Hallo,
I simulate a real camera with OSG camera node and for debugging I have
some problem with the pixel location. I would like to know whether the
following statement is correct or false:
if coordinate of vertex in eye coordinate is (xe,ye,ze), and we assume
that xe>0,ye<0,ze<0, namely, the verice should appear next to bottom
right corner of the image. (Origin of the image is top left, x forwards
to right, y forwards to bottom)
Then can its corresponding pixel location(px, py) on the image
calculated like following? (x resolution of image is xRes, y
Resoluation is yRes, yaw angle of camera is ViewYaw, pitch angle of
camera is ViewPitch, near plane is 1 )
px=xe/abs(ze)* (xRes/2/tan(ViewYaw/2)) +xRes/2
py=abs(ye)/abs(ze)* (yRes/2/tan(ViewPitch/2)) +yRes/2
I get coordinate of vertex in eye coordinate by a product of vertex
global coordinate and camera->getViewmatrix(), and then calculate the
corresponding pixel location following the above formulas. But the
location is not correct compared to what appears on the image. the error
is about 50 pixels in the x coordinate.
Can anybody give me some tips on that?
Thank you very much in advance!
Best regards
Shuiying
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