Alain <aze### [at] qwertyorg> wrote:


> > But I'm imagining, say, the planet Mars:
> > If it were perhaps far larger in actual size (to take up an area in the sky
> > two or three times the visible diameter of the Moon, for example) while
> > still being so far away, it seems to me that the 'perspective' of the
> > 'closer' and 'farther' parts of the disc would be foreshortened. Based on
> > the idea that, relative to me as the observer at such a distance, the
> > 'distance difference' between the closer and farther parts would be quite
> > small, relatively speaking.

> If Mars was that big, you'd be able to see it's curvature...

Yeah, that's probably true; I came to the same conclusion.

So I finally did a test(!), using a 'typical' camera angle of 67-deg. in
POV-Ray. (No telephoto, in other words.)  And the result is...I don't see much
if *any* perspective difference between small 'nearer' objects and large
'farther' objects. (If it's there, it's very subtle.)  Hmm, not at all the
result that I was expecting. I guess it's time to put this idea to rest. :-(

Or else 'cheat' the scene, to get what I want!  ;-P

Ken

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