Projecting onto a curved wall

olialonso

dbini

https://vimeo.com/29877867

This may help

dbini

thank you @olialonso.

Maximortal

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

fubbi

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.

jhoepffner

@ dbini

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

mark_m

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

jhoepffner

yes, as in photography but:

1) I dont know any beamer with variable aperture

2) you loose luminosity (half by aperture step)

dbini

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

LPmode

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.

dbini

Thanks @LPmode - great info

- the double colour installation is lovely! -