[vtkusers] Camera manipulation

[安 继业]

Hi.

After the picking problem, I tunrs to camera manipulation.

My purpose is to keep the camera lies in front of the screen, just like it 
is holding by the user. And I will let the camera to do a parallel 
projection always. So when user want to pick one point at the cursor 
position, a ray that runs perpendicular with the rendering window will be 
intersected with each actors.

How can I achieve this? When user interact with the rendering process by 
vtkRenderWindowInteractor through mouse, either the position of the camera 
or the actor will be changed.

Any suggestion will be appreciated. Thank you in advance.

Best Regards,
Jiye An

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