FSTORM SUN LIGHT
FStormSunLight emits only sun light without sky light. For sky light FStormSkytexture must be placed to FStormRender environment slot.
on enables/disables sun light.
power sets sun light intensity.
turbidity sets sky turbidity.
density sets sky density.
size sets sun size multiplier. 1.0 matches to real sun size.
targeted if on, sun direction calculated based on sun target position.
if off, date and time settins are used.