Houdini Tutorial: Simulating a Tire with Vellum, and Camera Follow Transform Extraction, with File
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Vellum is a simulation framework that uses an extended Position Based Dynamics approach. It can be used to create many different things including cloth, hair, softbodies, balloons, and grains. The main advantage of a Position Based Approach is its controllability, stability, and ability to produce believable results quickly.There are several shelf tools that will create the basic node setup for you. The best example of a SOP setup using Vellum is the Simple Cloth tool, which is available on the Characters tab for Houdini Core users, and on the Vellum tab for Houdini FX users.It asks you to select a geometry object to solve as cloth, and a geometry object to use as a collider. In this example, a grid is used as the cloth object and a torus is used as a collider. These get wired into the Vellum Constraints node, which creates constraints to act like different materials. The Simple Cloth tool uses a Vellum Configure Cloth node, which is a Vellum Constraints node with common cloth parameters already applied. There are also presets for Vellum Configure Balloon, Vellum Configure Grain, Vellum Configure Hair, and Vellum Configure Softbody that use this same node.The Vellum Solver allows you to modify things like Substeps and Constraint Iterations to balance the speed and quality of your simulation. The node also has a Forces tab that allows you to set Gravity, Wind, Wind Drag, and Friction.NoteThere is a default Wind Drag force that is set in SOPs. However, the default DOP network does not create a drag force.The Vellum I/O node saves the output geometry as well as the constraint geometry to disk. There are some default deletes on the Save Filter tab to clean out the most common attributes that aren’t needed in order to cut down on the file size.The Vellum Post-Process allows you to visualize components like False Color Mode for stretch or bend stress. You can also visualize constraints and thickness, which is useful for troubleshooting your simulation.Vellum nodesThere are several Vellum SOPs available in the tab menu. Many put down a Vellum Constraints node with a different Constraint Type set and specific parameters exposed for the constraint type.
0:00 INTRO
1:04 scene overview
1:33 tire preperation for Vellum simulation
3:48 extract transform procedure
6:50 Vellum constraint setup
9:16 point deform set up
10:08 camera follow transform extraction
11:25 result