configs/objects/ball/ball_1.object_config.json

{
  "render_asset": "../../../objects/ball_R0.3.glb",
  "collision_asset": "../../../objects/ball_R0.3.glb",
  "mass": 0.5,
  "COM": [
    0,
    0.0,
    0
  ],
  "join_collision_meshes": false,
  "semantic_id": 2
}