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#3336811 - 07/07/11 04:38 PM First flight...  
Joined: Jan 2004
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f15sim Offline
More projects than sense!
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Graham, WA
http://www.youtube.com/watch?v=Bx5eb5yTDQw


I finished something! I FINALLY FINISHED SOMETHING!

*laughs*

g.


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http://www.f15sim.com - The only one of its kind.
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#3336820 - 07/07/11 04:55 PM Re: First flight... [Re: f15sim]  
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The Nephilim Offline
S3D GuRu
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3rd Stone from the Sun !!
hi, i went to the link and seen a blank video nothing even played??


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#3336837 - 07/07/11 05:26 PM Re: First flight... [Re: f15sim]  
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Reschke Offline
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Awesome looking setup there Gene. I have been keeping up with this for a long time and a few questions keep coming back. With the background noise in the video I am assuming that is the vacuum to pull the display tight; so when you wear headphones or use the volume in game do they overcome the sound of the vacuum? Also I remember once that you were trying to accomplish this without the vacuum but it appears that you were unable to do so; so would any old vacuum work and have you considered moving the vacuum to any other area away from the computer but still attached via a longer hose to reduce the noise? I know that a vacuum works better the closer to the source it is pulling against but if you move it farther away would that effect the display any?


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#3336842 - 07/07/11 05:31 PM Re: First flight... [Re: f15sim]  
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Falstar Offline
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Looks great!

#3336844 - 07/07/11 05:37 PM Re: First flight... [Re: f15sim]  
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f15sim Offline
More projects than sense!
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Graham, WA
@The Nephilim - the video should play - it's just a regular YT video. You might try going to http://www.youtube.com/f15sim and see if that helps at all.

@Reschke - The vacuum is actually about 18' away and on the other side of a shelving partition. I still have a few things to do to completely silence it.

As long as you don't pinch the diameter of the feed line, you won't reduce the vacuum over a long distance. It just takes a bit longer to pull the mirror down because it would have to remove all the air from the feed line before it could start on the mirror plenum volume.

Thin film mirrors are really the only way to go with this - the solid form was a blind alley for me.

tnx.

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3336876 - 07/07/11 06:22 PM Re: First flight... [Re: f15sim]  
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MudPuppy Offline
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Appalachian foothills in Virgi...
That is too cool! Congrats on success of the project so far.
Derek

#3336904 - 07/07/11 07:09 PM Re: First flight... [Re: f15sim]  
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HitchHikingFlatlander Offline
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Wow congrats Gene that is truly amazing! But will it fit around the F-15? LOL!


I've got a bad feeling about this.....
#3336924 - 07/07/11 07:27 PM Re: First flight... [Re: f15sim]  
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f15sim Offline
More projects than sense!
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Graham, WA
Nope, won't fit the F-15. smile

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3336937 - 07/07/11 07:37 PM Re: First flight... [Re: f15sim]  
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AndyB Offline
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Ayrshire, Scotland
Hi Gene,
Like Resckhe I've been following your progress with interest. Very nice to see all your hard work finally paying off in such a spectacular way.

I suspect, like most of us, you'll be tweaking until the day they put you in your box .......

Well done !!!

Andy


Andy's simpit: http://www.simpit.me.uk
#3337203 - 07/08/11 01:23 AM Re: First flight... [Re: AndyB]  
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Cold_Gambler Offline
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Been following this for a while. Congrats on getting it finished!

Looks awesome in the video but I bet that's nothing compared to being there...


looks very modernishy-phoney-windows eighty-tabletty like

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#3337491 - 07/08/11 01:27 PM Re: First flight... [Re: f15sim]  
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f15sim Offline
More projects than sense!
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Graham, WA
Yeah, the video camera really can't do it justice. smile More map tweaking to do on the screen distortion, then comes the Need for Speed: Shift test! smile

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3338717 - 07/10/11 03:24 AM Re: First flight... [Re: f15sim]  
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Cali Offline
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Davis-Monthan AFB, Az
Nice job


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#3338731 - 07/10/11 04:02 AM Re: First flight... [Re: f15sim]  
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f15sim Offline
More projects than sense!
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Graham, WA
Thanks! I've got a Need for Speed video I'll be posting this weekend.

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3339880 - 07/11/11 10:03 PM Re: First flight... [Re: f15sim]  
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choowy Offline
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Hey Gene, congrats on a really impressive build. Look forward to seeing it in action, nicely done!!

#3339960 - 07/12/11 12:13 AM Re: First flight... [Re: f15sim]  
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Grim_Death Offline
Old School
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sweet


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#3341359 - 07/13/11 11:48 PM Re: First flight... [Re: f15sim]  
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metalnwood Offline
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Gene, that is looking very cool! I am very happy for you smile

I have a question about fs rendering or other games for that matter. I know when using triple screens the side monitors stretch the image. This isn't so bad for some stuff as your focus is at the center monitor and because I use trackir when I look to the side and am still mostly looking at the center monitor.

With your setup you are not using track ir so I wondered if you had one large eyefinity type display or were you rendering the front and each side separately.

On a similar note, the software you use to create a map to remove distortion, can that be used to compress the stretching that happens on games that do not support rendering 3 screens separately?

Anyway, looks great!

#3341425 - 07/14/11 03:03 AM Re: First flight... [Re: f15sim]  
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wledzian Offline
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Any image generated as a single perspective window will have stretching towards the edges. This is an unavoidable consequence of a perspective projection. Another consequence of a single perspective projection is that it is geometrically impossible to reach 180°, and the distortion gets really bad as the FOV gets large.

To get around this limitation, we're using 3 separate windows in FSX. That can be used to eliminate the stretching, but cannot produce more image than is generated, as in a game that uses only a single window won't ever be much good over ~120°, if you're looking for a 'correct' image. With FSX, because we're using three separate windows, we are able to go beyond 180°. I emphasize 'correct', as Need for Speed (a single-window game) looks absolutely incredible, even when it's stretched to 210°. Since you're not paying much direct attention to the sides, it's just peripheral vision and adds tremendously to the immersion. FSX, on the other hand, would feel strange and make pattern-flying difficult if the view directly to the side were showing something that was significantly in front of me.

Keep in mind that we're using a trial license of Sol7 at the moment, which has the capability to apply the screen fitting warp as well as a secondary geometry-correcting warp. There's a good chance we'll go back to NThusim at some point, as Sol7 on 3 channels retails for ~$6000. NThusim is capable of removing the distortion, but is only configured with an alignment routine to fit a rectangular grid to your screen. If you want to correct the distortion further, you need to know what the grid should look like when the image has been corrected, and make it look like that on your screen.

#3342050 - 07/14/11 10:24 PM Re: First flight... [Re: f15sim]  
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frans42000 Offline
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Well I'm an avionics technician from Duncan Aviation. I just finished some training on the Cessna Sovereign at Flight Safety in Wichita.

Part of our training was hands on time with one of their real full motion collimating display cockpits set up with the Sovereign cockpit and Epic avionics. What a blast.

I have to say, I'm impressed by this project. I hope that you guys keep at this because I'm hoping to try to make one of these myself soon. I've been bitten by the simpit bug.

I'm curious how you came up with the dimensions for the Mylar support structure?

Anyway, great job guys.

#3342178 - 07/15/11 02:58 AM Re: First flight... [Re: f15sim]  
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f15sim Offline
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Graham, WA
Thanks! You've got a fun job I bet. smile The dimension was picked out of the air - it just happened to be the right size for the max Mylar size we could get. I had no clue about it until Wayne got involved - I was going to use a different system all together (that would have not worked).

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3342223 - 07/15/11 04:33 AM Re: First flight... [Re: f15sim]  
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wledzian Offline
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Yep. The frame dimensions were a lucky accident. I had done some design work independent of Gene, and used a 4' radius as the largest mirror I could fit in my office. I don't know exactly why Gene chose 40° from the equator down, but the math showed that we could work with it. It worked well when we built the prototype, so we stuck with it.

The screen dimensions, on the other hand, were not so random. I spent a good couple weekends programming a spreadsheet to calculate the required screen geometry when given an eyepoint and desired field of view. By picking a field of view and using it to locate the eyepoint, the program spits out the screen shape.

It was pure luck that:
- Gene had selected the same 4' radius that would fit in my office.
- The geometry that Gene had already used for his first frame worked out well.
- His existing racing pit fits under the mirror with the eyepoint in just the right spot
- the widest Mylar we could find is just barely big enough to cover the 210° FOV we wanted (three 60° frame segments plus ~15° usable in each 'ear')

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