[vtkusers] Flipping the image with vtkCamera::Yaw() makes image disappear

[Thomas Lambertz]

Hi Jesús,

are you sure you have to use yaw ? In an aircraft yaw means that if you 
fly from east to west after yaw(180) you fly from west to east. So in 
your case you can not see the image because it is behind your camera.

What about mirroring your camera-position on the other side of your 
image ? This would give you a change in left/right (if this is your 
intention).

When you roll(180) then you got a left/right AND upside/down flip.

Hth,
Tom

Jesús Spí­nola wrote:
> Hello,
>
> I'm manipulating the camera of vtkImageViewer2 to flip my image. One 
> of the things I want to do is rotate the camera to see the image 
> flipped. For this I used the method Yaw(180).
> After applying the Yaw(180) the image disappears. If I apply Yaw(180) 
> again, the image appears again in the original orientation.
>
> If after Yaw(180) I reset the camera with vtkRenderer::ResetCamera() 
> the image gets flipped as I want, but I get other unpleasant effects, 
> because of the reset, because the camera is positioned on the center, 
> and I want to keep other transformations that I did before the flip, 
> like rotations, pan, etc
>
> Could someone tell me which things of the camera I need to update to 
> see the image flipped after the Yaw?
>
> Thanks!