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* Enable with 'r.DistanceFieldGI 1' on console * Surfel GI is currently disabled as it doesn't interop yet * A GBuffer atlas is created for Landscape from components that can affect indirect lighting based on the current view * Shadowing from a directional light is computed by reusing shadowmaps and ray tracing distance fields * Lighting is computed for the atlas using GBuffer properties * First bounce GI light transfer is computed for a receiver by iterating over all the nearby lit texels of the heightfield and treating them as Virtual Point Lights. Two gather regions are used, the larger one skips through the heightfield to achieve a larger bounce distance. Distance field AO is used to provide local shadowing. * Material diffuse color not yet supported, and regions outside of the view don't have valid shadowing. [CL 2436606 by Daniel Wright in Main branch]