Geometry

If a mutable has attribute type of geometry, it’s a geometry. A geometry is a substance in space.

Available attributes of geometry:

Name	Type	Description
subtype	string	refer to Basic shapes, Deformed shape, and Mesh loaded from USD
physics	string	collision or rigidbody

If physics is set to rigidbody, the object is a dynamic object that responds to physics. If it’s set to collision, the object is a static object that dynamic objects interact with. For example, a wall can have collision and a ping-pong ball bouncing off of it has rigidbody.

Basic shapes

If subtype is one of cone, cube, cylinder, disk, torus, plane, or sphere it defines the corresponding basic geometry.

Deformed shape

Physics simulation for bottles is not supported.

If subtype is bottle, it defines a bottle shape, which is a parameterized deformed geometry controlled by the following parameters:

Name	Type	Description
base_effector	string	vertical position of the base effector
neck_effector	string	vertical position of the neck effector
horizontal_effector	string	horizontal position of the body effector
vertical_effector	string	vertical position of the body effector

This image illustrates how the shape of the bottle is controlled by these four effectors.

Note

We currently don’t yet have collision detection for deformed shapes; they don’t have physics.

Mesh loaded from USD

If subtype is mesh, it defines a mesh loaded from USD.

Additional attribute of mesh:

Name	Type	Description
usd_path	string	The path to the USD in disk