NAME

zshadecar, zshadeabstract, zshadeegg, zshadejet − shading and z-buffering demo

SYNOPSIS

/usr/people/mexdemos/zshadecar
/usr/people/mexdemos/zshadeabstract
/usr/people/mexdemos/zshadeegg
/usr/people/mexdemos/zshadejet

DESCRIPTION

These programs demonstrate advanced graphics features of the IRIS: cubic patches, depth cuing, z-buffering and Gouraud shading.  The objects are formed of bi-cubic patches. 

The first image to appear is a grey scale chart, representing the gamma corrected color map.  The next image is of lines connecting the basis points of the object.  From these basis points a cubic patch is derived, first shown as an array of points. 

Menu selections for invoking the various display modes are made by pressing one of the following keys:

KeyFunction
dturn on depth cuing
pdraw point display
sdraw as splines
woriginal wireframe
zz-buffer and Gouraud shaded version

To rotate the image, move the mouse in the X direction only. The mouse
buttons select the axis of rotation:
 LEFT mouse button rotates the car in X
MIDDLE mouse button rotates the car in Y
RIGHT mouse button rotates the car in Z

The usual way to operate the program is to rotate the wire frame or point surface interactively to the desired position and then smooth shade and z-buffer it. 

HARDWARE CONFIGURATION

A minimum configuration of 32 bitplanes, 1.5 Megabytes of memory, and Z-clipping is required. 

SEE ALSO

surfcar(1D)

AUTHOR

Henry Moreton

Version 3.6  —  December 20, 1987