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I have access to an Epson W39 projector for use in my AR Sandbox, but it is not a short-throw projector. Is it possible to mount a non-short-throw projector high enough to fill the box area and not end up creating a shadow from the 3D camera that necessarily has to be mounted lower than the projector?
Who’s done it and how did you do do it?
Thanks!
-Farren
Before I sourced a short throw, I shot a std throw up into a mirror which reflected down on the box. Camera was mounted at mirror level.
Well, I just found out we have a “seldom used” ultra-short-throw projector that I might be able to borrow. It’s on an old Promethean smart-board. A UST-P1.
https://www.projectorcentral.com/Promethean-UST-P1.htm
Would it be easier or harder to make that work vs. a standard-throw Epson W39?
-Farren
Ultras might cause issues with the camera but depending on how the difference between the image and the base of the projector, you might be able to get away with it. Try holding it so it fills the box, then have another person hold the camera while virui is running to see if there is any shadow issues.
I think the Promethean has too short of a throw. As I read the specs, it will not focus beyond a 24 inch throw distance. It’s common to have around a 40 inch throw distance on a sandbox. Focus is not generally vital with the projected sandbox content (except for calibration), but this may be too far out.
Hi Farren, I have build 2 sandboxs with a epson powerlite s41+ and a epson powerlite s31+ both are not short-throw projector, they are about 140-150 cm/ 55 inch above the sand. Also, I just put the kinect at that same height, so it’s not really necessary to put it lower than the projector, you lose a little resolution, but people can’t really tell the differences they will still be amazed from the sandbox.
So I can’t help you with the shadow problem if you put it lower, but i will try in some weeks with a new one to see what happens.
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