The size in percent of the screen width. Is clamped by some number. If you need a larger number, use the next lower resolution blur instead (higher number).

Modifies the brightness and color of each bloom. Using a black color will not make this pass faster but that can be done.

Bloom effect radius.

Smooth factor.

Scales the color of the whole bloom effect.

Defines how many luminance units a color needs to have to affect bloom. In addition to the threshold, there is a linear part (one unit wide) where the color only partly affects the bloom.

To have all scene colors contributing to the bloom, a volume of -1 needs to be used.