"Warp" <war### [at] tagpovrayorg> wrote in message 
news:434eccf0@news.povray.org...
> Chris B <c_b### [at] btconnectcomnospam> wrote:
>> If you're using a perspective camera you'll get problems because you'll 
>> need
>> to adjust for the distortion that perspective introduces (and that is 
>> likely
>> to be inordinately difficult).
>
>  If the plane containing the image map is completely perpendicular to
> the direction of the camera, can you explain what kind of perspective
> distortion happens there?
>
> -- 
>                                                          - Warp

Ah. I think I'm wrong. I was thinking of the distortion you get when a flat 
surface is projected onto the curved surface of a retina, but of course the 
camera in a ray tracer is a perfect point and the projection is onto a flat 
plane, so you should be able to get a mapping from one plane to another. 
With the default image_map scaling giving you an image from <0,0,0> to 
<1,1,0> you should then be able to set the up vector to y and the right 
vector to x with the camera at <0.5,0.5,-1> and look_at <0.5,0.5,0> and get 
a perfect pixel for pixel mapping.

Chris B.

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