VraySun Models

[Guest]

what's the difference between the 3 models? obviously they give different effects, but why/how?

Below doesn't really explain how each one works.

Sky Model - Allows you to specify the procedural model that will be used to generate the VRaySky texture.

- Preetham et al. - when this mode is selected the VRaySky procedural texture will be generated based on the Preetham et al. method.

- CIE Clear - when this mode is selected the VRaySky procedural texture will be generated based on the CIE method for clear sky.

- CIE Overcast - when this mode is selected the VRaySky procedural texture will be generated based on the CIE method for cloudy sky

[3DMK]

- Preetham et al. - This is your classic blue sky although has a tendancy to look hazy & blown-out

- CIE Clear - This method is also your Classic blue sky, but has less atmospheric haze which tends to give more contrast in the sky & a deeper more saturated blue

- CIE Overcast - This method produces a more diffuse & less saturated light that you would get in overcast conditions. It's virtualy grey.
**NOTE - When using Vray Sun with this setup you will need to increase the Sun size to get really soft shadows that this type of sky would produce.

Hope this helps

[raymarcher]

For the overcast you also have to lower your sun's intensity to 0 or something like 0.1 with indeed increased sun size to allow for softer sun shadows due to the diffusion of light sun by the overcast.

[Guest]

thanks for the info

[jacksc02]

James,
I have some videos on my vimeo page of some very basic tests I did of the different sun/sky modes with 1.5 SP4.
They are very rough tests but interesting to see the different effects

check them out here - http://vimeo.com/7079885