Comparision of common weighted OIT methods

Weighted OIT algorithm doesn't sorting fragments.

Reference: http://jcgt.org/published/0002/02/09/paper-lowres.pdf https://cg.ivd.kit.edu/english/mboit.php

x and y axis are mean and variance of blending fragment colors. z is the percentage error relative to the ground truth.

McGuire's weighted blend OIT with z bias looks the best with limited computation resource. Or one can use MOIT if ALU is strong enough.