Hi Stuart,
Unfortunately, the cockpit, projector system, and screen are currently being
redesigned and rebuilt so unable to provide any additional info or pics. It was
disassembled for our move from California to Colorado and using this as an
opportunity to do some improvements in the structure and appearance in
anticipation of using Gene's collimated mirror system;
Thank you for the marvelous work on the clouds. Flying through and around them
with the wrap around 180 degree cylindrical screens was great fun. Folks who
flew the sim said they needed a few minutes to get their legs back under them
after stepping out of the cockpit. The collimated system is going to blow their
minds!
Using monitors will not show the blending areas and overlap Thanks again for
the explanation. Let's put this on the back burner for now. Probably 4-6 months
before it all comes together. OTOH might be able to just setup the projectors
and throw the images onto some white board or a wall. If I find the time will
give it a go and make certain it is not operator error at this end and then
send over some pics.
Cheers
John W
----- Original Message -----
From: "Stuart Buchanan" <stuart13@ gmail .com>
To: " FlightGear developers discussions" <flightgear-devel@lists. sourceforge
.net>
Sent: Monday, June 18, 2012 7:46:35 AM
Subject: Re: [Flightgear-devel] Slow frame rates
Hi John,
As the author of the 3D clouds system, and the OSG random buildings/objects
re-implementation, this is obviously an area of interest to me :)
Comments inline below.
On Mon, Jun 18, 2012 at 2:20 PM, wrote:
> By way of an example, consider the 3D cloud system.
>
> Given a three projector system, each CPU is configured in a similar manner
> as before for a multi-monitor system; i.e. there is a master FDM , the slave
> FDMs are disabled and each CPU is bound to a display. I don't recall the
> exact syntax but for those who have run multi-monitor display systems you
> understand. The doc files and readme's provide a good description of how to
> implement this configuration for those not familiar with the setup. The
> down side in this approach is that each CPU creates it's own graphics
> context and dynamic/random scenery objects are not sync'd . It has been a
> year or two since I last spent any time digging into or running FlightGear
> with master/slave machines. The current 737/747 sim runs on a single CPU
> with three projectors to make use of all the "eye-candy". But I believe the
> above assertion is still true.
I think random scenery objects, trees and buildings are placed based on the
terrain tiles, and a random seed generated statically for each tile.
So, it should be the case that the same set of random objects are generated
for a tile no matter what the graphics context, and the same set of objects
should be generated each time the sim is started. Put it another way: Random
object/building generation should be completely deterministic.
If that's not the case, then there's a bug I should look into.
> In the case of the cloud system, something similar might be possible.
The 3D cloud system generated by "Basic Weather" is generated based on the
position of the viewer when the clouds are generated. For a multi-computer
system, starting position will be the same, so the same set of clouds
should be generated on each computer. (I should double check the random
seed generation is correct just in case). Again, if that's not the
case it's probably
a bug.
I don't think the problem is a lack of a shared memory OSG tree.
I think the issues you have with objects "ending" at the screen boundaries is a
different one. Could it be due to over-aggressive culling?
Could you explain in a bit more detail what is wrong?
Unfortunately I don't have a multi-computer setup to be able to test this
myself, so I'll need a bit of help really understanding the problem.
Screenshots
will probably help.
-Stuart
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