question about the clip() function

Unity Engine
1

can anyone explain to me how i could use clip() on pixels with a certain greyscale. f.e. clip pixels that are darker then a certain level of grey? it would be much appreciated.

Mr. Me

2

Try

clip(alphaValue - valueYouWantToClipBelow)
3

Thanks,

but i found a way to do what i want using the Alphatest function. Does anyone know if there is much performence difference between these 2?

4

It depends on the exact scenario (you can test yours), but they should be pretty similar.

5

Isn’t discard going to be ever so unnoticeably faster, unless your limit is 0 (inclusive), due to the lack of subtraction?

6

I expect that he compiler will emit very similar code either way. You could check, though, by opening the compiled shader to look at the assembly.