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The ps3 eye toy has been available for unbelievably low pricing for years now ($7 USD).
For many tasks, high FPS video is very useful, and 30fps webcams simply will not due. Also critical to high frame rate cameras, it has a global shutter. It's too good to be true, because like most things, it is.
Once upon a time this camera worked with processing. Now the only way I can get it to work with processing is on a very specific old version of processing 1.5.1 shown here http://thomasdiewald.com/processing/libraries/diewald_PS3/
I'd really like to get this working on processing 3. I've searched extensively for cameras with similar capability and it doesn't exist outside the world of industry/scientific cameras starting at 100x the price.
It seems most of the hard work is already done inside of CLEyeMulticam.dll , and only the java side of things needs to be updated, in diewald_fluid.jar
The CLEye website which claims to sell an SDK with processing examples hasn't worked for years and attempts to contact them have not been returned.