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From Odwiki

What it does

Unix SOP allows you to pipe Houdini's geometric data out to your custom program written in C/C++, Java, Perl, Python, or any modern language exist. Your custom program should be written to allow standard stream input in order to receive data stream from Houdini if you intend to modify data on the fly. Conversely, your program must output data stream via standard output. Data that output from your program must maintain the same integrity of the GEO file format.

Please also note that Unix SOP can be slow because Houdini has to open a pipe to send data back and forth. For best performance, optimize your code or use HDK. Unix SOP can be a quick way to send GEO to your custom program for parsing, or as a way to generate your on (GEO compliant) geometry to pass into Houdini.

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