Request: only draw exposed block faces in cave mode

[bgulanowski]

Cave mode rendering draws entire blocks. Ideally, it would only draw the face of the block which is exposed (adjacent to air or fluid). The extra drawn surfaces make the rendering noisy. It's hard to tell what is actual surface.

Conceptually, cave should work more like a 3D renderer when the point-of-view is in the void. This effect is sometimes seen in Minecraft itself, due to a bug that causes near chunks to not be drawn, allowing a view of caves underground.

Algorithmically, this could possibly be achieved by only drawing surfaces that meet two requirements: they touch air, and they face towards the point-of-view.

[CounterPillow]

This is currently not easily implementable since we create the block models as sprites, and then no longer have any concept of their sides once we draw them.

Maybe once OIL gets done, or whatever.