Atmosphere

There are two main effects that are approximated by the atmospheric model. They are:

• Aerial Perspective
• Sky Colour

Aerial perspective is the phenomena that causes objects in the distance to appear different colours. For example, during the day objects in the distance often look "bluer" than objects in the foreground. By the same effect, objects in the distance often look redish during a sunset.

No Atmosphere This image was rendered without any atmospheric effects. I used a constant blue colour for the sky.

Calculated Sky Turbidity: 2.5 This image has a sky that has been calculated by the atmospheric model. As you can see the colour is no longer constant as in the first image.

Turbidity: 3.5 This image shows the effect of increasing atmospheric turbidity.

Turbidity: 4.5 This image shows the effect of further increasing atmospheric turbidity.

Aerial Perspective (A turbidity of 2.5 was used for the following images) transparency bias: 1.0 opacity bias: 0.2 Aerial perspective calculations are enabled for this image. Notice that objects near the horizon take on a slightly more blue hue.

transparency bias: 0.25 opacity bias: 0.6 This image is also using aerial perspective to simulate conditions at dusk.

transparency bias: 2.0 opacity bias: 0.0 This image has exagerated aerial perspective. This makes distant objects look more blue than normal, and the sky is extremely bright blue. This even effects the colour of the water since it reflects the sky.