Re: Whatever happened to "Earthsky with 3 channels"

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Angus Dorbie (dorbie++at++sgi.com)
Mon, 12 Jul 1999 14:15:44 -0700

Have you tried unsharing and just addint the sky to all channels or
creating multiple earth skys?

Cheers,Angus.

Russell Suter wrote:
>
> Hi,
>
> I was looking through my archives of Performer stuff I was interested
> and
> ran across the thread titled "Earthsky with 3 channels" posted by
> Joaquin Casillas in March of this year. I checked the archives and saw
> no resolution to the problem. To refresh, the origional posting was:
>
> 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.
>
> Well, I see the same behavior on my Onyx2 IR/Peformer 2.2/Irix 6.5.3 and
> I believe this to be a bug in the EarthSky model. As explained by
> Joaquin, it occurs in a high pitch turn and the ground part of the
> channel
> doesn't clear. For me it is only in the left and right channels and not
> the center channel. I suspect it is because of the angular offset for
> the left and right channels is not being accounted for when the channel
> clear takes place.
>
> I checked the archives and didn't see any final resolution on this.
> Does
> anyone have an answer on this one???
>
> --
> Russ
> ____________________________________ ___________________________________
> Though my eyes could see | Russell Suter
> I still was a blind man. | Voice : (303) 858-0085 x1262
> Though my mind could think | Fax : (303) 858-4004
> I still was a mad man. | Internet : russell++at++symsystems.com
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-- 
For years now, whenever NT has been proven to have some debilitating
weakness we've heard from MS advocates that NT would catch up, there was
just an incredible faith in this OS and Microsoft's ability to somehow
get there. With the recent results of the Linux vs NT serving benchmark
that same attitude can be seen in the Linux community. The Linux folks
aren't too worried, "Sure the single threaded IP stack was slow but
it'll be fixed in the next release.", it's eerily familiar but I have
confidence in the Linux community's ability to remedy problems and I
don't groan in pain as I used to when Microsoft made similar claims.


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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