Tom Jolley (jolley++at++fltsim.stl.mo.boeing.com)
Wed, 24 Mar 1999 09:38:49 -0600
I have seen similar problems. It looked to me as though the Z buffer wasn't
being cleared. The problem occured more often on the left and right channels
than the center channel. My solution was to write my own earth sky function.
Another problem with pfEarthSky that you may not have noticed is that the haze
doesn't curve. With the eyepoint level, the pixels from the horizon to the top
of the haze should be less at the center of the screen than at the left or
right edge. The greater the field of view, the greater the difference.
Looking back at the October 1994 archives, Michael Jones once wrote:
:We will ship with a new EarthSky model that adds new features, such
:as textured cloud layers and directional horizon glow, in addition
:to fixing the currently identified bugs.
:
:Anyone will comments on the EarthSky model is invited to email me
:(mtj++at++sgi.com) with your suggestions. Also, if you have written your
:own EarthSky model and want to advise us about special ideas that
:you would like to see included in our next release, I'd like to
:hear from you.
My guess is no one made any suggestions to Michael and therefore pfEarthSky
hasn't changed.
Joaquin Casillas wrote:
>
> Hello.
>
> I am working in a 3-channel visual simulation and I am having trouble
> with the pfEarthSky model (mode PFES_SKY_GRND or PFES_SKY_CLEAR).
> Whenever I do a 'hard' pitch turn, the earthsky model on the left and
> right channels are not drawing properly. It seems the framebuffer is not
> being cleared correctly in the ground area, like if I was using the
> PFES_SKY mode. The channels are arranged in a channel group, having the
> left and right channels a heading offset, and the earthsky model
> attached to the middle (master) channel.
>
> I am using Performer 2.2, Irix 6.5.1 on an Onyx2 IR.
>
> Any help would be appreciated.
>
> -----------------------------------------------
> Joaquin Casillas Melendez mailto:jcasilla++at++glup.irobot.uv.es
> LISITT (ARTEC) Phone: +34 6 364 2253
> Dept. Electr. & Informatics Addr: Poligono de la Coma s/n
> University of Valencia Valencia (SPAIN)
> -----------------------------------------------------------------------
> List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
-- Tom Jolley jolley++at++fltsim.stl.mo.boeing.com
This archive was generated by hypermail 2.0b2 on Wed Mar 24 1999 - 07:38:58 PST