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# Emulate Knob Twist

knob id value

This command is used to emulate a "knob twist". Generally this command is used for display devices which have no actual knob peripherals (eg. tek). Any non-zero number entered for "value" is converted to 1 (if "value" is greater than zero) or is converted to -1 (if "value is less than zero). The user must enter the same command with "value" equal to zero to stop the action envoked by the knob twist.

The "id" defines which knob is to be "twisted":

x rotates about x-axis
y rotates about y-axis
z rotates about z-axis
X slew view in x direction
Y slew view in y direction
Z zoom the view
Examples: knob x 1
knob x 0
knob Z -1
knob Z 0