Shader optimizations (skipping AND operands etc.)

[rosenand]

@MostHost_LA

“Hey unreal, check if A is >=< to B but don’t solve B”
Is basically what you are asking.

Not exactly…

@MostHost_LA

in your previous branch, the calculation if branching was a thing would cost less based on the result of the distance check.

Yes, now that was the point. The optimization not being “but don’t solve B” but rather “but be smart about solving B”. I mean I just followed midgunner’s advice… You’re saying it won’t work, right? Both parts of the first IF (both Condition A and B) will be calculated?

And are you sure you need an IF at the end and not a lerp?
sudden color change vs gradual.

In this case yes, on/off. Think about AoE visualization effects, cones of view etc. But this post was more about trying to understand the general rules, not solving one particular case.