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    Projecting onto a curved wall

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    • dbini
      dbini last edited by

      Hello everyone,

      I've been asked about the potential for creating some responsive visuals for an exhibition. the space they are offering has a large curved wall, 10m wide, 2.5m high. Does anybody have any ideas of the best way to cover this wall with projection(s)?
      Projectors are designed to send a flat image onto a flat surface, so what are the implications of projecting onto a concave surface? and can IzzyMap solve these problems?
      Please see the attached plan of the room. I have been told that there are rigging points in the ceiling. I think the space at the top of the image is a service walkway, although I don't know how high this is overhead - it may be a very useful place to set up projectors and control.
      Thanks,
      John

      b698f9-curved-wall.jpg

      John Collingswood
      taikabox.com
      2013 MBPR 2.3GHZ i7 OSX11.7.4 16GB
      & 2019 MBPT 2.6GHZ i7 OSX12.3 16GB

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      • jhoepffner
        jhoepffner last edited by

        @dbini

        I had this problem and I found a way to do it but not so easy. I would write a manual, but I lack time.
        The way to do it:
        – make a 3D model of the place in cinema 4D, with a uv texture on the projection wall
        – import the model in Unity 3D
        – use syphon to send a movie from Isadora to the uv texture in Unity (there is a syphon package)
        – place a camera at the beamer place in Unity (there is a shift package)
        – send the camera view with syphon
        – use the image in Isadora
        If the distances, curves and angles are accurate, you have a very good and precise projection.
        You can even change the parameter using OSC or Midi.
        If you come in Paris, I can make a demo, or I can make the job with a travel ticket… :-)
        Jacques

        Jacques Hoepffner http://hoepffner.info
        GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
        MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
        MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
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        • dbini
          dbini last edited by

          Thank you Jacques. so its complicated. looks too complicated for me...

          John Collingswood
          taikabox.com
          2013 MBPR 2.3GHZ i7 OSX11.7.4 16GB
          & 2019 MBPT 2.6GHZ i7 OSX12.3 16GB

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          • O
            olialonso last edited by

            dbini

            https://vimeo.com/29877867

            This may help
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            • dbini
              dbini last edited by

              thank you @olialonso.

              John Collingswood
              taikabox.com
              2013 MBPR 2.3GHZ i7 OSX11.7.4 16GB
              & 2019 MBPT 2.6GHZ i7 OSX12.3 16GB

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              • Maximortal
                Maximortal last edited by

                add this feature of mapio in isadora wish list for Mark  ;-)

                Iro Suraci | Win 10 - Ryzen 3600 - 32GB - nVidia gtx 960 4gb / Win 10 - i5 4210U - 8 GB - R5 M230 | Isadora 3.0.7| Located in Brescia, Italy

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                • fubbi
                  fubbi last edited by

                  There is always just one focus plane though. You cant force a projector to be sharp at different depths. But your wall is so big I say just map it. The curvature is not that extreme.

                  At the end of the day, the nature of your content is important. Mathematically correct geometry is tricky, if its anything like abstract then you can get away with a lot.
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                  • jhoepffner
                    jhoepffner last edited by

                    @ dbini

                    You can also use mapping with bezier curve, as fubbi said, it can be sufficient. Depend of the images

                    Jacques Hoepffner http://hoepffner.info
                    GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
                    MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
                    MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
                    MSI GS65 i7 3.6 Ghz 32 Go / GTX 1070 8 Go / Windows 10 / Izzy 3.0.3b2

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                    • mark_m
                      mark_m last edited by

                      Am I correct in thinking that you can deepen the focal plane with a projector lens that has variable aperture?

                      Intel NUC8i7HVK Hades Canyon VR Gaming NUC, i7-8809G w/ Radeon RX Vega M GH 4GB Graphics, 32GB RAM, 2 x NVMe SSD
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                      • jhoepffner
                        jhoepffner last edited by

                        yes, as in photography but:

                        1) I dont know any beamer with variable aperture
                        2) you loose luminosity (half by aperture step)

                        Jacques Hoepffner http://hoepffner.info
                        GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
                        MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
                        MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
                        MSI GS65 i7 3.6 Ghz 32 Go / GTX 1070 8 Go / Windows 10 / Izzy 3.0.3b2

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                        • dbini
                          dbini last edited by

                          this is all really useful, thanks people.

                          I tend to agree with Fubbi that there's no point making perfect mapping if the content is weak. I think i'd rather fill the wall with abstraction and movement, rather than create a perfectly clear image on a section of it. The museum seem to be more interested in the concept of interactivity, rather than pristine imagery. I think IzzyMap will be flexible enough to trim the source to fit the wall. A superwide lens will help to keep edges in focus. I think the best option is to do an after-hours site visit with a couple of beamers and play around with positioning.
                          John

                          John Collingswood
                          taikabox.com
                          2013 MBPR 2.3GHZ i7 OSX11.7.4 16GB
                          & 2019 MBPT 2.6GHZ i7 OSX12.3 16GB

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                          • LPmode
                            LPmode Beta Silver last edited by

                            I have several curved walls projections. I can say that it is a bit tricky using short-throw projectors and that it should be easier to use long lenses. I use a grid and instead of bezier curves and I incrementally increase the divisions in the grid options as I adjust the points. There is a bug in the grid field when entering double digits so I usual paste the number in rather than typing.

                            here are some installation with two projector 0.6 lenses converging 100% on a curved wall. the projectors themselves are offset about 5 feet apart with the image inverted to create a double shadow /color revealing effect
                            https://goo.gl/photos/jNio7dJtuZjP2q7S8
                            here is another similar installation with blended projectors. you can see the red lines marks for the actual edge of the frame, as well as the unblended areas
                            https://goo.gl/photos/B4G17i1nyXby7wNm6
                            most installations I have done are interactive and use isadora and izzymap. they can get tedious at times and that some things can never be perfect.

                            M1 Max 32GB + ThinkPad P72 64GB Quadro P5200 W10. liviu.stoptime.live

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                            • dbini
                              dbini last edited by

                              Thanks @LPmode - great info

                               - the double colour installation is lovely! -

                              John Collingswood
                              taikabox.com
                              2013 MBPR 2.3GHZ i7 OSX11.7.4 16GB
                              & 2019 MBPT 2.6GHZ i7 OSX12.3 16GB

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