Re: Far Plane Inaccuracy?

Michael Jones (mtj++at++babar)
Fri, 7 Apr 1995 00:49:27 -0700

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:A while back I had someone show me a anamoly on the RE. It might be prevalent
:in the whole Iris line. I set my far plane to be 100km and I placed a model at
:100km. Why would I not expect to see the polygons on this side of the far
:plane? I see nothing of the model until the far plane has been increased
:another 17.8km. Can someone explain this to me?

The Z value used is actually 1/z to bias resolution toward the
eye where it's most needed, the spacing between resolvable
distances increases as you move out from the eye. The Z
precision is actually related to (near-eye)/(far-eye), so
pushing the near plane out a bit can make a big difference.

What was your near plane distance?

-- 

Be seeing you,      Phone:415.390.1455  Fax:415.965.2658 M/S:8U-590
Michael T. Jones    Silicon Graphics, Advanced Graphics Division
mtj++at++sgi.com         2011 N. Shoreline Blvd., Mtn. View, CA 94039-7311

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