That should work for at least getting a color though it may get confused by shader passes being mixed in. Try replacing blendColors with a layeredShader, and attach your mask to the top layers transparency (these nodes work left to right, left is top).
Hello everyone! I hope this is the right section in the forum for my question. If it's not, please let me know. I am still very new to this, so please consider you are explaining to a noob. ^^ So... my problem is the following: I am trying to create an eye following a tutorial and everything was fine until I started…