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Author
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Topic: Strip screen Alignment Plate/Guide
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Steve Kraus
Film God
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Posts: 4094
From: Chicago, IL, USA
Registered: May 2000
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posted 02-10-2003 05:28 PM
Mark wrote: Having the parts made via a punch press is not a problem. There could be an angle refrence stappmed into each plate at each guides location to enable proper alignment of each strip at top, center, and bottom.
Perhaps, as long as each set of top, bottom, and center plates is custom made with the proper angles for each strip. In the middle the strips are following the curve of the screen but as you move to either side they start to deviate more and more from the curve.
John: I thought about the ray tracing idea to determine the best angle, too. But what ray are we tracing. From projector, off the strip and back to the center of the audience? But that would be useful only with some sort of gain material where maximum reflectance is angle of incidence = angle of reflection. If that were the right way then you'd be angling the 3 sections illuminated by different projectors differently. No, that's not right. We know it didn't work that way and indeed that method would not minimize cross reflection.
I think I'd start with the idea that the strips are held flat across the stage...the same angle a totally flat screen would be. That would have zero cross reflection but a lot of light is wasted hitting the back of the neighbor strip that is further out. It also wouldn't look right from many seats. From there I'd move on to the idea that each strip is perpendicular to a point in the center of the audience. I think that would give the best illumination and minimal cross reflection.
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