9.5.2

320 • CHAPTER 7
OBJECTS MENU • LIGHTING • 321
Visible Light
Denes the visibility of the light in a scene.
No Illumination
If you need to see just the visible light and/or its lens effects without the light source actually
illuminating objects, enable this option. Should you need your light sources for special effects (such
as the exhaust gas of a jet engine) enable this box for faster rendering.
Ambient Illumination
Ambient illumination. Ambient illumination with Falloff enabled.
Normally the brightness of a surface is determined by the angle at which a ray of light hits it. The
greater the angle between the ray and a tangent to the surface, the more the surface will be lit by the
light. When Ambient Illumination is switched on, however, this physical law is waived. Here the angle
does not matter. All surfaces are lit with the same intensity. This results in a much atter look. Only
the material color is considered in the lighting calculations.
With both Ambient Illumination and Falloff enabled for the light source, you can lighten specic
regions of your scene in a similar way to how you darken them with Negative Lighting, explained
earlier.
Show Visible Light
Enable this option to show an approximation of the visible light in the viewports, not to be confused
with illumination. Again, this range can be interactively adjusted via its handles.
Show Illumination
If this option is enabled, a wireframe approximation of the light’s illumination is shown in the
viewports. This range can be adjusted by dragging the handles of the wireframe representation.