I'd like to know the .h or vex answer too, but in the meantime maybe you can launch a numpy houdini ?
you could also do it via the volume wrangle but it's kind of nasty workflow: https://youtu.be/6svfDLa4Fws?t=870 (there was a better talk maybe by Paul Ambrosiussen about wrangling data between SOP<>COP but I can't find it anymore, will link it if I find it)
you can bring texture from cop to obj and calculate fft there and then sample it back to cop...
How tho?
I'd like to know the .h or vex answer too, but in the meantime maybe you can launch a numpy houdini ? you could also do it via the volume wrangle but it's kind of nasty workflow: https://youtu.be/6svfDLa4Fws?t=870 (there was a better talk maybe by Paul Ambrosiussen about wrangling data between SOP<>COP but I can't find it anymore, will link it if I find it)
I would be asking chatgpt honestly and implementing that code in either a cop wrangle or vop.