zwyczajnie enviroment nie emituje photonów
cytat:
Notes
The photon map cannot simulate secondary illumination due to skylight. The photon map is mostly useful for interior scenes with artificial lighting or relatively small windows.
The photon map works only with V-Ray materials. Standard materials will receive GI, but will not generate any photons.
Polecam:
http://www.spot3d.com/vray/help/150R1/render_params_photonmap.htm