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  • Creating a projection for an actual sphere

  • Graham Quince

    February 12, 2007 at 9:15 am

    Well hemisphere actually. I’ve been asked to look into creating a large display using a white half-globe and an LCD projector.

    I’m yet to get my hands on the equipment, so I’m in the dark as to how to go about creating video for this.

    I’m thinking that wrapping any video around an AE CC Sphere would give me the correctly distorted projection. Or would it?

    Has anyone got any advice or experience creating this type of thing?

    Graham – web design
    ——– – Free FX for amateur films

  • Nate Vander Plas

    February 12, 2007 at 5:29 pm

    No, I don’t think it will be that simple. If you wrap your video into a sphere it will stretch it all the way to the back side which won’t be seen from the front. I’d try a bulge or bezier warp. But the thing is, do you need your video to bulge if the screen is already bulging? Maybe what you need is just a circular mask.

  • ameister

    February 13, 2007 at 1:03 am

    Is it possible for you to hook up your laptop to the equipment and create the projection in situ? That way you can counter-warp by eye.

  • Nate Vander Plas

    February 13, 2007 at 3:45 am

    Yeah, I would think that, if anything, you would want to warp the footage the opposite way that the screen is warping it. But the way I’m picturing it, there will always be an angle from which the video is stretched funny. I’m not sure if there is a perfect solution here.

  • ameister

    February 13, 2007 at 4:06 am

    you could then maybe set up two projectors at 45 and -45 degrees to minimise effects of light and information loss. Lighting designers for the theatre know about anamorphic projection.
    you could try and ask these people:

  • MajorAsshole

    February 13, 2007 at 10:10 am

    get ahold of the equipment
    project a grid pattern. Distort grid pattern until it is nice and straight on the hemisphere. Then run all your stuff through that comp to distort it the exact same way.

  • Graham Quince

    February 13, 2007 at 9:35 pm

    Thanks for all your advice guys. I think I will have to wait until I get the equipment and the grid idea is a great one.

    Graham – web design
    ——– – Free FX for amateur films

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