Severi Salminen wrote:
>>Well, the point of look_at is to provide a center on which the image
>>focusses. For the actual camera focus, focal-blur using a different
>>focal_point might achieve what you're after, since it can effectively blur
>>the look_at position (given the right scene).
>>
>>Aside of that, how about moving look_at somewhere else? I don't get why
>>you'd want the camera to behave irrationally and look at something
> 
> different
> 
>>than look_at. :-S
> 
> 
> For the same reason as large format cameras have the ability to move the
> film plane (shifting) so that the center axis of the lens does not point at
> the center of the film. This allows quite interesting (and many times very
> useful) perspective corrections/alterations. It is not about focal blur. I
> think this is what Tom wants to accomplish? Basically this can be
> accomplished by rendering only a portion of a larger image, but it is an
> "ugly" way to do it.
> 
> POV-Ray lacks a couple more or less useful things such as defining the
> direction focus plane when using focal blur, the shifting (as above) etc.
> These would be useful things to add at some point.
> 
> Severi Salminen
> 
Ah I get it now.  Divorse the lens perspective from the frame of the 
picture.

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