.usd

The open source scene graph format created by Pixar. Houdini is deeply integrated with USD as a scene creation and rendering tool, and USD is the Karma renderer’s native scene description format. See Houdini Solaris for more information.

.ifd

Mantra’s Instantaneous Frame Description format. Contains all information necessary to render a 3D scene in mantra, including lights, shaders and geometry.

See the Mantra ROP for information on generating IFD.

See IFD for information about the format.

.rib

Pixar’s RenderMan byte stream format. contains all information necessary to render a 3D scene in RenderMan, including lights, shaders and geometry. See the RenderMan ROP for information on generating RIB.