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On 3-5-2019 0:46, Ton wrote:
> Cousin Ricky <ric### [at] yahoo com> wrote:
>> On 2019-05-02 6:18 AM (-4), Ton wrote:
>> > Thomas de Groot wrote:
>>>> What a beauty! I never realised somehow that the boiler was oval-shaped.
>>>> I assumed it was circular like the more recent steam locs.
>>>
>>> Bedankt for the compliment.
>>> Is it oval? It's supposed to be a circle, a round circle.
>>
>> Do the camera right & up vectors match the image aspect ratio (16:9)?
>> If I force-view the image at the camera default ratio, which is 4:3, the
>> boiler cross section looks circular.
>>
>> If your camera block lacks these two vectors, you can fix the distortion
>> by adding
>> right 16/9 * x
>> to your camera block.
>
> This is highly embarrassing. Povray 3.8 sets the aspect ratio depending on the
> image format. So I didn't set the right vector in the camera.
> The #version in my pov-file was set to 3.7 however, and then the aspect ratio is
> 1.33.
> There are some hawk-eyed people out there. Thanks everybody.
>
> BTW as excuse for myself: As long as there are no circles in your object, you
> hardly notice! Poor excuse, I know, but better than nothing.
>
> Cheers
> Ton.
>
You can leave all problems behind forever by using:
right x*image_width/image_height
in your camera block. That way your aspect ratio is always correct.
--
Thomas
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