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clipka <ano### [at] anonymous org> wrote:
> Am 15.12.2012 20:51, schrieb MichaelJF:
> > clipka <ano### [at] anonymous org> wrote:
> >> Am 12.12.2012 14:56, schrieb gregjohn:
> >>> Hi. I was starting to experiment with the use of povray to make a single-image
> >>> sprite sheet. It would of course be useful to make it using an orthographic
> >>> camera. But my figures are getting cut off. Is there a way around this?
> >>> TIA.
> >>
> >> Move the camera further away, maybe?
> >
> > Moving away an orthographic camera? What should be achieved from this?
>
> Making the figures not getting cut off.
>
> Even in an orthographic render, the cameria position determines what you
> see: Everything "in front" of the camera is viwithsible, everiything "behind"
> is not.
With the orthographic camera the up and right vectors determines the visible
scene and nott
the distance of the camera to the desired objects. As far as i experienced.
Best regards,
michael
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Le 15/12/2012 22:12, MichaelJF nous fit lire :
> clipka <ano### [at] anonymous org> wrote:
>> Am 15.12.2012 20:51, schrieb MichaelJF:
>>> clipka <ano### [at] anonymous org> wrote:
>>>> Am 12.12.2012 14:56, schrieb gregjohn:
>>>>> Hi. I was starting to experiment with the use of povray to make a single-image
>>>>> sprite sheet. It would of course be useful to make it using an orthographic
>>>>> camera. But my figures are getting cut off. Is there a way around this?
>>>>> TIA.
>>>>
>>>> Move the camera further away, maybe?
>>>
>>> Moving away an orthographic camera? What should be achieved from this?
>>
>> Making the figures not getting cut off.
>>
>> Even in an orthographic render, the cameria position determines what you
>> see: Everything "in front" of the camera is viwithsible, everiything "behind"
>> is not.
>
> With the orthographic camera the up and right vectors determines the visible
> scene and nott
> the distance of the camera to the desired objects. As far as i experienced.
Yet, if an object is behind the camera rectangular-plane (for
orthographic, it's not a point-camera), it is not on the picture.
The length of direction's vector is irrelevant (as long as not 0), yet
the orthographic camera has no eye on the back of its head.
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May I say that this whole thread supports my claim that the camera docs, notably
the diagram, don't explain what it the orthographic camera does? I presume
everyone posting in this thread has in fact RTFM.
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Am 17.12.2012 13:54, schrieb gregjohn:
> May I say that this whole thread supports my claim that the camera docs, notably
> the diagram, don't explain what it the orthographic camera does? I presume
> everyone posting in this thread has in fact RTFM.
The diagram indeed only explains the standard perspective camera.
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clipka <ano### [at] anonymous org> wrote:
> Am 17.12.2012 13:54, schrieb gregjohn:
> > May I say that this whole thread supports my claim that the camera docs, notably
> > the diagram, don't explain what it the orthographic camera does? I presume
> > everyone posting in this thread has in fact RTFM.
>
> The diagram indeed only explains the standard perspective camera.
Okay, so the community (if not me) should cough up a diagram that explains
exactly what orthographic is up to.
But even the standard camera doc/diagram piles on both critically needed
parameters, and I-guess-if-you-need-to-specify-it-that-way parameters, without
explaining how the redundant ones interact with the critical ones or which order
is critical, into one big pile.
up / right/ angle/ position/ look_at, etc.
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On 12/17/2012 10:23 AM, gregjohn wrote:
> clipka <ano### [at] anonymous org> wrote:
>> Am 17.12.2012 13:54, schrieb gregjohn:
>>> May I say that this whole thread supports my claim that the camera docs, notably
>>> the diagram, don't explain what it the orthographic camera does? I presume
>>> everyone posting in this thread has in fact RTFM.
>>
>> The diagram indeed only explains the standard perspective camera.
>
> Okay, so the community (if not me) should cough up a diagram that explains
> exactly what orthographic is up to.
>
> But even the standard camera doc/diagram piles on both critically needed
> parameters, and I-guess-if-you-need-to-specify-it-that-way parameters, without
> explaining how the redundant ones interact with the critical ones or which order
> is critical, into one big pile.
> up / right/ angle/ position/ look_at, etc.
You guys come up with something and I'll make sure it finds it's way
into the docs ...
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"MichaelJF" <mi-### [at] t-online de> wrote:
> clipka <ano### [at] anonymous org> wrote:
> > Am 15.12.2012 20:51, schrieb MichaelJF:
> > > clipka <ano### [at] anonymous org> wrote:
> > >> Am 12.12.2012 14:56, schrieb gregjohn:
> > >>> Hi. I was starting to experiment with the use of povray to make a single-image
> > >>> sprite sheet. It would of course be useful to make it using an orthographic
> > >>> camera. But my figures are getting cut off. Is there a way around this?
> > >>> TIA.
> > >>
> > >> Move the camera further away, maybe?
> > >
> > > Moving away an orthographic camera? What should be achieved from this?
> >
> > Making the figures not getting cut off.
> >
> > Even in an orthographic render, the cameria position determines what you
> > see: Everything "in front" of the camera is viwithsible, everiything "behind"
> > is not.
>
> With the orthographic camera the up and right vectors determines the visible
> scene and nott
> the distance of the camera to the desired objects. As far as i experienced.
>
> Best regards,
> michael
Sorry, Clipka was right as ever. I use the orthographic camera only as an
auxilliary tool to view objects which are within or very close to a plane (e.g.
for creating hight_fields) and look perpendicular to this plane, so I didn't
came up with the idea to use the this camera within the middle of a complete
(real) 3d scene. There it cuts of all behind the camera with explains the broken
legs above.
One is influenced by one's habits sometimes too much..
Best regards,
Michael
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James Holsenback <nom### [at] none com> wrote:
>
> You guys come up with something and I'll make sure it finds it's way
> into the docs ...
Not sure if it's docworthy or not, but here's one I whipped up in MegaPOV...
The blue rectangle represents the camera (origin, orientation, size) and within
it lies an actual view of the scene. The yellow lines indicate the portion of
the scene the camera is viewing. The red figures march through the orthographic
camera's plane, becoming purple (image 1), or clipped (image 2).
Sam
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Attachments:
Download 'orthocam.png' (135 KB)
Preview of image 'orthocam.png'
![orthocam.png](/povray.binaries.images/attachment/%3Cweb.50cfa09cb526f522111572a80%40news.povray.org%3E/orthocam.png?preview=1)
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"gregjohn" <pte### [at] yahoo com> wrote:
> May I say that this whole thread supports my claim that the camera docs, notably
> the diagram, don't explain what it the orthographic camera does? I presume
> everyone posting in this thread has in fact RTFM.
I've gone back to the docs on occasion when I'm doing something unusual with the
perspective camera, but I don't recall the last time I did it for the
orthographic camera; it may have been as long ago as February of 2004.
What is clear to me now is that "angle" makes no physical sense with the
orthographic camera, so I never use that keyword. I just use the right and up
vectors to describe the viewport and be done with it.
I do recall having trouble with the orthographic camera in the misty, distant
past, but whatever the trouble was, my brain didn't see the value in retaining
it. It may have been foolish attempts to use the sky sphere with this camera;
or it may have been an abortive attempt to make the angle keyword behave before
discovering that the right and up keywords do exactly what I needed done. (Come
to think of it, the sky sphere episodes might be recurring, ending with me
slapping my forehead every time.)
Sam's illustration conveys the camera much better than the existing diagram in
the docs, although Sam's illustration doesn't have a place for the angle. I
have made no attempt to verify whether the angle keyword in fact does what the
diagram in the docs implies.
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"Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> Sam's illustration conveys the camera much better than the existing diagram in
> the docs, although Sam's illustration doesn't have a place for the angle.
Yes, indeed. But for a documentation or tutorial it needs more explanation (e.g.
meaning of up and right). The problem with writing a doc or tut is, that one has
to know which parameters are used by a special type of camera and which are not.
Angle seems to make no sense, but is it ignored completelly when specified in
the orthographic camera?
Best regards,
Michael
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