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Bug in ViewScene example: fieldOfViewY is calculated incorrectly

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discoguy77

discoguy77
Posted: 24 March 2011 02:19 PM

Total Posts: 2
Joined: 24 March 2011 08:48 PM

Hello,

There is a bug in SetCamera.cxx which causes cameras to display incorrectly. The problem lies in the SetCamera() function, where it is determining the lFieldOfViewY. Here is a code snippet of the problem area (I’m using FBX SDK 2011):

} else if (lCamera->GetApertureMode() == KFbxCamera::eFOCAL_LENGTH) {

            lFieldOfViewY = lCamera->ComputeFieldOfView(lCamera->FocalLength.Get());

            lFieldOfViewY /= lAspect;

        }

This is simply wrong: you can’t just divide the horizontal angle by the aspect ratio in order to get the vertical angle. Here is the corrected code:

} else if (lCamera->GetApertureMode() == KFbxCamera::eFOCAL_LENGTH) {

            double halfApertureYinMM = lCamera->GetApertureHeight() * 25.4 / 2;

            double halfAngleInRad = atan(halfApertureYinMM / lCamera->FocalLength.Get());

            lFieldOfViewY = 2*MathUtil::rad2deg(halfAngleInRad);

        }

I expect the same problem exists a few lines further up, in the same function:

if (lCamera->GetApertureMode() == KFbxCamera::eHORIZONTAL)

                    lFieldOfViewY /= lAspect;

and would be fixed the same way.

Cheers,
Russ MacKenzie

Replies: 1

Hello Russ,
I checked the newest code and saw this part is already changed.
Please check it in our next release.
Thanks a lot for reporting!

Author: Jiayang Xu

Replied: 24 March 2011 11:53 PM

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