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A   pivot is a node that serves as a pivot point for its child nodes and enables to easily control transformation (mainly rotation) of this group of nodes. It has virtually zero influence on performance and shares all common options that other nodes have.

The pivot node should be used when you need to set a specific pivot point for a node or a group of nodes. For example, a pivot node can be used to add a pivot point for:

  • Landing gears of an aircraft so that they are geared down and up relative to this point.
  • Propeller blades of a helicopter so that they are rotated relative to this point.

Propeller Blades are Rotated Relative to a Pivot Point

The pivot node has the pivot and local transformation matrices. The pivot transformation matrix sets transformation of the basis of rotation (the pivot point) of child nodes. The local transformation matrix sets local transformation of child nodes relative to the pivot point. Both matrices can be edited in the Node Pivot tab of the Parameters window of UnigineEditor.

See also#

  • A NodePivot class to edit pivots via UnigineScript

Adding a Pivot Node#

To add a new pivot node via UnigineEditor do the following:

  1. Run UnigineEditor.
  2. On the Menu bar, click Create -> Node -> Pivot.

  3. Place the pivot node somewhere on the scene.

    By default, the pivot and local transformation matrices of the added node are equal to identity matrices. You can change them in the Node Pivot tab of the Parameters window.

  4. Add child nodes to the pivot node: select the required nodes and drag the nodes inside the pivot node:

Editing a Pivot Node#

Editing the pivot node implies changing its pivot and local transformation matrices in the Node Pivot tab of the Parameters window.

Pivot Node Settings

You should distinguish between the concepts of the pivot node and the pivot point: changing transformation of the pivot point doesn't affect the pivot node and vice versa. By default, their transformations coincide.

Transformation of the pivot node is edited in the Node tab of the Parameters window. To edit the pivot point transformation, you should select the pivot node and switch to the Node Pivot tab. As a result, 2 manipulators will appear: the smaller manipulator for the pivot point and the bigger one for the pivot node. To change the pivot point transformation press Edit Pivot and change the required values on the Node Pivot tab or transform the manipulator.

Changing Position of the Pivot Point Manipulator
Pivot Node and Pivot Point with Different Transformations

Changing the local transformation of the child nodes doesn't require pressing Edit Pivot: you can simply change the required values on the Node Pivot tab. You can also move, rotate or scale the pivot point manipulator by using the required transformation mode. For example:

Child Nodes Rotating Relative to Pivot Point

If the Edit pivot button is pressed, changing the pivot point manipulator will change the pivot point transformation. Otherwise, the local transformation of the child nodes will be changed.
Last update: 2018-12-27