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> "Bald Eagle" <cre### [at] netscape net> 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! :)
>
> What are trying to do?
> I've been playing with the orthographic camera to make images for Quake2.
> I wanted the scene to match different render sizes.
> I use
> camera{ orthographic
> location <0,0,-10>
> look_at <0,0,0>
> right x*10
> up y*10
> }
>
> I use image_width & image_height to calculate where things should go.
> With image_width & image_height are the same the render image is just bigger or
> small.
> If they are different then one direction will always be limit by 5. That is when
> looking from the -z direction a object place in the x or y (depends on size)
> will be on the border of a rendered image.
>
> I just thought of something I need to try.(it didn't work)
> But maybe this is what you need(haven't tried it).
> if image_width > image_height right x*10*image_width / image_height
> if image_width < image_height up x*10*image_height / image_width
>
> Hope this helps!
> Have fun!
>
>
With your camera defined as in the sample, you see a 10 units by 10
units area.
If you want to double the image size while keeping the same dimention
for the elements of the image, you need to also double the up and right
vectors. So, that become : right x*20 up y*20
If you want to make it automatic, then you need to link those values to
image_width and image_height.
right x*image_width/Size_Adjustment
up y*image_height/Size_Adjustment
one POV unit in the scene. A value of 10 mean that 10 pixels will be
needed to represent each unit.
Alain
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