Image magick script to merge grayscale textures into one image for PBR rendering.

gistfile1.py

#!/usr/bin/python
import optparse
import subprocess
import os

METALNESS_SUFFIX = "_metalness"
ROUGHNESS_SUFFIX = "_rough"
AO_SUFFIX		 = "_ao"
EMISSIVE_SUFFIX  = "_emissive_power"
COLOR_SUFFIX     = "_color"
OUTPUT_SUFFIX	 = "_combined"

def main(options) :
	name, ext    = os.path.splitext(options.inputImage)
	prefix       = name.replace(COLOR_SUFFIX, "")
	metalPath    = prefix + METALNESS_SUFFIX + ext
	roughPath    = prefix + ROUGHNESS_SUFFIX + ext
	aoPath	     = prefix + AO_SUFFIX 		 + ext
	emissivePath = prefix + EMISSIVE_SUFFIX  + ext

	if os.path.isfile(options.inputImage) : 
		output = prefix + OUTPUT_SUFFIX + ext

		subprocess.call(["convert", metalPath, roughPath, emissivePath, aoPath, "-channel", "rgba", "-combine", output])		

if __name__ == "__main__" :
	parser = optparse.OptionParser()

	parser.add_option("-i", "--input-image", dest="inputImage", help="A path to input image", default="./input.png")
	
	options, args = parser.parse_args()

	main(options)