9.5.2

860 • CHAPTER 18
THE SHADERS • 861
Speed
The Speed parameter is multiplied by the movement vector to allow the user to alter the speed of
translation with minimal effort. This allows for things such as water and re effects.
Absolute
On makes the value of the noise absolute, causing it to fold about its midpoint.
Cycles
Number of cycles the noise makes, between zero and one.
Low Clip, High Clip
Low Clip controls the bottom clipping value of the noise; values less than Low Clip will be clipped to zero.
High Clip controls the top clipping value; values greater than High Clip will be clipped to 100%.
Brightness
Brightness controls the overall brightness or value of the noise. Values greater than zero increase
brightness and values less than zero decrease brightness.
Contrast
Contrast controls the overall contrast or range of the noise. Values greater than zero increase the
contrast of the noise and values less than zero decrease the contrast.
Use As Environment
Causes the noise to be calculated as if it were an environment around the object being reected.
Project Environment
Causes the 3D Noise environment to be calculated based on a UV environment projection.
Compatibility
This option ensures that you get nearly the same result when rendering old SLA scenes.