From: Anthony Bavuso (a.t.bavuso++at++larc.nasa.gov)
Date: 11/29/2000 10:50:54
Is there still SGI support for performer on this list? Is anyone at SGI
going to respond to my problem?
> -----Original Message-----
> From: Anthony Bavuso [SMTP:a.t.bavuso++at++larc.nasa.gov]
> Sent: Wednesday, November 22, 2000 1:43 PM
> To: info-performer++at++sgi.com
> Subject: 3 channels and pfEarthSky
>
> I am having problems with using pfEarthSky in three channels. I have read
> through the archives and found a similar problem to mine in 1999 with the
> subject 'Whatever happened to "Earthsky with 3 channels"' But I did not
> find a good solution that I can use.
>
> I am displaying an out the cockpit terrain database scene on 3 channels on
> 3
> pipes on an Onyx2 each channel having a 40 degree field of view and when
> combined has a total of 120 degree field of view. The 0 channel is on the
> left, the 1 channel is the center, and the 2 channel is on the right. The
> channels are in a channel group with channel 1 as the master and channels
> 0
> and 2 and slaves. My display projectors are all tiled 90 degrees for
> hardware reasons so I use pfChannel::setViewOffsets to offset each channel
> in roll and heading.
>
> ChannelNumber HeadingOffset PitchOffset RollOffset
> 0 (left) 40 0 -90
> 1 (center) 0 0 -90
> 2 (right) -40 0 -90
>
> When I share a common pfEarthSky set to the master channel, I observer the
> following: the sky on the left channel is black, the sky on the center
> channel is correct, and the sky on the right channel is deep blue.
>
> To me it looks like what is happening is that the pfEarthSky performs the
> view offset rotations in a different order than the pfChannel applies them
> for the eyepoint. It looks like the pfEarthSky first performs the roll
> rotation, then performs the heading rotation. Which explains why on my
> left
> channel I am rotated sideways in roll and then down in heading to see only
> black. On the right channel I am rotated sideways in roll and then up in
> heading to see the deep blue sky of the pfEarthSky model near the top of
> the
> sky.
>
This archive was generated by hypermail 2b29 : Wed Nov 29 2000 - 10:45:30 PST