Noise_generator

### 6.11.10 Noise_generator

There are three noise generators implemented.

- `noise_generator 1` the noise that was used in POV_Ray 3.1
- `noise_generator 2` 'range corrected' version of the old noise, it does not show the plateaus seen with `noise_generator 1`
- `noise_generator 3` generates Perlin noise

The default is `noise_generator 2`

Note: The noise_generators can also be used within the pigment/normal/etc. statement.