Install models by running:
cp -R gazebo_apriltag/models/* ~/.gazebo/models/Or, add the full path to gazebo_apriltag/models/ to the GAZEBO_MODEL_PATH environment variable.
Generate additional tag models:
# Edit the following lines in generate.py to create tag models you want
# 45: for i in range(16):
# 46: generator.generate('apriltag-imgs/tag36h11', 'tag36_11_%05d' % i, tag_size)