Happy holidays to all
another question...
When using gensky, how do I get a realistic level to create a ground glow?
Looking at skybright.cal, I notice A3 might be the value I'm looking for
skybright.cal
{ RCSid: $Id$ }
{
Sky brightness function for sunny and cloudy skies.
Additional arguments required for calculation of skybright:
A1 - 1 for CIE clear, 2 for CIE overcast,
3 for uniform, 4 for CIE intermediate
A2 - zenith brightness
A3 - ground plane brightness
A4 - normalization factor based on sun
direction
A5,A6,A7 - sun direction
}
In the following example, would I use 20.1 (the suggested ambient value) or
2.94e+01 (the 3rd attribute)
Or niether? Am I way off? I'm sure it depends on whether your on a black
sand beach or a ski slope, but is there a general value?
Thanks
Rob F
# gensky 6 21 12:00PST +s -a 44.47 -o 123.26
# Local solar time: 11.76
# Solar altitude and azimuth: 68.8 -9.2
# Ground ambient level: 20.1
void light solar
0
0
3 7.13e+06 7.13e+06 7.13e+06
solar source sun
0
0
4 0.057775 -0.357455 0.932142 0.5
void brightfunc skyfunc
2 skybr skybright.cal
0
7 1 2.69e+01 2.94e+01 1.26e+00 0.057775 -0.357455 0.932142
skyfunc glow skyglow
0
0
4 .5 .5 .7 0
skyglow source sky
0
0
4 0 0 1 180
skyfunc glow groundglow
0
0
4 .4 .6 .38 0
groundglow source ground
0
0
4 0 0 -1 180