zbuffer(3G) zbuffer(3G)
NAME
zbuffer - starts or ends z-buffer mode
SPECIFICATION
C zbuffer(bool)
Boolean bool;
FORTRAN subroutine zbuffe(bool)
logical bool
DESCRIPTION
zbuffer starts bool = TRUE or ends bool = FALSE z-buffer
mode. In z-buffer mode, each pixel has an associated z
value. To draw a pixel, the system compares the new z value
with the z value already associated with it. If the new z
value is less than or equal to the existing value (i.e.,
closer to the viewer), then a new color and z value are
stored in the bitplanes; otherwise, the color and z value
for the pixel are left unchanged.
zbuffer requires the special z-buffer hardware, which
provides 24 bits of z precision.
SEE ALSO
getzbuffer, zclear, setdepth,
Programming Guide, Section 12.1, Z-Buffer Mode
Page 1 (printed 8/20/87)