Scripting Guide - SAS

434 Three-Dimensional Scenes Chapter 13
Setting the Viewing Space
This defines a 45 degree viewing angle, with a near plane 3 units from the viewer and a far plane 7 units
from the viewer.
The viewing angle functions in the same way as a wide angle or telephoto lens on a camera. Small viewing
angles zoom into a drawing, while wide angles zoom out. In other words, a small viewing angle maps the
screen space onto a small portion of the scene, resulting in apparently larger scene elements. A large viewing
angle maps the screen space onto a large portion of the scene, resulting in apparently small screen elements.
The size of scene elements can therefore be manipulated using the angle parameter of the Perspective
function. The picture here shows the hello world script with perspective angles of 45 and 90 degrees.
Figure 13.6 Changing the Perspective
scene