fragments_runner( outfilepath, show_output=True ):
	
	# Search for all fragments
	fragmentfiles = glob.glob( outfilepath.replace( ".ply", "_fragment_*.ply" ) )
	if not fragmentfiles:
		if show_output:
			print( f"No fragments found for {outfilepath}" )
	else:
		if show_output:
			print( "Merging following fragment files found for {outfilepath}:" )
			print( fragmentfiles )
		
		if len( fragmentfiles ) == 1:
			# If only one fragment file, simply copy it over
			shutil.copy2( fragmentfiles[0], outfilepath )
			
		else:		
			# Load in all the fragment files as trimesh meshes
			meshes = [trimesh.load( fragmentfile ) for fragmentfile in fragmentfiles]
		
			# Concatenate all meshes into a single mesh using the concatenate function in trimesh
			mesh = trimesh.util.concatenate( meshes )
		
			# Export the concatenated mesh to {outfilepath}
			mesh.export( outfilepath )

if __name__ == "__main__":
	if len(sys.argv) != 2:
		print("Usage: python3 merge_fragments.py [outfilepath] / [dirpath]")
		print( "File Example: python3 merge_fragments.py ./03593526/e4c871d1d5e3c49844b2fa2cac0778f5/models/model_b_1.ply")
		print( "Directory Examples (LAST TWO ARE TIME-INTENSIVE):" )
		print( "For all models in an object folder: python3 merge_fragments.py ./03593526/e4c871d1d5e3c49844b2fa2cac0778f5" )
		print( "For all models in a class: python3 merge_fragments.py ./03593526" )
		print( "For all models: python3 merge_fragments.py ./" )
	else:
		file_or_dir_path = sys.argv[1]
		if os.path.isfile( file_or_dir_path ):
			print( "Provided single file" )
			merge_fragments_runner( file_or_dir_path )
		else:
			print( "Provided directory" )
			N_max = 10			
			for root, subdirs, files in os.walk( file_or_dir_path ):
				for i in range( 0, N_max ):
					for suffix in ["b", "r"]:
						path = os.path.join( root, f"model_{suffix}_{i}.ply" )
						path_fragment = os.path.join( root, f"model_{suffix}_{i}_fragment_0.ply" )
						if os.path.isfile( path_fragment ):
							merge_fragments_runner( path )