[Cst-1b] 99.6.4 Graphics

[Kevin Chan]

Hey Mo..... I had a look at the question and just worked out the answers
which don't agree with yours - forgive me if I am  wrong but it is late
afterall =)


1)  The Scaling is correct
2)  Think you first need to rotate about y axis by 22.62
3)  Then rotate about z axis by 53.13
4)  The final translation is correct

For the final part I would go with your break the concave polygon into
smaller convex polygons idea



----- Original Message -----
From: M.Y.W.Y.B. <mywyb2@hermes.cam.ac.uk>
To: <cst-1b@srcf.ucam.org>
Sent: Sunday, May 28, 2000 12:52 AM
Subject: [Cst-1b] 99.6.4 Graphics


> CST 99.6.4 Graphics
>
> First Part (rotate the cone)
>
> I'm not sure whether the values are correct. Could someone check against
> his/her values?
>
> 1) Scale: 4*x, 4*y, 13*z
> 2) Rotate about y-axis by -13.33 degrees
> 3) Rotate about x-axis by 22.62 degrees
> 4) Translage: x -1, y +3, z +7
>
>
>
> Last Part:
> Clearly the Sutherland algorithm doesn't work with concave clipping
poly's.
> What to do?
> Break it into smaller, convex poly's?
> Any other ideas?
>
> Cheers,
>
> Mo
>
>
>
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