RE: Distortion Correction

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Dick Rous (Dick++at++demeern.sgi.com)
Mon, 23 Aug 1999 22:07:23 +0200

The only practical solution when projecting onto a spherical or
cylindrical screen, is to "distort" the output of the projectors
to produce a geometrically correct, continuous view, in conjunction
with edge blending.
To adjust the projectors, one should use a model of a wire-mesh
sphere originated at the origin, with the viewpoint at the origin.
I neccessary, feel free to contact me for details.

Cheers,

__________________________________________________________________
Dick Rous Senior Systems Engineer Graphics Technology
email: dick++at++sgi.com European Technical Support
phone: +31-30-6696868 fax: +31-35-6423162 VNET: 955-6868
__________________________________________________________________

-----Original Message-----
From: Miguel Lozano [mailto:miguel++at++glup.irobot.uv.es]
Sent: 23 August 1999 12:27
To: info-performer++at++sgi.com
Subject: Distortion Correction

pfHello everyone, I need some help in some "curved questions" and I hope
you can help me .

The main question is how can I correct the distortion produced in the
projection of flat images onto a curved screen.

I think there is a Sw solution (review OpenGL Advanced98 Notes) using
texture mapping and although I donīt know exactly how to apply this
solution, it seems to me too much expensive in terms of computational
cost, but I'm really not sure about it .(Anyone has applied this
solution and works fine?)

I wonder also if anyone has tryed to modify the Projection matrix to
avoid this problem, and if its also possible this kind of solution?

In terms of Hw solution, anybody knows if a general Hw solution exists
to correct this distortion?.

My system consist of 3 SGI IR. and three MultiScan VPH-G70VR SONY
projectors.

Any idea about these questions would be very appreciated.

Thanks in advance.

-------------------------------------------------------
Miguel Lozano Ibáņez e-mail:miguel++at++glup.irobot.uv.es

Grupo ARTEC
Instituto de Robotica Tel: +34 6 364 2253
Universitat de Valencia Fax: +34 6 364 4841
Poligono de la Coma s/n
46071 Valencia (SPAIN)
-------------------------------------------------------

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