If you're using the PhysX dynamics engine, you can offset the positions of the slider and spring constraints from the centers of the constrained rigid bodies.
Select a Spring or Slider constraint and press Enter to open its property editor.
In the constraint's property editor, click the Attachment tab and use the Body A/B Local Offset sliders to offset the position of one or both of the constraint's attachment points from the rigid bodies' centers:
Body A offsets the position of constraint's attachment point to the Body A rigid body while remaining anchored to the Body B rigid body. Body A is the first rigid body that you picked when you created the constraint.
Body B offsets the position of constraint's attachment point to the Body B rigid body while remaining anchored to the Body A rigid body. Body B is the second rigid body that you picked when you created the constraint.
Slider constraint created between two rigid bodies. Body A (passive) is the first one picked when the constraint was created, and Body B (active) is the second.
On the top, the slider's attachment point is offset from the center of Body A in the X and Y directions.
On the bottom, the slider's attachment point is offset from the center of Body B in the Z direction.
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