I Need a Black Fading Texture

Does anyone know where I can find a or the black fading texture used in RP_C18 to enable buildings with windows to still have areaportals. Thank you.

tools/toolsareaportal tied to an areaportal.

eh?

sigh.
You take an areaportal in the window and put the tools/toolsareaportal texture on it

Will that make it fade to black when you’re far away, and be see-through-able when you’re close up?

Yes.

Thank you.