Pbr materials have a VERY powerful opacity system which allows you to do things like stained glass and other complex effects.
BUT… this comes at a price where the age old method of using an opacity map to make “holes” in stuff got very complicated. (base color has to be WHITE where it’s transparent, then opacity has to be BLACK where it’s to be mapped out, HOWEVER… that only makes for “clear glass” not a true hole.But if you color the White bits, then you can get colored transparency, which is amazing…) This was making me straight up mental as I was trying to make a vent panel.
Andy and his crew just made a small but lovely addition to the pbr material settings which fixes this and gives us all the ability to make “holes” in materials. Simply add a black and white image in the new Alpha slot, and >poof< holes!
small bug is being addressed where the alpha percentage is not respected in ray traced mode. Will be fixed asap.
Give it a go!