In Houdini, the Geometry Spreadsheet shows you the underlying data for your geometry. It has four tabs: points, vertices, primitives, and details. It's a powerful feature to let you see how Houdini Nodes change the geometry spreadsheet as you work your way through a network. It's helpful for debugging, and for developing new nodes yourself!
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If you want to make Hollywood quality visual effects (VFX), then you will want to learn Houdini. Houdini is a procedural system from Side FX Software that empowers you to create everything from realistic terrains, water effects, pyro simulations, and realistic assets for both film production and game development.