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    Projection onto glass building: thoughts and suggestions please

    How To... ?
    projection mapping architecture izzymap
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    • Paz
      Paz Beta Tester last edited by Woland

      Hello Isadora community, I'm looking for guidance. I'm involved in a project to illuminate a large building with video content. The building is primarily glass fronted.

      My question is if we project imagery onto glass will it be visible? We have no experience of this so I'm looking to this community for their own experiences. Please can you advise me on whether we need to treat the glass with a film to ensure the content is vivid, do we project from the front as if we were projecting on to a surface on a stage or do we rear-project onto the glass? We've got budget for several projectors in the 20,000 lumen range. 

      Thank you for your time and help.

      Paz

      Simon Powell: Researching Emerging Technologies in Live Performance at University of the Arts London.
      Running: Mac Studio M1 Max 32GB, 512GB SSD, macOS 15.1 | MacBook Pro M2 Pro 16GB, 512GB SSD, macOS 15.1 / Izzy v4.09 /// UK

      dbini 1 Reply Last reply Reply Quote 0
      • dbini
        dbini @Paz last edited by

        glass will reflect some, and be invisible to most of the projected light unless treated. it may be better to back-project onto some kind of screen material that is stretched across the window, depending on what kind of space you have behind the windows.

        John Collingswood
        taikabox.com
        2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
        plus an old iMac and assorted Mac Minis for installations

        1 Reply Last reply Reply Quote 0
        • fubbi
          fubbi last edited by

          If you are doing a frontal projection with a 20k (in the dark) and the building is dirty/dusty enough you might get a decent image, there is no way around making a test though. 

          I would also try doubling 20ks if you need more punch.


          Ps. Make sure they don't clean the windows between now and your show

          Mac M2 Ultra, 64gb — Berlin

          1 Reply Last reply Reply Quote 1
          • Paz
            Paz Beta Tester last edited by

            @dbini @fubbi Thanks both for your input. The building in question is still being constructed and so the glass is most likely very dirty at the moment but come the event windows may have been cleaned, that's out of my control. Maybe I will look at rear projection the rooms are large and projectors can be set well back. Would anyone have suggestions or could they share their experiences of using a film to cover the glass and where I may purchase such material. One question I have is can can the film be removed easily, does it leave any marks? Thanks again!

            Simon Powell: Researching Emerging Technologies in Live Performance at University of the Arts London.
            Running: Mac Studio M1 Max 32GB, 512GB SSD, macOS 15.1 | MacBook Pro M2 Pro 16GB, 512GB SSD, macOS 15.1 / Izzy v4.09 /// UK

            D 2 Replies Last reply Reply Quote 0
            • dbini
              dbini last edited by

              Screen material choice will depend on how large your windows are and how far away your audience is. 

              I've used various things in windows to back project onto. Rosco RP screen is awesome, but very expensive. there are various films that you can apply directly to the window but these will need to fit exactly, otherwise you get bright lines appearing on the edges. If your window is higher than the audience and you project from the floor of the room then you don't get that nasty back-projection hotspot issue, so you can get away with using cheaper screen materials - I tend to use basic cotton sheeting stretched on frames and clamped to the window frames, but then I always seem to be working to a tight budget. I built an RP screen using a lightweight rubbery material - I think it was the kind of stuff that hospitals use to protect mattresses. That worked really well. 

              I discovered two issues last year when projecting onto window screens in different rooms - I had 6 projectors over 2 floors - that the projectors need to be the same, with similar lamp life, and with a bit of luck they will output something similar. And that you need a solid solution for mapping. from inside the building I couldn't see the whole image so I needed somebody outside on the phone to guide me with tweaking the map, even though I had designed the content to be as simple as possible and to compensate for the difficulties of the building.

              Fubbi's idea of blasting as many lumens as you can find onto dirty glass is a good solution if you have the right place to project from. 

              John Collingswood
              taikabox.com
              2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
              plus an old iMac and assorted Mac Minis for installations

              1 Reply Last reply Reply Quote 1
              • D
                DillTheKraut @Paz last edited by DillTheKraut

                @paz

                I often used buttermilk to paint windows with it. It really works very well with a little practice. Just paint it like a wall with a painting roll. But the one with foam.

                The result depends a bit on the rolls and the thickness of the buttermilk. You can try to mix it down with water a bit.


                Realy, I'm not joking! And no, it won't smell as it dries very fast! Easy to remove with water. Very cheap, but very nice result like frosted glass (Actualy in German it is called Milchglass = milk glass ;-) ).

                Best projecting result would be to project to the painted site of the glass, but depending on the glasses thickness, it might work from the other site.


                best
                Dill

                1 Reply Last reply Reply Quote 3
                • D
                  DillTheKraut @Paz last edited by DillTheKraut

                  @paz


                  here is an example where we worked with the buttermilk.

                  Watch the video, and pay attention to the upper parts of the windows, where the text is projected on. It is the exact same glass, that was used for the lower main window!


                  https://www.ruhrtriennale.de/d...
                  There are some pictures in between the text as well.

                  1 Reply Last reply Reply Quote 3
                  • fubbi
                    fubbi last edited by

                    @DillTheKraut I use buttermilch too. Its 100% a good idea, but it should be mentioned that there is a small stink phase involved as it dries and dies.


                    If you want to spend money there are films from Gerriets, 3M and even on amazon these days: https://www.amazon.com/s?k=Rear+ADHESIVE+Window+Film+PROJECTION+SCREEN+MATERIAL&ref=nb_sb_noss

                    Mac M2 Ultra, 64gb — Berlin

                    D 1 Reply Last reply Reply Quote 1
                    • Paz
                      Paz Beta Tester last edited by

                      Hey thank you so much @dbini @DillTheKraut @fubbi for your thoughts and ideas. I have time to experiment as the event is not until October. I will let you know how I get on!


                      Thanks once again and best wishes, Paz

                      Simon Powell: Researching Emerging Technologies in Live Performance at University of the Arts London.
                      Running: Mac Studio M1 Max 32GB, 512GB SSD, macOS 15.1 | MacBook Pro M2 Pro 16GB, 512GB SSD, macOS 15.1 / Izzy v4.09 /// UK

                      1 Reply Last reply Reply Quote 0
                      • D
                        DillTheKraut @fubbi last edited by

                        @fubbi

                        Hmm, strange. Never had that smelling, beside the natural buttermilk smell. Maybe it's the branch, wich one are you using? 😄

                        1 Reply Last reply Reply Quote 0
                        • dbini
                          dbini last edited by

                          .. there's also a product that is used for painting onto glasshouses when it gets too hot for the plants inside. Its called shade compound or Coolglass. Its a white solution that you dilute with water before applying. It definitely doesn't smell and washes off easily. it might be worth experimenting with that and a roller...

                          John Collingswood
                          taikabox.com
                          2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
                          plus an old iMac and assorted Mac Minis for installations

                          1 Reply Last reply Reply Quote 1
                          • I
                            ian Beta Platinum last edited by

                            sounds like great project and agreeing with all the suggestions

                            A few other thoughts: ** experiment a LOT with the refraction / reflection angles. Probably some of my favorite work has been complex reflections off the glass onto the other surfaces from really unusual angles.

                            * Two other unusual films that I've had interesting results with : polifilm (various brand names) - https://www.polifilm.com/ makes the blue or green or clear film that's often on new windows; and the other cheaper alternative are various brands of tinted pallet wrap https://www.uline.com/Cls_03/S... 

                            * and - I've found that the tinted IR /UV coatings on many new commercial windows (at least in California) are just enough tint to let a ghost image condense.

                            * and finally - a uniform mist on glass makes a fabulous ghost projection surface...

                            Ian Winters
                            2022 M1Max 64gb osx 13.x, 2020 ImacPro 12 core 32gb 13.x, 2018, Retina MBP 2.9ghz i7 / 16gb / Radeon Pro 560x 4gb / 13.x /
                            video and media design / ianwinters.com

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                            • Paz
                              Paz Beta Tester last edited by

                              Just quickly wanted to add a big thanks to @Ian and @dbini for the additional ideas and product info!

                              Simon Powell: Researching Emerging Technologies in Live Performance at University of the Arts London.
                              Running: Mac Studio M1 Max 32GB, 512GB SSD, macOS 15.1 | MacBook Pro M2 Pro 16GB, 512GB SSD, macOS 15.1 / Izzy v4.09 /// UK

                              1 Reply Last reply Reply Quote 1
                              • barneybroomer
                                barneybroomer Beta Gold last edited by

                                That buttermilk suggestion could saved me a lot of money..... Thanks for the tip! I will try in the future.

                                Mac Mini M1 2020 / OSX 11.7
                                MacBook Pro 2,3 Ghz Intel 8 core I9 / OSX 10.15.7
                                MacBook Pro 2,2 Ghz Intel 8 core I7 / OSX 10.15.7

                                and a Motorola DynaTAC 8000X ;)

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