(2025-09-14, 13:54)Magnus Forsberg Wrote: How come the transparent colours aren't visible from the backside?
I'm reworking this sticker. It should have a transparent multi coloured print.
But, no matter how I try, using BFC Noclip, the colours are lost when I flip it over and look at it from the reverse side.
It looks like a Z sorting problem, although I could be wrong. If you remove the back face, does the invisible geometry reappear? If so, then that is more likely than BFC.
Background: A standard way to draw transparent parts (used by LDView; not sure about LDCad) is to first sort them in order by "depth into the screen"*, then draw them from back to front. However, the sorting is a lot harder than it seem like it should be, and if they get drawn in the wrong order, then the front ones may prevent the back ones from being visible. I think that in LDView, you end up with artifacts, but the geometry is still visible. It could be that in LDCad the geometry just disappears.
* This is an over-simplification, but hopefully it gets the point across.