RE: pincussion/barrel distortion

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Michael Jones (mtj++at++babar)
Mon, 19 Feb 1996 07:20:52 -0800

Gerk Huisma Writes:
:Is it possible to compensate for pincussion/barrel distortions
:(geometric abberations) of a lens ??

Yes. Here are some ways to do it:

 1. render the image a normal
 2. copy the image from frame buffer to texture ram
 3. render the distorted image:
    a) onto a grid with rectangular S&T but distorted geometry
    b) onto a grid with distorted S&T but rectangular geometry
    c) using projective texture onto curved geometry

The copy in step 2 is fast, and the second rendering pass of
step 3 is fast too.

Michael Jones

Be seeing you, Phone:415.933.1455 Fax:415.965.2658 M/S:8U-590
Michael T. Jones Silicon Graphics, Advanced Systems Division
mtj++at++sgi.com 2011 N. Shoreline Blvd., Mtn. View, CA 94039-7311
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