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Le 19-06-11 à 21:32, Mike Horvath a écrit :
> What is the correct method of calculating and specifying Lumens in
> LightSysIV?
>
> Light_Color(light_temp, light_lumens)
>
> Do I need to know the distance and diameter of the Sun beforehand? What
> about fade_power and fade_distance?
>
> Thanks.
>
>
> Michael
For the Sun, don't bother with light fading : Use a light with the
parallel option and you are good. Unless your scene scale is
interplanetary, the fading over the extent of your scene is totally
negligible.
For the extent of the Sun when using an area_light, make it's diameter
about 0.01 of the distance. Not exact, but close enough.
For more normal lights, the fade_power must be 2. No other value is
realistic.
For fade_distance : Make it small. For an area_light, it should be about
the width of the light. For point light, a value of about 0.1 is correct.
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