Versions Compared

Old Version 24

changes.mady.by.user 3Delight

Saved on

compared with

New Version Current

changes.mady.by.user Maxime Bourassa

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.


Section


Column

The 3Delight Sky is a utility node that can be used for image based lighting of daylight conditions. It is very well suited as a fast lighting rig. 3Delight can extract sharp shadows using this shader so that no directional light is needed to cast shadows from the sun.

This shader is based on the Hosek-Wilkie sky model. It is an analytical model of the daytime sky that includes the latest improvement in this field of research. This model is able to properly picture sunsets and lighting in high turbidity environments - such as lighting during a moist day.

Image Added



Column
width30%35%


toc
Panel

...

borderColor

...

#e0e0e0

...

bgColor

...

#f0f0f0

...

titleColor

...

#444444

...

Intensity

...

This drives the overall intensity of the sky. It is a direct multiplier of the sky radiance function.

Image Removed

Intensity 1.0

Image Removed

Intensity 1.5

Image Removed

Intensity 2.0

...

Turbidity 

...

This parameter determines the overall aerosol content of the air. As an example, a moist day will have higher turbidity values than a dry day. Values range between 1 and 10.

Image Removed

Turbidity 1.0

Image Removed

Turbidity 4.0

Image Removed

Turbidity 10.0

...

Ground Color 

...

Changing ground color affects the brightness of the whole sky-dome, especially in high turbidity settings. High albedo values can occur in winter scenes - snow reflectance is very bright so almost all incident radiation is reflected and backscattered towards the viewer.

Image Removed

Ground Color is white

Image Removed

Ground Color is green

Image Removed

Ground Color is blue

...

Elevation

...

This the elevation of the sun.

Image Removed

Elevation 5

Image Removed

Elevation 20

Image Removed

Elevation 40

...

Azimuth 

...

This is the azimuth of the sun.

Image Removed

Azimuth 90

Image Removed

Azimuth 180

Image Removed

Azimuth 270

...

Sky Tint

...

Image Removed

Sky Tint is white

Image Removed

Sky Tint is red

...

Sun Tint

...

Image Removed

Sun Tint is white

Image Removed

Sun Tint is red

...

Sun Size

...

The size of the sun in the sky, in degrees. The default value (0.51 degrees) is the size of the sun as seen on earth. Note that changing the size of the sun doesn't affect the overall radiance of the sky in this model but the objects will receive more light, as seen in the images below.

Image Removed

Sun Size 0.51

Image Removed

Sun Size 1.51

Image Removed

Sun Size 3.51

...

Draw Sun Disk

...

Draw Ground

...

 

titleContent:

Table of Contents



 

 

Excerpt Include
SFRP:3Delight Sky
SFRP:3Delight Sky
nopaneltrue

Quick Start and Example Scene

Section


Column
width20%

 


Column
width60%


 

 


Column
width20%

 


An example Maya scene can be found here: sky-example.ma

Quick Start and Example Scene

  1. Open 3Delight's Render Globals
  2. In Render Elements,  make sure that the environment shader is used for the Background Fill
    Image Removed
  3. Create an environment light by clicking on the checker boarding facing Environment Light
    Image Removed
  4. Click on AE to open the environment node in the Attribute Editor
  5. Click on the checkboard icon to connect our 3Delight Sky shader to the Texture parameter
    Image Removed

Start by opening the 3Delight render options: