Look At Constraint

The VRCLookAtConstraint component is a simplified Aim Constraint. It rotates the target transform so its positive Z axis faces towards the sources.

• Is Active - Controls whether the constraint will be evaluated or not. Disabling the entire component and deactivating the game object with the component on it will also stop the constraint from running.
• Weight - Controls the overall weight applied to this constraint.
  • This should normally be in the range 0 to 1, but you can tick the Free edit box if you want to set values outside of that range.

• Use Up Object - Controls whether or not to use a separate transform to determine roll.
• Roll - Controls the angle (in degrees) around the target transform's Z axis that should be used to determine its upwards direction. Only available when Use Up Object is disabled.
• World Up Object - When set, the constraint will roll to try and point its positive Y axis towards this transform. Only available when Use Up Object is enabled.

The two buttons at the top the inspector are utilities to let you:

• Activate the constraint. This saves the current offset from the sources, then activates and locks the constraint.
• Zero out the constraint. This resets the offset to its default value, then activates and locks the constraint.

Constraint Settings

• Rotation At Rest - Defines the transform's rotation when the constraint's overall weight is 0.
• Rotation Offset - Defines the offset applied to the result of this constraint.
• Lock - When enabled, locks the At Rest and Offset values in place, preventing them from being edited.
  • If you activate the constraint and leave these values unlocked, they'll be recalculated as the target transform's rotation changes.
  • If you lock these values and activate the constraint, the constraint will start taking control of the transform.

Sources

The "Sources" list determines which transforms affect this constraint. Click the + button in the bottom right to add a new source. Click the - button to remove the currently selected source. Each source has the following options:

• Source Transform - The transform to use as a source.
• Weight - Controls how much this source should affect the constraint.
  • This should normally be in the range 0 to 1, but you can tick the Free edit box if you want to set values outside of that range.

Advanced

• Target Transform - Defines the transform affected by this constraint component. If left empty, the transform this constraint is attached to will be affected instead.
• Solve In Local Space - If ticked, this constraint will be solved as if the sources are in local space rather than world space.
• Freeze To World - If ticked, this constraint will ignore its sources and keep a fixed rotation instead.
• Rebake Offsets When Unfrozen - If ticked, this constraint will rebake its offsets relative to its sources when Freeze To World is disabled.

See the parent section covering Advanced Constraint Settings for a more in-depth description of how these advanced settings work.