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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.

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

• IFDFormatDocument Mantra 8
• IFD Version 9 Mantra 9

for insight on how use bend IFD's to your will.