environment probes

[kikonen]

Environment map is calculated currently only once, and calculation of cube map reflections is totally separate thing.

To have more accurate reflections in PBR metal and such, should have probe points for environment map, which would be updated based into actual environment, and not just sample from skybox environment map.

Should reflect current env, but is clearly reflecting just env map calculated from skybox

Need to update, per probe

• environment map
• irradiance map
• prefilter map
• brdf LUT

Also,

• logic to decide what probed map to use per each world pos
  • open areas basically easy, but if any walls or such obscure vision, then need to have either more probes, or smarter logic to decide which one to use