Re: How to get smooth horizon with channel group ?

New Message Reply Date view Thread view Subject view Author view

Avi Bar-Zeev (cyranose++at++realityprime.com)
Mon, 25 Jan 1999 09:18:44 -0800

To extend a little bit on Angus' comments, consider that
each channel is designed to be drawn on a flat screen.

In your three channel configuration, it sounds like you
would set up three projection screens or monitors such
that they are 60 degrees apart. If you put your head at
the spot corresponding to the virtual camera, these three
flat screens will appear correctly. The sharp bend you
see on a single screen will disappear form that pov.

Now, some people do actually want to project 180 degrees
on a single flat surface. So in that case you need to do
some image warping (e.g., render once, read the framebuffer, and
re-render onto a polygon mesh), with Angus and Don Burns have done
a lot of work on.

----- Original Message -----
From: Angus Dorbie <dorbie++at++sgi.com>
To: <czg++at++iname.com>
Cc: pfMailList <info-performer++at++sgi.com>
Sent: Monday, January 25, 1999 8:16 AM
Subject: Re: How to get smooth horizon with channel group ?

>This SHOULDN'T be smooth.
>
>Multi-channel scenes like this work with multi-projector displays. If
>you show it on a single monitor then the geometry of your projections
>does not match the geometry of your display w.r.t. the observer.
>
>Cheers,Angus.
>
>Cao Zhigang wrote:
>>
>> Dear pfFriends,
>> In our flight simulator, I use channel group ( 3 channels) to get
>> 180 degree total horizontal field of view ( 60 degree per channel).
>> The scene looks not smooth, channel joint is fold, the scene horizon
>> as following picture (h=0.0f,p=15.0f,r=0.0f).
>> I've tried increasing channel number (such as 12 Channels),
>> unfortunately, the system performance degrade greatly.
>> How to generate continous scene in multiple-channel situation?
>> Does anybody have good idea about this?
>>
>> Thank you for any help.
>>
>> Lei lixing
>>
>> E-mail:flysiml++at++public.bta.net.cn
>>
>> ------------------------------------------------------------------------
>> [Image]
>
>--
>"Only the mediocre are always at their best." -- Jean Giraudoux
>
>For advanced 3D graphics Performer + OpenGL based examples and tutors:
>http://www.dorbie.com/
>=======================================================================
>List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Jan 25 1999 - 09:23:53 PST

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.