Poses issue when adding fixed_pose engine in the gen_grid_map.ipynb

[GimpelZhang]

Hi all,

hope this issue will not bother you, since this project is still under development.

But in the gen_grid_map.ipynb tutorial, when adding fixed_pose engine in this cell of code:

world_gen.add_engine(
    engine_name='fixed_pose',
    tag='gp_engine',
    models=['box_floor'],
    poses=[[0, 0, -0.005, 0, 0, 0]])

it seems that the "-0.005" z-direction position is not enough to avoid collision for adding the "box_placement" random_pose engine. Therefore no model except for the box_floor occurs in the world, and the following message shows up when requesting the grid map:

2020-04-14 22:13:05,230 | WARNING | occupancy | List of models is empty, cannot compute occupancy grid

[musamarcusso]

Hi @GimpelZhang , thanks for reporting that, I just pushed the fix to #122. Once the pipeline tests it, I will merge it into master.

[GimpelZhang]

Great! Thanks.