[simpits-tech] Simpits-tech Digest, Vol 62, Issue 17

[KD]

With the dome, you need to have a special fisheye lens that can stretch 
the images into the curve. This requires that the projector lens be as 
close to the spherical center of the dome as possible. This type of lens 
stretches the image a bunch at the edges creating size distortions and 
pixelation. There is also some screen door efect in the curved dome 
since the image needs to cover so much area, that the images is huge. 
The flat projection screens can use a bunch of high res projectors to 
each cover a portion of that. It also makes merging the edges of the 
images easier when the edges are straight lines. Merging the edges of 
sperically correcte images requires more processing power. Power that 
can better be used for framerate or image detail processing.
See the video here: http://www.etctacticalflight.com/  to see what the 
dome visual looks like. It doesn't wrap around as far as the MDART 
pentagons do.
Here is a shot of a dome in a space simulator: 
http://www.nastarcenter.com/press/module2.htm The big THING hanging down 
in the middle is a projector. Checking your six with this in the way is 
an adventure.

I'm waiting for vacuum formable OLED matrix with a good resolution. Then 
we'll just form the screen into a big bubble, and put the sim inside it :)
One of the funnier things I find is that the government requires a 60Hz 
framerate for their sims. Some of the guys I used to fly IL2 with 
weren't happy with anything less than 100. Said it looked jerky at less 
than that.

K

>
> Why does the Air Force?use a dome shaped like the one is this photo http://www.usminc.com/trainers/cockpit_08.html?rather than one that is rounded?
> ?
> Justin
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