IRIS 3010, Руководство пользователя

Страница: 125 / 145

Version 1.0 SERIES 3000
IRIS OWNER’S GUIDE 9-7 Demonstration Programs and Gifts
The commands to manipulate the shuttle and control depth-cuing are the same
as those for jet . Any alphanumeric key starts or stops the doors flopping open
and closed. The motion does not continue after the program is detached.
Shaded Object and Curved Surface Demonstration Programs
The IRIS uses special microcode and hardware to draw Gouraud-shaded, z-
buffered images rapidly. The Geometry Engines provide the capability to
manipulate splines in real-time. The surface design and rendering
demonstration package shows off these features. It allows you to modify the
basis points that determine a curved, wireframe surface in one window and
pass them to another window where a smooth-shaded, z-buffered rendering of
the surface is made. The package consists of two programs: a surface editor
and a rendering program.
Surface Editor
Start the surface editor window by using any of these commands: surfcar ,
surfegg , surfabstract or surfjet . Any of these commands runs the same program
with different sets of basis points. Before you can interact with the surface
editor, select the window for input.
The surface editor has two parts. The upper part of the display is the
wireframe surface and the control points that define it. The bottom of the
window is a menu of seven screen iconic buttons.
The simplest use of the surface editor allows one to edit the displayed surface
by manipulating its basis points. To do this:
1. Move the cursor (now shaped like the mouse) clear of the window.
2. Press the mouse buttons one at a time and observe the glyphs.
LEFTMOUSE gives a stylized arrow in the x direction,
MIDDLEMOUSE gives one in the y direction, and RIGHTMOUSE
gives one in the z direction.
3. Move the cursor into the top half of the display. Pick a basis point
with the mouse, select a direction to move it, push the
corresponding mouse button, and move the mouse from left to right
to move the point. As the basis point is moved, the portion of the
surface directly affected by the point is modified in real-time.
4. Now look at the menu which is lower in the display. The leftmost
two screen buttons are for viewing the surface. The rightmost five
screen buttons are for editing the surface. The leftmost screen
button, the one showing three mutually perpendicular axes, is for
rotating the surface 90 degrees around a particular axis. Move the
cursor over the leftmost screen button and press and release
LEFTMOUSE. The surface rotates 90 degrees around the x-axis .