TWO_PASSES_TWO_SIDES
Two passes: back faces first, then front faces; approximates two-layer transparency.
Two passes: back faces first, then front faces; approximates two-layer transparency.
Two passes: back faces first, then front faces; approximates two-layer transparency.
Two passes: back faces first, then front faces; approximates two-layer transparency.
Two passes: back faces first, then front faces; approximates two-layer transparency.