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Interaction:graphics

 Interaction techniques.

 At startup funcs creates a graphics window the contents of which can
 be manipulated either by commands and/or by certain interaction techniques.
 The window itself can be modified by command line options, by using window
 manager, or by the internal command 'window'.

 Main menu

 A menu appears by pressing the right mouse button inside the graphics
 window. The menu has, among others, a selection called 'Update Policy':
 this can be used to freeze display so that the program will not try to 
 update the graphics after every interaction or release it again after
 freezing. The submenu also has 'Update' entry, which can be used to see
 the results of users actions when continuous update is not on.

 See also: ilevel, play.


 Translating

 To move current object inside the graphics window press left mouse button
 and move the mouse while holding down the button. Pressing either of the
 SHIFT keys at the same time will result in translating in depth (no action
 if orthographics projection is on, scales the object when prespective
 projection is on).

 See also: translate,object,parent.


 Rotating

 Holding middle mouse button down and moving the mouse rotates current object
 about (object's own) x- and y- axis. Holding down the SHIFT key at the same
 time rotates the object about z- axis. Rotations can also be made from the
 dials: the upper left dial rotates about x- axis, the second from top about
 y- axis, and the third from top about the z- axis.

 See also: rotate,object, parent.


 Scaling

 Holding down both left and middle mouse buttons and moving the mouse
 vertically will scale the current object up or down. Scaling of an object
 can also be affected with the dials: the upper right dial scales in x-axis,
 the second from top in y- axis, the third in z- axis, and the bottom dial
 in all three axes at the same time.

 See also: scale,object,parent.

 Buttons

 F1 toggles fly mode, F2 reset camera settings and F3 reset object
 transformations.



