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Author Topic: math help for setting up camera angles  (Read 1824 times)

flipper

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math help for setting up camera angles
« on: May 11, 2011, 12:54:59 am »

I have some questions about setting up a camera angel for an isometric view.
http://en.wikipedia.org/wiki/Isometric_projection#Overview
This view differs slightly form the built in ortho view. and once I get the camera settings I will be able to rotate the camera to different perspectives (easier than rotaing the scene and the light) I do have to match things that are existing.

So what I have: object h High
Camera tilted down 55 degrees
camera set at 100(x-axis) z(z) 100 (y-axis)
FOV set to 45 degrees

does anyone know of a good way (mathematically) of determining the height of the camera?

with the camera set at 100(x) 100(y) the camera is set as a distance of 141 away. a^2+b^2=c^2

Tan(90-55) =h/141
h=67 high but that doesn't work unless I want his feet. what am I missing????
I realize I need to compensate for the height, but not sure how to do that






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Water Music

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Re: math help for setting up camera angles
« Reply #1 on: May 11, 2011, 01:16:01 am »

Mathematically, you need to add the height difference between the feet and the point on which you would like to focus to h.

Non-mathematically, if you want the camera at a specific x,z, and angle but are not specific about the height then just temporarily alter the FOV such that the frame-lines are as tight as possible (ie 1) and move the camera along the y-axis until it is pointing at what you would like to be the centre of your shot.  Then change your FOV back.

Hope this helps :)
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