Widescreen Gaming Forum :: View topic - Multi-Projector Build 2.0

What I want to know is how you got the two images to line up so perfectly on the centre line?! :clap:

I've always been of the mindset that the viewing location is dependant upon content. I find that I'm mostly gaming from 8 foot. If I watch tv I'll pull the chair back to 10-12 foot. On simulation games I line up at the 5 foot centerpoint.

Yep, I can get three GT720 factory refurbs for the cost of a single BenQ W1080ST, so it's really a tough decision. Heck, I could have 3x2 Eyefinity GT720 for the cost of the 2x1 W1080ST. At issue is the manufacturing engineer in me doesn't like the idea of adding in unnecessary complexity into the configuration. IMHO 2 > 6. In an ideal world some manufacturer would come up with a DisplayPort 1.2 3500 lumens UHD 0.61:1 short throw LED projector for $999. Get two of those and call it good. I can always dream I guess. :lol:

What camera do you use for pictures of the screen?

Helping Univisual snap low light photos is outside of the scope of publicly assisting the forum community with screen design and projector help.

Interesting projector. I never knew anyone made short throw LEDs with 700 lumens. That's pretty bright for a LED based light source. Looking at the diamond pixel configuration it looks problematic with fonts and antialiasing. I've always been weary of projectors under 2500 lumens. I just wish LED projectors went that bright. UHP based bulb systems are annoying to me for several reasons. They're a consumable that needs changed every 2 years and the thermals make portrait mode impossible for most.

I have a tripod adapter coming early next week, so I can start taking video. I guess I lost the quick release plate for my tripod awhile back. :doh:

but the FoV is not much bigger than on a normal (2x1)Monitor right?

Could you make a Video where you move around? With a whole setup and close look for picture quality ?

Author:	chieftex [ 18 Jun 2013, 12:49 ]
Post subject:	Re: Multi-Projector Build 2.0
I'm blown away by how cool this looks! While I'm with you on the price discussion, don't forget that 2x1 (benqs) will have a lower system requirement than 3x2 (optomas), with regards to resolution of course. What I want to know is how you got the two images to line up so perfectly on the centre line?!

Author:	BHawthorne [ 18 Jun 2013, 20:00 ]
Post subject:	Re: Multi-Projector Build 2.0
chieftex wrote: What I want to know is how you got the two images to line up so perfectly on the centre line?! Pre-warping software does two main things -- #1 set up a grid of control points into a mesh that can be edited so the projection can fit the physical geometry of the screen, #2 set up a linear alpha blend at the edge of each projection to make a seamless edge blend. In this case the blend is a 15% overlap on the centerline of the screen. I also do a trick that gets rid of the hard break at #000000 black. I'm in the process of writing up a few FAQs that detail some unique things I do different than other people when it comes to setup and configuration. Tips and tricks I've learned over the course of my builds that improve the overall look and make things easier to do. While there are always multiple ways to do things, some are better than others and some take less work to do right. Some of the tricks are specific to Nthusim, but most are generic tricks anyone can use.

Author:	BHawthorne [ 19 Jun 2013, 18:55 ]
Post subject:	Re: Multi-Projector Build 2.0
A few more pics I took today. Attachment: arma3_06192013.jpg [ 580.39 KiB \| Viewed 4090 times ] Attachment: borderlands2_06192013.jpg [ 641.8 KiB \| Viewed 4097 times ] Attachment: marswarlogs_06192013.jpg [ 646.92 KiB \| Viewed 4087 times ] Attachment: planetside2_06192013.jpg [ 544.33 KiB \| Viewed 4098 times ] Attachment: saintsrowthethird_06192013.jpg [ 695.32 KiB \| Viewed 4111 times ] Attachment: torchlight_06192013.jpg [ 688.74 KiB \| Viewed 4094 times ] Attachment: eveonline_06192013.jpg [ 558.8 KiB \| Viewed 4100 times ] Attachment: neverwinternights2_06192013.jpg [ 633.29 KiB \| Viewed 4099 times ] Attachment: rift_06192013.jpg [ 692 KiB \| Viewed 4174 times ] Attachment: torchlight2_06192013.jpg [ 605.85 KiB \| Viewed 4099 times ]

Author:	marius@warpalizer [ 20 Jun 2013, 08:14 ]
Post subject:	Re: Multi-Projector Build 2.0
BHawthorne wrote: I've always been of the mindset that the viewing location is dependant upon content. I find that I'm mostly gaming from 8 foot. If I watch tv I'll pull the chair back to 10-12 foot. On simulation games I line up at the 5 foot centerpoint. Yep, I can get three GT720 factory refurbs for the cost of a single BenQ W1080ST, so it's really a tough decision. Heck, I could have 3x2 Eyefinity GT720 for the cost of the 2x1 W1080ST. At issue is the manufacturing engineer in me doesn't like the idea of adding in unnecessary complexity into the configuration. IMHO 2 > 6. In an ideal world some manufacturer would come up with a DisplayPort 1.2 3500 lumens UHD 0.61:1 short throw LED projector for $999. Get two of those and call it good. I can always dream I guess. I use Asus B1M right now, they are 700 lumens and short throw LED. There is some strange things about these, they use a technology called "TI DLP Diamond Pixel", causing every pixel to be rotated 45 degrees. It's the same with my Vivitek QUMI Q5. Makes straight lines look like shit in for example Excel. Diamond pixel: http://www.kguttag.com/2012/02/09/ti-dlp-diamond-pixel/ Asus B1M: http://www.projectorshop24.co.uk/asus-p ... /asus-b1m/ What camera do you use for pictures of the screen?

Author:	BHawthorne [ 20 Jun 2013, 09:14 ]
Post subject:	Re: Multi-Projector Build 2.0
marius@warpalizer wrote: What camera do you use for pictures of the screen? Helping Univisual snap low light photos is outside of the scope of publicly assisting the forum community with screen design and projector help. Interesting projector. I never knew anyone made short throw LEDs with 700 lumens. That's pretty bright for a LED based light source. Looking at the diamond pixel configuration it looks problematic with fonts and antialiasing. I've always been weary of projectors under 2500 lumens. I just wish LED projectors went that bright. UHP based bulb systems are annoying to me for several reasons. They're a consumable that needs changed every 2 years and the thermals make portrait mode impossible for most. I have a tripod adapter coming early next week, so I can start taking video. I guess I lost the quick release plate for my tripod awhile back.

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Author:	marius@warpalizer [ 20 Jun 2013, 11:21 ]
Post subject:	Re: Multi-Projector Build 2.0
BHawthorne wrote: Helping Univisual snap low light photos is outside of the scope of publicly assisting the forum community with screen design and projector help. Interesting projector. I never knew anyone made short throw LEDs with 700 lumens. That's pretty bright for a LED based light source. Looking at the diamond pixel configuration it looks problematic with fonts and antialiasing. I've always been weary of projectors under 2500 lumens. I just wish LED projectors went that bright. UHP based bulb systems are annoying to me for several reasons. They're a consumable that needs changed every 2 years and the thermals make portrait mode impossible for most. I have a tripod adapter coming early next week, so I can start taking video. I guess I lost the quick release plate for my tripod awhile back. Hehehe, Okey. Yeah, it is really bright! Alot better focus depth than the Qumi Q5 also. Fonts, straight lines is not god. But gaming and movies looks really good.

Author:	Haldi [ 20 Jun 2013, 17:09 ]
Post subject:	Re: Multi-Projector Build 2.0
Damn.... that looks so neat. Makes me want one! At least when Star Citizen releases! but the FoV is not much bigger than on a normal (2x1)Monitor right? Could you make a Video where you move around? With a whole setup and close look for picture quality ?

Author:	BHawthorne [ 20 Jun 2013, 21:11 ]
Post subject:	Re: Multi-Projector Build 2.0
Haldi wrote: but the FoV is not much bigger than on a normal (2x1)Monitor right? Could you make a Video where you move around? With a whole setup and close look for picture quality ? It's all relative to the curvature of the screen and the overall aspect ratio and where you sit in relation to the screen. In this case is a 180 degree 5 foot radius at 58" projection height. You just set the FOV manually in game prefs much like we all do with Eyefinity and Surround games with LCDs. I sit at about 8 foot back and set for 120 degree FOV instead of sitting on the centerpoint of the radius and setting 180. But it really depends upon the game and how I want to view it. Once I have my new quick release plate for my tripod I can do video.

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