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Test geometry provides some built in geometry to prototype and experiment with. Not only does it provide a more interesting starting point than a torus, but it is also more representative of the sort of geometry your effect will have to deal with: multiple components, holes, and not perfect geometry.
Meet Flip!, the official Flip Fluid Floatation device for all testing needs!
This inflatable poolside companion can be towed behind your boat, or if you are sufficiently dexterous, used as a diving platform!
Position of the center.
The following examples include this node.
The first example shows a LookAt constraint with a global Y axis up vector. The second example shows a LookAt constraint with its up vector driven by an object. The third example shows a LookAt constraint applied with Keep Position turned on. The CHOP Offset node, after the constraint, makes the object keep its orientation when the constraint is applied. You can use the LookAt Shelf Tool to recreate the examples.
This example demonstrates interacting grain simulations of very different sizes.