H1rono/assimp fetch

[H1rono]

close #220 Tested with cargo run -- https://github.com/openrr/urdf-viz/raw/main/sample.urdf on macOS.

[taiki-e]

Tested with cargo run -- https://github.com/openrr/urdf-viz/raw/main/sample.urdf on macOS.

That file does not contain a mesh, so I don't think this case can be tested.

[taiki-e]

I think the URDF used in the gallery in readme is suitable for testing.

e.g., UBR1

urdf-viz https://raw.githubusercontent.com/unboundedrobotics/ubr1_preview/6ce886f4d8d02999c442e17f6ee2685fea97b70e/ubr1_description/robots/ubr1_robot.urdf --package-path ubr1_description=https://raw.githubusercontent.com/unboundedrobotics/ubr1_preview/6ce886f4d8d02999c442e17f6ee2685fea97b70e/ubr1_description

• Sawyer (Rethink Robotics) https://github.com/RethinkRobotics/sawyer_robot/tree/d1ef3d0ca83d0a943839783efd9b162e6930f2b7/sawyer_description/meshes
• nextage (Kawada) https://github.com/tork-a/rtmros_nextage/tree/ac270fb969fa54abeb6863f9b388a9e20c1f14e0/nextage_description/urdf/meshes
• HSR (Toyota) https://github.com/ToyotaResearchInstitute/hsr_meshes/tree/2d831996c0f9548164a4df5886104793e557897a/meshes
• UBR1 (unbound Robotics) https://github.com/unboundedrobotics/ubr1_preview/tree/6ce886f4d8d02999c442e17f6ee2685fea97b70e/ubr1_description/meshes
• Pepper (Softbank) https://github.com/ros-naoqi/pepper_robot/tree/efad3979b3745d17d5f73d4f97b1fe2b00a8f164/pepper_description (?)
• PR2 (Willow Garage) https://github.com/PR2/pr2_common/tree/b34703bcca2b07cadbc3777d3c504c232a0c0c28/pr2_description/meshes
• thormang3 (Robotis) https://github.com/ROBOTIS-GIT/ROBOTIS-THORMANG-Common/tree/c1159a16dfdca00db1c9b00fed78c2e116e338a9/thormang3_description/meshes

[H1rono]

The command you gave me worked with no errors.