you gotta use raytraced translucency.
that currently got some issues with volumetric fog in close range. refraction is not supported, yet (!?!). normal map is ofc supported, but removed for clarity. the plant is in nanite mode and fully supported aswell. area shadows are supported, but are ofc noisy. alpha masked shadows are supported for raytraced sun lamps. mega doesn’t have that alpha duplication yet. afaik it’s being worked on. the refraction bounces are the controller how many panes you can stack.
i tilted the panes, so… you should see 3 distinctive raytraced head and room reflections. and full passthru to the green block.
it is pretty feature complete of what you should expect a stackable dirty glass pane to look like. best looking glass without lumen noise in the reflection. : )
btw… @Arkiras it does reflect lightmaps in 5.5.3. which version you on?
this is plain baked gi. lights off, obvi…