In combination with alpha channel textures or transparency, blends the entity
or particle over the background instead of mixing both. This
way the colors add and the entity appears illuminated, like fire or sparks.
In combination with UNLIT the
entity receives an average environment light as by normal sunlight in the
on - additive blending.
off - mixed blending (default)
set(my,BRIGHT); // lite-C
my.BRIGHT = ON; // C-Script
alpha, TRANSPARENT, UNLIT