[vtkusers] vtkCamera focal point

[peterm]

Hello

Could anyone please clarify something about vtkCamera please? 

As far as I know there is an intrinsic camera parameter referred to as the
focal distance that is the distance between the camera position and the
principal point (that is at the intersection of the image plane and the
camera principal ray (view direction)). Additionally the dimensions of the
considered rectangular region on the plane and the focal distance determine
the field of view.

In vtk there seems to be a way to set the focal distance and the field of
view independently of each other.
The field of view is stored in a variable called viewAngle and the focal
distance is represented as the distance between focalPoint and
cameraPosition. 

If the way it works is that focal distance and the field of view together
define the transformation, than does it work like someone has to compute the
focal distance manually from the window size and the FOV and use the value
as the focal point, camera position distance? 

My question is whether there should be some description available about this
issue, or whether someone could please clarify the case?

Thanks a lot,
Peter

Peter

--
View this message in context: http://vtk.1045678.n5.nabble.com/vtkCamera-focal-point-tp4827457p4827457.html
Sent from the VTK - Users mailing list archive at Nabble.com.