[SML] Rear projection

[Davin Gaddy]

Yes, this is a possibility.  My issue is that not knowing the resolution of the OP's projector, and that they may want to have a relatively large image (for two windows, unknown distance apart), with an unknown lens, digitally altering the image may not be the ideal solution.  Even with actual rear screen material, if the gain is high enough, you can get a hot spot and it will require off axis adjustment.  You do not always need third party software to fix the geometry, depending on the projector, though you may need it to split your image.  You can do this with many different software depending on budget and how you want to run a show. 

> Sent: Saturday, October 24, 2015 at 10:22 PM
> From: "smashwolf at gmail.com" <smashwolf at gmail.com>
> To: "Stagecraft Mailing List" <stagecraft at theatrical.net>
> Cc: "Davin Gaddy" <davin at techie.com>
> Subject: Re: [SML] Rear projection
>
> you can fix hot spots in software!  Use video mapping software, place 
> the projector OFF AXIS, so the hot spot is not visible, and correct the 
> geometry with the mapping software.  I have done this with a product 
> called MadMapper, and a video capture device like a BlackMagic Design 
> Shuttle on a MacBook Pro.  The projection source will be out of view, 
> and you can use one projector then to map multiple different geometric 
> shapes to project through at once.  MadMapper is cheaper , but I have 
> found ArKaos Media Master to be much easier to use if you can afford 
> it.  Media Master is also a PC app instead of OS X.
> 
> -s
> 
> 
> On 10/24/15 10:13 PM, Davin Gaddy via Stagecraft wrote:
> > How do you want the windows to look when no projection is on them?  Are you going to be projecting on it at all times that it is visible?
> >
> > If yes, rear screen material is often best, especially as it can reduce the hot spot from a projector (though there are other considerations).  There are many different alternative projection fabrics that Dazian and Rosebrand have to offer.  Heck, for Halloween, I use a cheap, dollar store grade white plastic table cloth to cover my living room window and rear project on it.
> >
> > If no, then I agree that products like the screen goo material is a great option.
> >
> > Something to consider that if you use one projector to create visuals for the two separate windows, you will be wasting a lot of pixels and drastically reducing the resolution of each image.  Depending on what you want it to look like, this may be really ugly.
> >
> > Davin
> >   
> > "Hi all,
> >   
> > I?m working on setting up some set windows (4 @ 6?x6?) for rear projection and I wanted to know people?s recommendations for fabric/screen material and projectors. I should be able to get a 20? throw and the projection designer is hoping to cover more than one window with one projector.
> >
> > Neither I, nor the projection designer, nor the set designer have used rear projection, but front projection in our venue is going to be such a headache, we?d rather tread into the unknown.
> >   
> > Thanks,
> >   John"
> >
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