- The display area can be thought of as being illuminated by ambient lighting (i.e. low lighting from all directions) and up to four directional lights. By default ambient lighting and two of the directional lights are switched on by default. (The lighting has no effect if you are displaying everything in wireframe style.)
- To control the lighting, hit Display in the top-level menu followed by Display options... in the next menu. Ensure that you are on the Lighting pane of the resulting Display Options dialogue.
- Switch each light on or off by use of the Enabled check boxes.
- Each directional light lies along a vector direction which can be altered by typing in new values in the Position x, y and z entry boxes. (1,1,1) lies above the top-right of the screen, (-1,-1,-1) lies below the bottom-left.
- Any colour can be altered by clicking on the colour panel and selecting from the resulting palette (see Section 6.5.2). In the case of ambient lighting, the colour may be changed by clicking on the Diffuse ambient colour: panel and selecting from the colour palette.
- Diffuse colour refers to the general background lighting. Specular colour controls the colour of the reflections off atoms when displayed in space-filling mode. You can set the specular colour to black to remove these reflections completely.
- Hit the Defaults button to revert to default settings.
