I’ve you to thank for studying this vital reality right here on the boards. As soon as I received that, that set me on the trail to determine the remainder.
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What you may depend on is that this: If you happen to sort in an angle for the vertical angle of view, you get precisely what you requested, no downside. For instance, in the event you sort 37.8° with the Zoom instrument, you get the view of a 35mm lens. You’ll be able to resize the window and the vertical a part of the picture holds whereas the horizontal half floats displaying you both extra or (within the case of the iPad) much less of the horizontal area of view relying on the proportions of the window (iPads are typically 4:3 so it’s reduce off).
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If you happen to sort in a focal size, like 35mm, what SketchUp does is convert that to an angle of view after which enters that for you for the worth. The bug is that this: in the event you sort 35mm, what SU comes up with is 54.4° which is the proper worth for the horizontal angle of view, however that’s not what SU really makes use of; it makes use of the vertical one. Consequently, what SU stories for a focal size on horizontal photographs is at all times off by an element of 1.5x as a result of the side ratio of 35mm photos is 3:2. The exception is a vertical picture as a result of the broader “horizontal” angle of view coincides with SU’s vertical angle of view.
Through the celebration at 3D Basecamp, I caught @thomthom’s ear, and he appeared to concentrate on this already. He identified in the event you use his Secure Frames plugin, then it’s going to report the proper focal size.
Right here for reference is my 3D Basecamp handout:
SketchUp AoV Ref Desk v1,0.pdf (500 KB)
I hold a printout of this desk on my desk for reference on a regular basis.
