How to use build in Unity mask with the shader (Rect Mask etc).

[dirindon]

I was playing around with the shader in Unity, and I am wondering how could I apply mask to it (I do understand that shader would probably need to be edited for that to work but I couldn't find out how to do it).

My test scenario (2d Scene) :
I have UI object 1080x1080, and inside another object thath ave camera feed casted on the rawImage on it (1080x1920), I wish for that object to be masked, and only have 1080x1080 visible on the screen while still having the green screen efect working. Would it be possible to get your help with it?

[otdavies]

Hello, You could create a new texture input to the shader and multiply it with the alpha channel in the final part of the fragment function to achieve this effect. You'd then just need to create an image that is white where you want the green screen and black where you want transparent. I may be able to look at this at some point, but I'll likely work on URP support first etc. Thanks!

…

On Tue, Aug 17, 2021, 4:45 AM dirindon ***@***.***> wrote: I was playing around with the shader in Unity, and I am wondering how could I apply mask to it (I do understand that shader would probably need to be edited for that to work but I couldn't find out how to do it). My test scenario (2d Scene) : I have UI object 1080x1080, and inside another object thath ave camera feed casted on the rawImage on it (1080x1920), I wish for that object to be masked, and only have 1080x1080 visible on the screen while still having the green screen efect working. Would it be possible to get your help with it? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#5>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAX73UUFQWN3VAZQRJR37STT5JDVRANCNFSM5CJV2JPQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&utm_campaign=notification-email> .

[dirindon]

I managed to work around this with one of the ugliest code you might have seen, but it satisify my needs (this is just a fragment of the code) :

if (_UseClipRect && UnityGet2DClipping(IN.worldPosition.xy, _ClipRect) == 0) { half4 color = (tex2D(_MainTex, IN.uv) + _TextureSampleAdd); color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect); #ifdef UNITY_UI_ALPHACLIP clip (color.a - 0.001); #endif return color; } - I can't seem to be able to paste code here, to make it look at least quite decent this was best I could achieve in my short break time.

Basically I added if statement to detect if this pixel should be visible and make it invisible, if it should be visible I let your code do all other calculations, that was done inside " float4 frag(v2f IN) : SV_Target" as well as couple of other minor things to make this work.

[otdavies]

Glad that this approach worked for you!