Re: Computer Compositing

[T3D John Bercovitz <bercov@xxxxxxxxxxx>]

Jim C:
>>> Use ye an irregular figure!

John B:
>>And then, prithee, how dost ye judge its shape?

Jim C:
>It's a puzzle, all right.  'mind me again what kinds of shape distortions
>are expected?

I should have prefaced by saying I certainly do agree with you in 
principle; I'd rather have an unknown shape so that internal biases/
knowledge don't mess up the experiment.  Just not sure how to bring
it off.

I haven't thought out what sort of distortion might be present - I
just speculated that having an object's associated parallax conflict 
with its depth placement in the scene would produce a distortion
(amount and type unspecified).  Larry's already noted that he's done 
moderate depth changes and not noticed any distortion so we know (as 
we would expect) that you can get away with it to some degree.  But to
give you a specific answer, I'll have to think.  (We also talked about
keystone distortion but that was a sidebar.)

I think the best bet is for me to solve the geometry problem graphically.  
That could take me a little time and I don't have much today.  So let me 
draw it up and ask Joel to put it on the T3D web site.  As we've all said 
in the past, if the geometry says the object looks some particular way, 
that doesn't necessarily mean you'll see it that way.  The geometry is 
merely the input; the processing can make the perception come out a lot 
different especially if the object is familiar.

John B


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