You can also set or create arbitrary attributes using the Attribute SOP. The surface nodes in the Attributes group of the tab menu set different types of attributes. You can also set your own custom attributes to be used by your node expressions, scripts, exporters, and so on. For example, the dynamics solvers and rendering engines will often use certain attributes on the geometry if they exist. For example, you could set the per-point color based on the vertical position ( PY) of the point.Ĭertain attributes you can set manually and if they're present they will be used by Houdini. Houdini sets some point attributes that you can use in expressions. Point color, position, UV coordinates, spline weight ( W), and normal, for example, are stored as point attributes. Attributes are named values stored on vertices, points, primitives, and objects.
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