Request: Filter contours by layer

[KenneyNL]

Request: Add an option for the shader to ignore layers.

[keijiro]

It's doable but quite slow. I think it might be unacceptable level for a real-time application.

So, please don't expect this. I'm not strongly motivated. Even if I make it, it might disappoint you.

[KenneyNL]

Understood! It might be better to not include the option indeed, people might use it without knowing it's a huge performance waster.