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From Odwiki

The Mantra ROP found in Outputs is used to invoke mantra to render, which it does via ifd files. Most of the time during interactive use of Houdini, the ifd generation is piped directly (and invisibly) to mantra.

The Mantra ROP will allow you to configure your render settings for mantra; quality, output files, sequence length, DeepRasters, etc.

To create gzip'ed ifd files:

• Make sure 'generate-script-file' is off
• Substitute the render-command 'render' with 'gzip > foo.ifd.gz' (replace 'foo' with a real filename)

To render gzip'ed ifd files:

  % gzip -dc foo.ifd.gz | mantra [options]