cast shadows
Yeah I’ll add a new menu for mesh material stuff, where you can specify things like flat shading, backface display, cast/receive shadows, etc…
The mesh opacity options will be in this menu (right now it’s at the bottom of the shading menu which is a bit weird).
emissive
See the part on painted channel Paint light / Bloom - #14 by stephomi
So, it will probably come but later (it won’t light the scene though, but glowing surface will be easier to achieve along with bloom)