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This setup shows you how to destroy a fractured wall with a wrecking ball. A sphere falls down and crashes into the wall, and destroys it. A MultiJoint constraints the sphere to the mounting and acts like a rope.

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The scene setup with the wrecking ball, a prefractured wall, and MultiJoints.

Here is the nodes list:

• 2 “Sphere” objects (wrecking ball, steering geometry)
• 3 “Cube” objects (wall, mounting, ground)
• 1 “Null” object (locator)
• 1 “Gravity” daemon
• 2 “MultiJoint” nodes

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Now, add a MultiJoint and open its “Creation” panel under “Node Params”:

• Objects A > Cube02Sphere01

• Objects B > Sphere01Cube022

• Creation mode > At Locators Positions

• Locators > Null01

• Create/Recreate

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• Select the wall node (“Cube02”).

• Open the “Voronoi by Steering Geometry” tool from the “Tool Bar”.

• Enter the values as shown below and click on “OK”.

• Delete the “Sphere02” and “Cube02” objects – they are not needed any longer.

• Change the new object's “Dynamics” mode to “Active rigid body”.

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Reconnect the Wall's Fragments

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• Add another MultiJoint node (“MultiJoint02”).

• Open the MultiJoint's “Creation” panel under “Node Params”.

• Objects A > Cube03, Cube01_fractured01, Cube03

• Objects B > > Cube03, Cube01_fractured01, Cube03

• Create/Recreate

• Forces > Force max mode > Constant limit

• @ Max force > 150000

• Collisions > Enable if break > Yes

• Break > Break if distance exceeded > Yes

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Simulate

Click on “Simulate” to see the results. Play with different “@ Max force” settings of the “MultiJoint02” node to get different degrees of destruction.

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