Volumetric Material / Light inside a boolean

[JP11]

Hi there,

I'm revealing mesh text in cinema4d by booling it in a cube and then animating the cube out, revealing the text. Id like the area where the cube intersects / reveals the text to emit volumetric light as the cube animates out. So far this works half-way with either a light material or a volume material on the cube, but all the intersection does is emit light, I can't get it to emit volumetric light or godrays.. Any ideas on the volume material settings - or should I be doing this completely differently?

cheers, Jan