Is there a way?
Wolfwings says there probably is but can’t remember the shader function, so I’m curious.
Basically am in the process of reworking my caves to remove all hard edges that I can, and this would be a great help 
Efforts so far are going well, but this would be the icing on the cake:
My first thought would be “q3map_lightmapMergable”, or may be try using “q3map_baseShader” like if you were working on a terrain entity.
after thought if you make the whole lot a function group, the lightmap should be projected across all grouped surfaces.
lightmapmergable might be the one.
I’ll do a bit more searching on those terms and see what I come up with.
RE: the grouping - I’ve not heard anything about func_groups automatically grouping the lighting across 'em?
Anyway this isn’t really possible since I’ve got to split most things up to use alpha volume brush thingies.
I’v also been playing with the “alpha volume brush thingies” on complex terrain (cliffs and gully’s), its required some inventive use of diffrent blends and decal layers, so I can keep the whole terrain a one group, but the light mapping looks good so far.
you would ask that, a number of very silly errors on Saturday resulted in me deleting most of me terrain and cliffs, I only twigged a few hours latter after a few saves (no backup Doh!)
Im in the middel of rebuilding it atm, its along the same lines as the terrain in bergen, just a lot more refind.
editor shot
early test map
Heh I like the editor pics - I was commenting to Ratty earlier today how now I’m getting into this stuff more radiant looks a mess with textures with text all over 'em
hee hee, at least its no longer just the boring 'terrain' word we had on 1000s of brushes with the old alpha map and meta shader terrain system 
