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Why can't fieldofView be below 0.02 radians (1.15 degrees)
According to the X3d specs, Viewpoint-> fieldofView can be from 0 to pi. However if I try to set it to any value below 0.02 radians (1.15 degrees), my world dissappears. I would like to be able to use values as small as 0.0017 radians (0.1 degrees). Is there something I can do to my model to resolve this problem or does the player not support this aspect of the X3d specs?
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Inappropriate?Hey;
The spec says that the FOV must be "larger than zero".
Therefore, Vivaty Studio will prevent you from setting a value that is too close to zero. One degree is about where it sets the limit.
Do you really need a FiewOfView smaller than 1 degree? Thats a pretty high powered lens!1 Comment
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I have a 3d model of an object and it is my intention to allow the user to specify the distance and the field of view to view the model. I do need to be able to set the field of view to as low as 0.1 degrees. Yes, it is high powered. I am also using a proximity sensor to show the user the distance they are from the model. Any suggestions on how I could get a 0.1 degree field of view? -
Inappropriate?hi fxsknr, keith wanted me to post because he's having computer problems at the moment. It seems like you are trying to use the camera almost like a telescope. this is just a fieldofview we don't support... as most people are fine w/ larger fieldofviews and it seems most consumer-focused stuff would be larger than .1. are you working on something that's educational/medical? just wondering to put this in context.
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It is educational. It will be used as a training tool for pilots. This will allow them to view scenes at a specified altitude and a field of view narrow enough to see details on areas of interest. Is there a way to simulate the condition by using a larger field of view and a closer distance? I would need to know how to map say 1000ft at 0.1 degrees to a distance at 2 degrees to achieve a corresponding view. Any thoughts?
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Inappropriate?Hi:
Sure, the govering equation looks like this:
tan( fov/2) = w / 2d
where "w" is the width ( or height ) of the viewable area.
"d" is the distance from that area.
I hope this helps work around this problem -
Inappropriate?Most useful models of our solar system need FOV smaller than 1 degree. For example, observing other planets from Earth.
Having a smaller FOV is also useful to demonstrate orthogonal views v/s perspective views. I discovered this FOV limitation only when changing over from a popular but stubbornly non-x3d compliant browser recently and finding many of my viewpoints were broken.
Is there any technical reason why the FOV in Vivaty has been limited? A float has got a lot of decimal places ...
