This is HOT4D based on Houdini Ocean Toolkit. (see below) Thanks to Drew Whitehouse.

Original readMe.txt :

This is the source code for the Houdini Ocean Toolkit.

For licensing details see the file LICENSE.txt.

The toolkit leverages the following open source toolkits which are covered by their own individual license terms.

1. FFTW, http://www.fftw.org/ (GPL licensing)
2. OpenEXR, http://www.openexr.com/ (modified BSD license, http://www.ilm.com/opensource)
3. Blitz++, http://www.oonumerics.org/blitz/ (GPL/Blitz++ Artistic License, http://www.oonumerics.org/blitz/legal/).
4. Loki, http://sourceforge.net/projects/loki-lib/ (MIT License)

For documentation etc start by looking at -

   http://www.odforce.net/wiki/index.php/HoudiniOceanToolkit

The source is maintained at

   http://code.google.com/p/houdini-ocean-toolkit/

Drew Whitehouse ANU Supercomputer Facility June 2005,2009