# Showing Fog in the Curta World

## Switching the Fog On/Off

Type FT or ft to Toggle the Fog between On and Off.

## Changing the Fog Density

- Type FI or fi to Increase the Fog density
- Type FD or fd to Decrease the Fog density

Notes:

- There is a fixed list of fog densities
- Changing the fog density is only possible if the fog is On
- the fog density is reset to the default when you reload the scene

## Fog Density readout on the Console

The current Fog setting is displayed at the console.
The distance you see is the visibilityRange. The distance where objects are lost in the fog

### To open the Console

- Right Click in the Scene
- Select Settings in the context menu
- Select Console in the next menu

## Changing the Fog Type

There are 2 different fog types:

- Linear: Linear increase in blending for better depth cueing effect
- Exponential: Exponential increase in blending for a more natural effect

To select the Fog Type:

- Type FL or fl to select Linear Fog
- Type FE or fe to select Exponential Fog

Notes:

- Exponential Fog is only available if the VRML Viewer is rendering using Open GL

  To set the BS Contact viewer to Open GL:

  - Right click in the world to open the context menu
  - Select Renderer
  - Select Open GL
  - Close the BS Contact viewer and restart it

- The Fog Type is printed to the Console
- Changing the Fog Type is only possible if the Fog is On

## Fog Colour follows the Background Colour

You can change the background colour at any time: the fog colour follows the current background colour.