# The render options box : scene tab

## The scene tab.

Scene options are global options for a povray scene.

Ambient light

Ambient light is used to simulate light that comes from undefined light sources, because it was refracted / reflected too much. It gives scene a more realistic touch.

Number of waves

Optionnal parameter to modify wave and ripple patterns aspect. Changes the density of these patterns.

Irid Wave lenght

Modify Iridescence aspect. Default values are closed to natural values but you may try other settings for funny effects.

Global noise generator

There are three noise generators implemented.

- Povray 3.1

  the noise that was used in POV_Ray 3.1.

- Range corrected

  range corrected version of the old noise, it does not show the plateaus seen with type 1.

- Perlin Noise