Viewer preferences

Multisampling:control the quality of the viewport drawing. Higher is nicer, but need more computation power.
Show FPS:show the FPS count
Background:change the background color
Default view:select the default view to activate when starting the application

4th axis

This panels configures the display of the 4th axis.

Rotary axis direction:
 the axis around which the rotation occurs
Rotary axis position:
 the position of the rotary axis

Camera

This panels configures the camera behavior.

Orbit:
Invert X axis:invert the rotation of the X axis while orbiting
Invert Y axis:invert the rotation of the X axis while orbiting
Sensitivity:sensivity of the mouse while orbiting
Orbit:
Invert X axis:invert the rotation of the X axis during pan move
Invert Y axis:invert the rotation of the X axis during pan move
Sensitivity:sensivity of the mouse during pan move
Orbit:
Invert zoom direction:
 invert the zoom direction when scrolling the mouse
Sensitivity:sensivity of the zoom

Grid

Major grid spacing:
 control the spacing of the major grid lines
Minor grid spacing:
 control the spacing of the minor grid lines
Major grid color:
 control the color of the major grid lines
Opacity:control the opacity of the major grid lines
Minor grid color:
 control the color of the minor grid lines
Opacity:control the opacity of the minor grid lines
Axis opacity:control the opacity of the main axes
Graduation size:
 the size of the graduation text