Этот сайт лучше всего просматривать в современном браузере с включённым JavaScript.

Shader Emision and Transparency

RemDust

Hey guys,
Can you confirm that there is no way to have an emission map with transparency images ? :think:

I tried premultiply alpha and standard alpha but I still have hard edges when emission is enabled.
I also can see that the Depth Alpha Cutoff have an effect on the edges created, not really sure what to do with it though ^^

To be clear, sall I override all the slots except the one with transparency or is there a way to manage this case ?
Cheerz !

RemDust

Harald

Admittedly I don't quite understand why you would need emission maps to cover transparency. If you set pixels in the emission map to black, nothing will be emitted at this texel. Could you please describe what you are trying to achieve?

RemDust

I have some "wooshes" and "slashes" sprites which I'd like to have emission properties, but their edges are alpha faded.
-> When used as emission map it gives me an alpha cutout sort of threashold effect.

It's not that a big deal, I wasn't sure I was gonna use it but well, I was just wondering if I was doing something wrong ^^

Harald

RemDust написал
-> When used as emission map it gives me an alpha cutout sort of threashold effect.

Thanks for the clarification, now I understand what you mean.

The problem I see with your use case is that the Depth alpha Cutoff threshold already clips (discards) a transparent area since it tests the main texture's alpha channel value, where you would however like to have an emission map show on top of the 100% transparent pixel.

You now have a few options:

a) You can set the alpha threshold to 0. When using one of the Sprite shaders, this will automatically turn off alpha clip functionality to remove the unnecessary overhead.
b) If you don't want to turn off alpha clipping, you could set the main texture's color value to 1/255 and set the threshold to the same 1/255 value. This is not the cleanest solution however, as it shows the main texture's color although you don't really want it to (even if it's very transparent).
c) Create a copy of the desired shader and modify it accordingly so that it e.g. first tests for non-zero emission and then omits clipping the fragment.

RemDust

Just a quick update to let you know that it was a silly mistake :sucks:
My emission material was using alpha blend modes, changing it to Additive ( and changing the sprites transparency to black, obviously) did the trick.

Sorry for this "noobiness" :upsidedown:

Harald

No problem, glad to hear you've figured it out. Thanks for letting us know! 🙂