Le 06/12/2016 à 03:08, Mike Horvath a écrit :
> On 12/5/2016 12:14 PM, Bald Eagle wrote:
>> I'd like to know the best way to calculate the amount of zoom the
>> orthographic
>> camera needs when changing render size from smaller to larger.
>>
>> I typically define a Zoom variable and then divide up and right by
>> that to zoom
>> in.
>> I can "ball park" it, but I never seem to be able to make a
>> calculation that
>> gets me exact results.
>>
>> Has anyone been able to manipulate the orthographic view accurately and
>> reliably, and can offer a suggestion or solution?
>>
>> Thanks!   :)
>>
>>
> 
> You mean, like this?
> 
>
https://commons.wikimedia.org/wiki/File:Camera_focal_length_distance_house_animation.gif
> 
> 
> Mike

I do not get it.

Bald Eagle talked about orthographic camera, a camera with parallel
rays, usually orthogonal to rendered image.

Mike Horvath showed an animation of a perspective camera with a zoom
using a transformation. Only frame 0 is orthographic.

If you want to have bigger details (bigger than the increase of final
resolution) at the center of the image, you can reduce the up & right
vectors of the orthographic.

Povray camera are not sensible to the final resolution: the same part of
"world" is to be seen, at 64x48, at 640x480 as well as 6400x4800.

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