Parts and Geometries

A part on its own does not have volume so it cannot collide with other elements in a scene.

For this reason, a collision geometry must be added to allow collision (see Geometry Shapes).

Geometry can be used in any of these contexts:

Buoyancy and drag are used to allow interaction of the part with fluid, for example when building subsea mechanisms such as a remotely operated vehicle (ROV). Note that the different types of geometries have a different color in the 3D View.

After you add a geometry, you should modify properties such as position, orientation, and its dimensions (see Modifying the Position and Orientation of the Geometry) as well as the center of mass (COM) and the inertia tensor (see Editing the Mass Properties).

In the assembly, the part corresponds to a rigid body and has three control types: animated, dynamic and static. Control types dictate how the part interacts with other parts. When a part is in an assembly, the control type can be changed in the part's Properties panel .

This table shows which control type has velocity or is affected by force. During simulation, a part reacts to forces when the Control setting is Dynamic. Forces can be applied to a part by the constraints, contacts, and gravity.

Control Type Has Velocity Affected by Force Example
Animated Yes No Windmill blades, conveyor belt, drawbridge
Dynamic Yes Yes Door on hinge, bouncing ball, articulated arm
Static No No Terrain, horizontal or vertical planes


The following topics are covered in this section: