added script to fix texture issue for ycb objects

scripts/fix_ycb_mtl_files.py

@@ -0,0 +1,55 @@
+"""
+Context:
+Loading object models from YCB dataset, using google16k/textured.obj.
+
+Open3D has issues loading the textures of these models, which is due to a white space in the `textured.mtl` file.
+This white space comes right after the filename of the texture image, and Open3D does not recognise "png " as a valid
+image file type.
+This script goes through the mtl files and removes the white space, so that Open3D can properly load the textures.
+"""
+import os
+import argparse
+import re
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('-y', '--ycb_base_path', type=str, default='/home/rudorfem/datasets/ycb-objects',
+                        help='path ycb objects folder')
+    parser.add_argument('-m', '--model_type', type=str, default='google_16k', help='model type, i.e. sub-folder name')
+    return parser.parse_args()
+
+
+def remove_whitespace(material_file):
+    with open(material_file, 'r') as infile:
+        data = infile.read()
+
+    # check number of occurrences
+    n = len(re.findall(r'\.png ', data))
+    if n == 0:
+        # nothing to be done here
+        return
+
+    if n > 1:
+        print(f'{n} occurrences of ".png " found in {material_file}, please check manually.')
+        return
+
+    data = data.replace('.png ', '.png')
+    with open(material_file, 'w') as outfile:
+        outfile.write(data)
+
+
+def traverse_ycb_objects(ycb_base_path, model_type):
+    object_names = sorted([x for x in os.listdir(ycb_base_path) if os.path.isdir(os.path.join(ycb_base_path, x))])
+    for name in object_names:
+        print(name)
+        material_file = os.path.join(ycb_base_path, name, model_type, 'textured.mtl')
+        if not os.path.isfile(material_file):
+            print(f'WARNING: found shape {name} but it does not have a {model_type}/textured.mtl file. Skipping.')
+            continue
+        remove_whitespace(material_file)
+
+
+if __name__ == '__main__':
+    opt = parse_args()
+    traverse_ycb_objects(opt.ycb_base_path, opt.model_type)