passth(3G)passth(3G)NAMEpassth - passes a single token through the Geometry Pipeline
FORTRAN 77 SPECIFICATION
subroutine passth(token)
integer*4 token
PARAMETERS
token expects an integer which is used to mark specific sections in
input data so that when it is returned from the feedback buffer
the data is easier to decipher.
DESCRIPTIONpassth passes a single 16-bit integer through the Geometry Pipeline. Use
it in feedback mode to parse the returned information.
For example, you can use passth between every pair of points that is
being transformed and clipped by the Geometry Engines. If a point is
clipped out, two passth tokens appear in a row in the output buffer.
NOTE
This routine is available only in feedback mode; otherwise it is ignored.
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