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From Odwiki

IFD is the file format that is expected by Houdini's renderer, mantra. IFD stands for "Instantaneous Frame Description". The ifd file contains a series of commands for mantra to read which define the objects and shaders to render.

The IFD language is a sub-set of the hscript scripting language. Some commands are common between the two.

To see a list of commands in Mantra, you can:

 %> echo "help" | mantra

IFDs are generated by the MantraROP by way of the SOHO python interface.

Its useful to be able to manipulate this ASCII data if you are doing something unexpected (which is fun). Please take a look at this for insight on how use bend IFD's to your will.

• IFDFormatDocument Mantra 8
• IFD Version 9 Mantra 9