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Bridge Constraint

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Intro​

Connect Shapes together to form chains or bridge structures in a Forge Dynamics simulation.

UI​

Stretch - Determine how much the Constraint stretches. A higher value will result in more elastic looking result.

Frequency (Hz) - A higher value will give the spring more bounce.

Damping Ratio - A higher value will bring the spring to a rest more quickly.

Breakable - When enabled, the Constraint can be broken by other forces.

Breaking Mode - Set a condition for the Constraint to break under:

  • Force - The Constraint will break when a force is above the Breaking Force.
  • Distance - The Constraint will break when it moves beyond its Stretch Limit.
  • Time - The Constraint will break when a force above the Breaking Force is sustained for a number of consecutive frames above the Breaking Duration.

Breaking Force - Set the amount of force required to break the Constraint.

Stretch Limit - Set a multiple of the Rest Length a Constraint is moved by before it breaks. For example, if the Rest Length is 100 and the Stretch Limit is 2, the Constraint will break when stretched to 100×2=200100 \times 2 = 200.

Breaking Duration - Set the number of consecutive frames a Constraint must be under a force above the Breaking Force before breaking.

Stress Threshold - Set a threshold as a percentage of the Breaking Force within which a Constraint will break.

Button iconAdd - Add pins to the Constraint.

Pins​

  • Mode:
    • Off - Disable the Constraint.
    • Pin - Pin the position of the specified index.
    • Transform - Pin the position of the specified index to a transform.
  • Pinned Index - Set the index to be pinned. The strings first or last can be used to dynamically set the first and last Id when using a Sub-Mesh (e.g. Duplicator) as a Body. Alternatively, entering values here will pin the corresponding Id.
  • Transform - Connect a Shape to set the Pin's position and rotation values.
  • Limit Rotation - Limit the Constraint's rotation.
  • Rotational Limits - Set an upper (U) and lower (L) angle to clamp the Constraint's rotation.