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Question by Goepfie · Mar 27, 2015 at 05:08 PM · guishaderspriterenderer

Sprite shader ignoring overlaying semitransparent gui image/sprite

Hey Everyone,

I am breaking my head over the following problem and now I got stuck completely. I would appreciate some help pointing me in to the right direction.

My scene is purely composed of sprites and GUI elements. There is a semi-transparent GUI-Image on top of the highest camera as a scene fade. Now I want to highlight specific sprites by having them ignore color/alpha of said fade image. I can not move the sprites out of their current sorting/target camera, because they might be obstructed by other sprites and GUI images that are affected by the fade image.

I tried tinting every Sprite in the scene, but don't like the performance implications as well as having to tint generated sprites while the fade is active. I also tried to switch the layer of everything necessary, but thought it as to be ineffective for dynamic use in project. I also tried a combination of both.

Now I came to the conclusion, that I might need a special shader for this, but I am inexperienced in shader programming and don't know what exactly I am trying to achieve.

Is this something that could be done simply? Do I have to improve my scene setup at some point? I want to keep this as slender as possible to have a more procedural approach afterwards to highlight different situations per scripting. I also won't have the luxury of having additional spritemask graphics, since every object on the scene might be subject to highlighting.

Thank you very much in advance!

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