mover-constraints.md

title	description
Mover Constraints	Mover constraints apply force or torque to move one or more assemblies.

The physics engine includes the following Class.Constraint|Constraints that apply force or torque to move one or more assemblies. In addition, various mechanical constraints are available which behave as conceptual mechanical connections, including hinges, springs, ropes, and more.

[LinearVelocity](../physics/constraints/linear-velocity.md) applies force on an assembly to maintain a constant velocity along a 3D vector, line, or 2D plane [AngularVelocity](../physics/constraints/angular-velocity.md) applies torque on an assembly to maintain a constant angular velocity [AlignPosition](../physics/constraints/align-position.md) applies force to move two attachments together, or to move one attachment to a goal position [AlignOrientation](../physics/constraints/align-orientation.md) applies torque to align two attachments, or to align one attachment with a goal orientation [VectorForce](../physics/constraints/vector-force.md) applies constant linear force on an assembly [Torque](../physics/constraints/torque.md) applies constant torque on an assembly from its center of mass [LineForce](../physics/constraints/line-force.md) applies force along the theoretical line connecting its two attachments

Constraint Visualization

To accurately visualize constraints in Studio, you can use the following options from the Model tab:

**Show Welds** — Show `Class.WeldConstraint|WeldConstraints`, separately from the visualization of other constraints.

**Constraint Details** — Show complete visual details of non-weld constraints.

**Scale** — Relative scale of visualizations.

Creating Constraints

Mover constraints typically connect one or two Class.Attachment|Attachments or Class.Bone|Bones. When connected to Class.Bone|Bones, the constraint will use their animated position and orientation.

To create a mover constraint, you can use either the Create tool or the Explorer window.

1. In the Model tab, access the Create button's picker menu and select the desired constraint type, for example Angular Velocity.

   

2. In the 3D viewport, hover over any Class.Part or Class.MeshPart and click to add a new Class.Attachment to the part at the visualized point. Alternatively, hover over and click an existing Class.Attachment or Class.Bone to use it for the constraint.

3. Some mover constraints utilize or support a secondary attachment in their functionality, so the tool might prompt you to repeat the previous step on another Class.Part, Class.MeshPart, or Class.Attachment, or Class.Bone.

   [AngularVelocity](../physics/constraints/angular-velocity.md) using one attachment [AlignPosition](../physics/constraints/align-position.md) using two attachments

1. In the Explorer hierarchy, hover over the intended parent, click the ⊕ button, and insert the desired constraint from the drop‑down menu, such as a LinearVelocity.

   

2. With the new constraint selected, locate its currently empty Attachment0 property in the Properties window.

   

3. Link the Attachment0 property to an Class.Attachment or Class.Bone in two consecutive steps:

   1. In the Properties window, click in the Attachment0 row to reveal the selection cursor.

   2. In the Explorer hierarchy, click on the target Class.Attachment or Class.Bone.

   

4. Some mover constraints use or support a secondary Class.Attachment or Class.Bone in their functionality. If necessary, repeat the previous step on the Attachment1 property in the Properties window. For instance:

   • By default, AlignPosition and AlignOrientation align their primary attachment (Attachment0) with a secondary attachment (Attachment1).
   • LineForce requires two attachments to apply force along the theoretical line connecting them.

Physical Simulation

To simulate physics while moving or rotating parts, you can switch to Physical mode in the Model tab, effectively forcing parts to obey physical limitations. For example, if you drag one part around the scene and it collides with another part, it will physically push that part out of the way.