9.5.2

866 • CHAPTER 18
THE SHADERS • 867
Turbulence, Octaves, Scale, Frequency
Turbulence values greater than 0 switch on the Noise shader. The Octaves, Scale and Frequency
parameters will then become available, which are standard noise parameters. A Frequency value
greater than 0 animates the noise with undulations.
Angle
Rotates the entire color gradient.
Absolute
If this option is enabled, the gradient refers to the turbulence only, not to the entire texture.
Space
For 3D gradients, this denes space that the gradient is calculated in.
Texture
The gradient is calculated in object space and remains the same regardless of object position or
orientation and takes into account the projection modications of the Texture tag.
Object
The gradient is calculated in object space and remains the same regardless of object position or
orientation, but does not use the attributes of the Texture tag.
World
The gradient is calculated in world coordinates and is not affected by the objects orientation or
position. This allows the object being shaded to move through the gradient.
Camera
The gradient is calculated in the space of the camera and will stay oriented relative to the camera. The
object can move through the gradient, and camera moves will also affect the gradient.