I'd like to create a look for an in-game computer interface, that floats like an object in the level (like in the image below). How would you create an alpha channel like those stripes? Shader? Post Effect? Something else? What do you think is the most easy way?
Ok, just in case someone is interested: This is the final shader code I wrote for this effect. It uses a texture for the alpha channel, that is textured in screen coordinates, so you can decide for yourself how the alpha should look like. The Lighting function produces a flat, unlit surface.
Most likely not as performant as taoa's answer, but more flexible and better suited for what I needed.
Only drawback so far: In oder not to stretch the alpha, but tile it across the screen, you have to pass the shader the dimensions of your (quadratic) alpha texture and the screen.
#pragma surface surf Unlit alpha
does not work for iPhone ?
It says:Shader error in ‘Mobile/Alpha Vertex Color’: Surface lighting model ‘Unlit’ not found. Available models: BlinnPhong, Lambert at line X