scenes/camera/shear.pov

I'm wondering what's going on here...

==== [Parsing...] ==========================================================
File 'shear.pov' line 48: Parse Warning: Camera vectors are not 
perpendicular.
  Making look_at the last statement may help.

Snippet from shear.pov:

8< snip >8
camera {
         perspective //keyword is facultative in this case
         location CamLoc
         right     x*image_width/image_height
         angle 90
         transform Shear // comment out to see 'falling buildings'
         rotate <0,45,0>
         look_at CamLook
         }
8< snip >8

Command was:
thh@quadro:~/POVRAY_MASTER/share/povray-3.7/scenes/camera$ povray 
shear.pov +p -w320 -h240 -uv

Look_at _is_ last statement of the camera definition and -uv _is_ used.

Is the warning mentioned above really necessary?

-- 
Thorsten aka ThH

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