(redblobgames updated this block to use premultiplied alpha - http://apoorvaj.io/alpha-compositing-opengl-blending-and-premultiplied-alpha.html)

I can't figure out why points with gl_FragColor = vec4(255, 255, 255, .1); get darker and then lighter when overlaid with increasing density. (note: it should be vec4(1.0, 1.0, 1.0, 0.1) not 0-255 --redblobgames)

I'm using these blending settings:

blend: {
  enable: true,
 func: {