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From: bgh@ice9.uucp (barry hannigan)
Newsgroups: comp.graphics
Subject: clipping algorithms
Message-ID: <1991Feb12.070730.1051@ice9.uucp>
Date: 12 Feb 91 07:07:30 GMT
Sender: bgh@ice9.uucp (barry hannigan)
Organization: maas neotek
Lines: 18

i'm building a graphics interface to a engineering simulation system my company
is developing and am looking for information on which clipping algorithm might
be best suited for the job.

the data involved is in the form of polylines representing surface features
and a two dimensional grid of surface elevations. the coding language is C, 
with the polylines stored as a linear array of x1, y1, z1, x2, y2, z2...

the current implementation uses the 3d version of the evans-sutherland algo on
a R3000 based workstation, with porting to the RS6000 probable. the line 
segments between data points are on the order of 20 metres long along the 
polylines, with the area being modelled 7km by 5km. in operation, aprox. 10%
will be within the viewport at any given time.

thanks, barry

-- 
~~~~~~~ ..walkin on the beaches, lookin at the peaches