EYE SHIFT Control

           

This command is used to shift (translate) the model.

Note that when the Open GL driver is available dynamic rotate, zoom and pan are activated with <CTRL> and the left, middle or right mouse buttons respectively.

Control Comments

/CURSOR The cursor is positioned twice to indicate a `from' and `to' position for the applied shift. Note that the cursor hit positions must be within the current viewport. (see note 1)

ndc1 ndc2 The shift is specified in terms of a `from' and `to' pair of x,y normalised device co-ordinates (ndc). (see note 1)

XYZ dx [dy] [dz] The shift is specified by giving distances in model coordinates for translations in the screen X, Y and Z directions. Note that with this command it is the eye that shifts, rather than the model. Note also that the positive Z direction is out of the screen (towards the user).

Notes:

1.

Cursor and ndc shifts
These have the effect of dragging the model from the `from' position to the `to' position; so it is the model that shifts rather than the eye.

Examples:

1.

EYE SHIFT .5 .5 .6 .5

The model is moved .1 normalised device coordinates along the screen x-axis.

2.

EYE SHIFT XYZ 10 10 10

The eye is moved 10 model coordinates along the screen x-axis, the screen y-axis and the screen z-axis.

3.

EYE SHIFT XYZ 0 250

The eye is moved 250 model coordinates along the screen y-axis.