adding raleigh back into terrain inscatter
patch wip
made a start on a LoD tile renderer
made ambientBias increase ambient sky light, not sunlight
making things bumpier
more lod wip
cleaning up some dead code
initial multi-scatter code
integrating air density into sky scattering model
playing around with chromatic abberration
adjusting hi-res patch size
cleaned up comments
added skirts to patches