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What is the best way to trigger the fall action after the box has been picked up and keep the action occurring over a certain height?
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You could set up a callback function for the grabber's release event. In the callback function, apply the
falling action to the object.
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Also how do I make it stop falling whenever it collides with another object?
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This seems like it could get complicated. You could try using
collision detection to detect if the collision has occured. Then use the
node.endAction command to end the falling action and have the object stop immediately.