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The P5JS reference claims that alpha is property for the various WebGL materials. However, as far as I can tell, the only effect decreased alpha has it to increase the brightness. That is, the material simply gets more white as the alpha is decreased. This was raised as an issue here: https://github.com/processing/p5.js/issues/1117 and marked as fixed, but I'm still not getting transparency.
I have tested this with basicMaterial and specularMaterial in Chrome, Firefox, and Safari.
Can anyone point me in the right direction or confirm that this is still an issue?