[Radiance-general] Computing irradiances for glow materials

[Christopher Rush]

I think Lars is saying you can calculate irradiance based only on the radiance values of your back-projected image, without any ray-tracing. Important to note that this - and most of this discussion - assumes your back-projected image is captured in a calibrated way such as what Photosphere/hdrgen can do (there's a separate forum for HDR images if you're unsure).

Radiance = Irradiance * Reflectance / Pi




> Just an idea... if you assume all materials to be lambertian, you just need the reflectance of any visible surface to be able to calculate the irradiance it receives...?

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