add pbrt v4 converter

convert_pbrt-v4.py

@@ -0,0 +1,29 @@
+import os
+import subprocess
+from pathlib import Path
+import argparse
+
+parser = argparse.ArgumentParser(description="Convert pbrt 4 files of folder into another one")
+
+parser.add_argument('--previous', type=str, help='previous pbrt folder', required=True)
+parser.add_argument('--new', type=str, help='new pbrt folder (with all copy)', required=True)
+parser.add_argument('--pbrt', type=str, help='pbrt executable', required=True)
+
+args = parser.parse_args()
+
+p_previous = args.previous
+p_new      = args.new
+p_pbrt     = args.pbrt
+
+
+command = p_pbrt + " --upgrade {0} > {1}"
+
+os.system('cp -r {0} {1}'.format(p_previous, p_new))
+
+for path in Path(p_previous).rglob('*.pbrt'):
+    elements = str(path).split('/')
+    head = elements[0]
+    del elements[0]
+    print(path, '=>', p_new)
+    str_command = command.format(path, os.path.join(p_new, os.path.split(path)[-1]))
+    subprocess.call(str_command, shell=True)