Romain Guy ddef5ec3c4 Change how emissive works (#2415) ...

Emissive was previously defined in exposure compensation stops, which
was confusing to many. It is now a value in nits, with the alpha
channel controlling how much the camera exposure affects the emissive.
At 0, the emissive value is just added to the final pixel color, at
1 the emissive value is multiplied by the exposure just like with
regular lights.

The intensity of the emissive property can be computed from an
exposure value (EV) easily with the following formula:

emissive.rgb = emissive.rgb * pow(2.0, EV - 3.0);

This formula is available as Exposure::luminance(float) already
in Filament.

2020-04-17 17:42:21 -07:00

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