![]() ![]() Then you can play around and make sure you have adequate clearance and such for different positions. This becomes much easier if you sketch out a room to scale, including furniture cutouts (with the dimensions in the reclined position and eye position noted). Place the eyes first then the seat is located to accommodate that. If you have chosen your seat (or already own them) you will need to measure where the eyes end up when in the reclined "movie watching position". You are basing these measurements on the location of the viewer's eyes, not the seat itself. ![]() In other words you can work either way: let the screen dictate seating or the seating dictate screen (for acoustic layout the latter is better). ![]() Double that value and you now have your screen width (which is good as projection screens are usually referenced by screen width and aspect ratio) and convert to diagonal measurement if you choose using Pythagorean theorem. You will plug in your desired viewing angle (theta) then solve for the opposite side using tangent. That will define your viewing distance (adjacent side). Locate the seats where you want them or, better yet, where the room's acoustics suggest the best location. If you start running into problems with seating location then wipe the slate clean and don't presuppose a screen size. Couldn't quite make 30 back there but it's close. I tried to achieve a 35/36 degree angle from my first row while maintaining the minimum 30 degree angle in the second row. You can play with these numbers until you're blue in the face. If you're shooting for 35 degrees horizontal field of vision then half of that is 17.5 degrees (remember that we cut the width of the screen in half to create the right triangle). The angle is based on your field of vision. You plug in your desired angle ( theta) and use tangent to solve for the adjacent side (ie. You are solving for the distance from your eyes to the screen - this is the adjacent side. Cut that in half to form the opposite side of a 90 degree triangle. You now have an expected width of screen. You know the hypoteneuse (diagonal) and you know the aspect ratio (16x9) so can go from there. If you are basing your screen size on diagonal measurement you will need to use Pythagorean theorem to solve for the height and width. Well this is it! Time to pull out trigometry and Pythagorean theorem. Remember back in junior high and high school when you scoffed at algebra and geometry, but were warned by your teachers it would come in handy some day. It all comes down to balancing between sitting close enough to achieve the proper scale so an image looks sufficiently big and involving, yet not so close that it's overwhelming, causes eye fatigue, or results in the image structure being visible (ie. There is another specification for vertical location to define a vertical field of vision (I believe this is optimally around 15%). SMPTE indicates the screen should occupy no less than 30 degrees of your field of view, whereas THX endorses 36 degrees. It's a simplified means of defining a recommended field of vision. If I recall from the document referenced above it uses the basic reference point of 1.5 times screen width. ![]() There's a site out there (was sure I had the link but can't find it) that will do the math for you. ![]()
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