@Eta14 not all P3D sketches will work on RaspberryPI4 but many will. The original support for processing was for the RaspberryPI3 Getting Started - Processing for Pi and most of the technical information in the link @micaut supplied is totally irrelevant to RaspberryPI4 but that’s the latest official support. I’ve successfully installed an alpha version of processing4 on ManjaroArm see here Processing in style with Java 11 - #40 by monkstone. NB: The official alpha3 version does not work!!! In principle there’s no reason why it won’t also work on RaspberryPI OS, because my PiCrate (ruby-processing for RaspberryPI) works on both operating systems.
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