Graphics Modes During Dynamic Viewing

Graphics Modes During Dynamic Viewing

All dynamic viewing operations require a combination of two screen "meta" keys, ( <left control> and <left shift> ), and mouse buttons. The meta key(s) used dictates the graphics mode in which the image is transformed as follows:

<left shift>	+ <mouse>	Transforms the image in the current graphics mode. For example if it is a hidden-line plot, then dynamic viewing will take place in hidden-line mode.
<left control>	+ <mouse>	Transforms the image in "wire-frame" mode for the duration of the drawing operation. (ie no hidden-surface removal, or contours or lighting.)
<left shift> &} <left control>}	+ <mouse>	Transforms the image in pre-computed free-edge mode for the duration of the drawing operation. (ie wire-frame of free edges only, no hidden-surface removal, contouring or lighting.)

In the latter two cases the original drawing mode is always returned to at the end of the dynamic viewing operation. The wire-frame and free edge modes are provided to make transformations quicker for large models and/or slow computers: free edge is very fast.

For the last case, with <left shift> & <left control> held down together, the order of pressing and releasing the meta-keys matters: press <left shift> before <left control> , and release in the opposite order, otherwise you will (correctly) get the image redrawn in wire-frame mode as the <left control> key is pressed and released.