Where to start projectors curved screen project ?

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Postby Guest » Tue Sep 16, 2014 6:10 pm

Hi there,

I'm new registered on this forum, I found this adress with BHawthorne awesome projects. I used to have a 3*27" (1920*1080*3) configurations but I stopped because of deformation of objects on the side which was really unconfortable on planes sims and Battlefield. I have now a LG34UM95 which is really awesome.

I essentially play to Battlefield and DCS World and I started to think about this project seeing this video :
Watch on youtube.com
, it's really awesome.

I have the luck to have a room for playing (and a nice wife for let me play ), but I would like to know where to start the project ? Budget is not the first point.

I can do the screen myself with wood or metal and isorel, I have a 3.6m (12feets) side room.

Do I have to make a circular or parabolic screen ? which radius ? 2 or 3 projectors ? 120/180° ? I don't know the beginning because possibilities are limitless.

Thanks for your help !

I would make a tutorial with this project for other people. I would probably post this on sims forum.

Dureiken
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Postby BHawthorne » Wed Sep 17, 2014 11:17 am

Greetings, I should have time tomorrow to answer in a bit of detail. I should be able to give you most of the answers you're seeking though. :)

-Brad
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Postby Guest » Thu Sep 18, 2014 2:46 am

Ok thanks a lot !

I think I will go with BenQ W1080ST which seems to be a really good choice, I started to draw on a CAD tool

waiting for your answer !
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Postby The_Nephilim » Thu Sep 18, 2014 12:45 pm

dureiken wrote:Hi there,

I'm new registered on this forum, I found this adress with BHawthorne awesome projects. I used to have a 3*27" (1920*1080*3) configurations but I stopped because of deformation of objects on the side which was really unconfortable on planes sims and Battlefield. I have now a LG34UM95 which is really awesome.

I essentially play to Battlefield and DCS World and I started to think about this project seeing this video :
Watch on youtube.com
, it's really awesome.

I have the luck to have a room for playing (and a nice wife for let me play ), but I would like to know where to start the project ? Budget is not the first point.

I can do the screen myself with wood or metal and isorel, I have a 3.6m (12feets) side room.

Do I have to make a circular or parabolic screen ? which radius ? 2 or 3 projectors ? 120/180° ? I don't know the beginning because possibilities are limitless.

Thanks for your help !

I would make a tutorial with this project for other people. I would probably post this on sims forum.

Dureiken



1.Well I would say start with a Budget of some sort.. Projectors can cost as little as $400 all the way to over $10000. now if you say you don't have a budget then the choice is simple get 3 Christie 3D DLP Projectors and Tridef 3D,, haha j/K

2. IF we had a price range to work we can get you to find a decent DLP Projector?? Let me ask you do you know the resolution you at least want, 1080P, 720P for each Projector??

3. Which Video card do you like to use would it be AMD or NVidia?? knowing this is important as we can give you an idea of how many projectors you can run.. With NVidia it will be 3 in Surround mode.. I think AMD can do more and at least can goto 2.. Brad has some AMD stuff maybe he knows the max I think it is 6?? but to drive DCS and 3 Screens at 1080P is going to take some serious Horsepower probally even SLI or Crossfired.. Remember DCS E.D.G.E is almost upon us might be prudent to wait until then or just the Most Powerful Video card you can afford and maybe 2..

Once we have a budget of sorts we can start narrowing down to How big an image do you want?? You said the size of your Room but what kind if image size do you want.. I know you will probally want to go with ShortThrow Projectors (Bigger image shorter distance too screen)..

Having known what I know know I would have gotten the Optoma 720's that are short throw and 3D Capable.. Would have ment a bigger image but I am happy with the current size and shape..



Well I have a curved screen that is image wise 3'x10' I use 3 Acer X261P DLP NVidia Certified Projectors..
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Postby BHawthorne » Thu Sep 18, 2014 1:36 pm

Several helpful answers from The_Nephilim in the above post. I'll add a few things too. :)

Be mindful that projection setups still can have the side deformation issue on games that don't have special custom camera capability. Flight sims like DCS World, FSX and P3D are all ok with custom cameras, but games like Battlefield 3/4 are still going to have the barrel distortion because of how the game camera code is setup. Nthusim doesn't magically fix that sort of thing -- it's primary purpose is to calibrate the projection to the screen surface and seamlessly blend multiple projections together. It's still tied to a spanning mode such as AMD Eyefinity, Nvidia Surround or Matrox GXM. That being said I still have a lot of BF3 and ArmA II and III hours on my setup.

Half the battle with this sort of thing is having a room to build it up in. I lucked out with an unfinished basement in my case. I suppose the best place to start is the room size and work from there.

There is no exact science for the screen design. Of the 500 or so Nthusim screens out there, every single one of them is different and unique. Mostly it's dictated by the room size and the projectors used. There are however rough guidelines I go by on my personal builds. I would not go taller than 60" on the screen height. I also would not go with a radius tighter that 60". That pushes the limits of what can be done with 2 projectors.

Three projectors either forces a wider radius or a shorter screen height because of just how much a 16:9 projector is able to cover x 3. You actually get a taller projection with two projectors but three projectors are a more universally accepted spanning setup -- which makes three projectors a safer bet in design. Keep in mind that two projectors puts your edge blend right in the center of your FOV, while three projectors offsets those blends to each side. Dual projector is better suited for AMD Eyefinity builds. There are advantages and disadvantages to both configurations.

We're still working up content for the Nthusim 4.0 release. We actually have a Wordpress site that compliments the forums, but it's not public yet. Things like user made tutorials, videos and FAQs are things we'd like to add as content here but is also good to be spread around to other sites too. A lot of people learn about Nthusim from external sources like other forums or my YouTube videos.

I realize that didn't 100% cover everything but a lot about this sort of thing is more art than science. Every screen is unique and designed to the user's needs. Everyone is here to help though, so we're all available for questions anytime. :)

-Brad
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Postby Guest » Thu Sep 18, 2014 9:35 pm

First thanks a lot both for your answers ! I will try to do my best to answer you, I'm french people so my english is really bad :)

@The_Nephilim

1- I was thinking of BenQ W1080ST which seems to have a good quality/price ratio. Is there a VP with HDMI2 or Displayport for 60Hz 3D ? Budget would be about 2500$

2- I want a 1080P projector, no way for other choice. Short throw seems to be the better choice for this kind of setup.

3- I have 2 290x in crossfire and a 780Ti in my computer, maybe I will go with a 980 tomorrow.

4- No idea with the screen size because I've never seen one in real

@BHawthorne

About side deformation : I had it on BF3/4 and DCS too, planes were stretched on sides and it was really disturbing. I played in 5760*1080. Will I have the same problem with 2 or 3 projectors because it's only due to 16*3=48/9 screen ratio ?

That why I was thinking to 2 projectors design, to have "only" a 32/9 ratio. Why do you say that 3 projectors is more accepted ? for the game it's just one screen, either in 5760*1080 or 3840 ?

Thanks a lot for your help !
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Postby Guest » Thu Sep 18, 2014 11:43 pm

I just started a draft with 2 Benq W1080ST, 1500mm radius screen
Image

no idea if it's the good way to go
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Postby BHawthorne » Fri Sep 19, 2014 4:34 am

dureiken wrote:First thanks a lot both for your answers ! I will try to do my best to answer you, I'm french people so my english is really bad :)

@The_Nephilim

1- I was thinking of BenQ W1080ST which seems to have a good quality/price ratio. Is there a VP with HDMI2 or Displayport for 60Hz 3D ? Budget would be about 2500$

2- I want a 1080P projector, no way for other choice. Short throw seems to be the better choice for this kind of setup.

3- I have 2 290x in crossfire and a 780Ti in my computer, maybe I will go with a 980 tomorrow.

4- No idea with the screen size because I've never seen one in real

@BHawthorne

About side deformation : I had it on BF3/4 and DCS too, planes were stretched on sides and it was really disturbing. I played in 5760*1080. Will I have the same problem with 2 or 3 projectors because it's only due to 16*3=48/9 screen ratio ?

That why I was thinking to 2 projectors design, to have "only" a 32/9 ratio. Why do you say that 3 projectors is more accepted ? for the game it's just one screen, either in 5760*1080 or 3840 ?

Thanks a lot for your help !


1) Right now the BenQ W1080ST or the Optoma GT1080 are the best options I know about that are consumer priced. Short throw and 1080p together is a new thing. 99% of all short throws are 1280x800 or 1024x768. This has always been a problem. Now at least you can go both 1080p and short-throw.

2) Short throw is pretty much a requirement in order to keep the projection large in a short distance. 0.49:1 to 0.8:1 or so is the range of lens throw to look for. You can go outside that range if the layout allows it, but it'll take looking over the design to be sure.

3) 2x 290X should be fine. 2x 780ti should also be fine. From what I've heard the GTX980 isn't going to be that much of a real world bump up in speed. Then again we'll know a bit more after all the hype settles after the Nvidia event the next 24 hours. I'd hold off and wait for independent source information on the GTX980 though before I'd throw out the R9 290X or GTX780ti as a basis for the build.

4) Really depends on what you want to do, the projectors used, how big you can tolerate the pixel size and what size the room is you are working with.

With DCS World be default you will have distortion because you've not gone in and manually scripted in custom cameras. There is a lua file that covers custom camera views. I'll have to dig around for a link but on the ED forums are a few DCS World camera scripting experts.

Triple display is more widely accepted because Nvidia Surround doesn't even handle dual-display spanning. Also when most games were setup for Nvidia Surround or AMD Eyefinity they tend to do the user interface layout for triple display. Multi-display gaming tends to break a lot of things in games -- triple display tends to break things less because it's the de facto standard most gamers use for spanning. That just makes it compatible with more games, that doesn't really mean it's better for projector though.

-Brad
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Postby BHawthorne » Fri Sep 19, 2014 4:37 am

dureiken wrote:I just started a draft with 2 Benq W1080ST, 1500mm radius screen
Image

no idea if it's the good way to go


You account for edge blend and are accounting for the distance to a flat surface sets the minimum distance. Those are two concepts most people don't understand initially, so that is a good start. Be mindful that the center point of the screen radius does not have to be where the projectors are mounted. In fact it can be problematic because you don't want to mount the projectors in a stack and you want to give a bit of space around there for proper air circulation. For example on my 2013 screen I have my projectors projecting across from each side of the screen, not from the center. You could make the radius a bit more shallow or tighter so the projectors could be mounted side-by-side and still have proper ventilation for each. Your current design is pretty much a 120 degree setup. I like this sort of configuration because it can be used for both movies and gaming. You're losing out on maximized peripheral view, but gaining home theater ability.
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Postby Guest » Fri Sep 19, 2014 5:00 am

Thanks for your answer but according to you 2 projectors setup seems to be non usable for games ?

I don't understand this : "You account for edge blend and are accounting for the distance to a flat surface sets the minimum distance. Those are two concepts most people don't understand initially, so that is a good start."
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