NAME

passthrough - passes a single token through the Geometry Pipeline

SPECIFICATION

C
passthrough(token)
short token;

FORTRAN
subroutine passth(token)
integer*4 token

Pascal
procedure passthrough(token: Short);

DESCRIPTION

passthrough passes a single 16-bit integer through the Geometry Pipeline. It is useful in feedback mode to parse the information returned. Suppose, for example, that points are being transformed and clipped by the geometry engines. If passthrough is used between every pair of points, then if a  point is clipped out, two passthrough commands will appear in a row in the output buffer.  This command is very dangerous to use when not in feedback mode − it has the effect of sending a random command to the raster subsystem. 

NOTE

Should be used only in feedback mode. 

Version 2.4  —  May 08, 1986