This gamma correction operator gets
its input from a radial gradient source. This is modeled
with the left orange connection. The mesh sink on the
right is connected with a second orange connection to get
the gamma operator values. The gamma parameter is set
manually to 1.5 by the user. This gamma parameter is
additionally influenced from a linear gradient source.
This source is connected with a blue connection to the
'ga' control input of the gamma operator. All control
inputs are multiplied with the manually adjusted
parameters. In this example the gamma parameter ranges
form 0.0 on the left, to 1.5 on the right.
To establish a control connection
drag the left mouse button LMB from the
source node exactly to the control area of the sink