d12e8b4e_sic_Dome_projection___Domerama__Spherical_mirror
[0] Projection coverage [Fisheye] Most fisheye projection solutions project on 3/4 of the dome surface. [Spherical mirror] 
For a full dome coverage, using 2 projectors is the simplest solution. Many configurations are possible, and the optimum one will depend on dome size and the projection coverage area.
Geodesic Dome projection » Domerama
Spherical mirror