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In article <3c347970@news.povray.org> , "Rune" <run### [at] mobilixnet dk>
wrote:
>> The camera could not care less for the objects in the scene.
>
> It could perhaps be a bounding problem. Bounding is reliant on both the
> camera and the objects in the scene and automatic bounding is indeed not
> used when the amount of objects is below a certain number.
True, bounding and buffers (are those used with orthographic cameras? - I
don't remember). If the problem goes away with buffers off it is probably
that the code assumes a correct camera vector aspect ratio which gets
"damaged" by "angle". But if the effect is the same with auto bounding and
buffers off, the problem is in the scene.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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Wasn't it Gergely Vandor who wrote:
>
>"Thorsten Froehlich" <tho### [at] trfde> wrote in message
>news:3c339d81$1@news.povray.org...
>> In article <3c339434@news.povray.org> , "Gergely Vandor"
>> <ger### [at] vandordatanethu> wrote:
>>
>> > I bet you are already fed up with plain users arguing with the real
>> > programmer, but this may be interesting :o)
>>
>> Well, computer programs are no magic. What you describe is an effect
>caused
>> by what I explained. There is no check if there are more than two objects
>> to then let some specific ones disappear in POV-Ray, I am sure! :-)
>>
>I understand this is like beating a dead horse, so I only have a last
>question.
>
>In the scene I quoted, it is clear to see that including certain objects
>(objects far away from the camera, etc) make other objects vanish from the
>resulting image. This happens with all the camera options unchanged. Does
>this mean that in this case povray somehow takes the objects of the scene
>into account when interpreting camera options?
It has been previously determined, in another thread[1], that the bug is
only seen if vista buffers get used. By default, POV has vista buffers
switched off when there are less than three objects in a scene and
switched on when there are three or more objects in the scene.
Adding the third object invokes the vista buffer code and makes the
target object dissapear.
Behold: Use -UV in your scene to switch vista buffers off. The scene now
renders correctly however many objects are in your scene.
It might possibly be that the orthographic camera and the vista buffers
are interpreting the camera details differently when the camera keywords
are not in the order that they expect. (e.g. perhaps the vista buffers
are "correcting" for the fact that the angle keyword is in the "wrong"
place, and therefore buffering the scene incorrectly for a camera that
doesn't do so.) It's a bit like having a "bounded_by" in the wrong
place, so the rays never get tested for intersection with the object.
[1] http://news.povray.org/3c2fe9ec@news.povray.org
--
Mike Williams
Gentleman of Leisure
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"Mike Williams" <mik### [at] nospamplease> wrote in message
news:0Qy### [at] econymdemoncouk...
> Wasn't it Gergely Vandor who wrote:
> >
> It has been previously determined, in another thread[1], that the bug is
> only seen if vista buffers get used. By default, POV has vista buffers
> switched off when there are less than three objects in a scene and
> switched on when there are three or more objects in the scene.
>
Thanks. I'm sorry I brought this up again, I overlooked the message
concerned, and I was confused by Thorsten saying this was "not a bug".
---
Gergely
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From Known Bugs - 24 Dec 2001
> BUGS FIXED IN BETA 9
>
>
> Slow render time after several runs
> http://news.povray.org/3c174fda$1@news.povray.org
>
At least in my beta 9 this isn't fixed..
Ari-Matti
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In article <3c38d500$1@news.povray.org> , "Ari-Matti Leppanen"
<ari### [at] tutfi> wrote:
> From Known Bugs - 24 Dec 2001
>
>> BUGS FIXED IN BETA 9
>>
>>
>> Slow render time after several runs
>> http://news.povray.org/3c174fda$1@news.povray.org
>>
> At least in my beta 9 this isn't fixed..
It is fixed. Please read what is wrong with your scene and how it needs to
be changed:
Date: Tue, 01 Jan 2002 11:55:56 +0100
From: "Thorsten Froehlich" <tho### [at] trfde>
Newsgroups: povray.beta-test
Subject: Re: Known Bugs 24 Dec 2001 (beta 9)
Message-ID: <3c3195be@news.povray.org>
Xref: news.povray.org povray.beta-test:3640
Thorsten
____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg
I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org
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"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:3c38f3db@news.povray.org...
> It is fixed. Please read what is wrong with your scene and how it
> needs to be changed:
>
> Date: Tue, 01 Jan 2002 11:55:56 +0100
> From: "Thorsten Froehlich" <tho### [at] trfde>
> Newsgroups: povray.beta-test
> Subject: Re: Known Bugs 24 Dec 2001 (beta 9)
> Message-ID: <3c3195be@news.povray.org>
> Xref: news.povray.org povray.beta-test:3640
>
Are you sure you pointed out the right message? There's talk about evaluate
and max_gradient. My scene doesn't even have isosurfaces.
Ari-Mstti
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In article <3c395b2b@news.povray.org> , "Ari-Matti Leppanen"
<ari### [at] tutfi> wrote:
>> It is fixed. Please read what is wrong with your scene and how it
>> needs to be changed:
>>
>> Date: Tue, 01 Jan 2002 11:55:56 +0100
>> From: "Thorsten Froehlich" <tho### [at] trfde>
>> Newsgroups: povray.beta-test
>> Subject: Re: Known Bugs 24 Dec 2001 (beta 9)
>> Message-ID: <3c3195be@news.povray.org>
>> Xref: news.povray.org povray.beta-test:3640
>>
> Are you sure you pointed out the right message? There's talk about evaluate
> and max_gradient. My scene doesn't even have isosurfaces.
Ups, sorry, I thought you were referring to a different bug.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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Wasn't it Thorsten Froehlich who wrote:
>> another crash with max_intersections
>> http://news.povray.org/j8fo2u8mbo97gi3as0udmab7t9ttap2iom@4ax.com
>
>Will be fixed in next beta. Note that setting max_intersections to 0 isn't
>allowed.
It still crashes in beta 10 for me.
--
Mike Williams
Gentleman of Leisure
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In article <bIK### [at] econymdemoncouk> , Mike Williams
<mik### [at] nospamplease> wrote:
>>> another crash with max_intersections
>>> http://news.povray.org/j8fo2u8mbo97gi3as0udmab7t9ttap2iom@4ax.com
>>
>>Will be fixed in next beta. Note that setting max_intersections to 0 isn't
>>allowed.
>
> It still crashes in beta 10 for me.
Good, then the problem is elsewhere. max_intersections below 1 will be
adjusted to 1 automatically, so that cannot be the problem anymore.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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On Thu, 17 Jan 2002 13:10:20 +0100, "Thorsten Froehlich" <tho### [at] trfde>
wrote:
>>>> another crash with max_intersections
>>>> http://news.povray.org/j8fo2u8mbo97gi3as0udmab7t9ttap2iom@4ax.com
> Good, then the problem is elsewhere. max_intersections below 1 will be
> adjusted to 1 automatically, so that cannot be the problem anymore.
Scene in my original post crashes with max_intersection 1 as I see.
It not depends on intersected object - I mean when I replace sphere (max two
possible intersections) with plane (max one possible intersection) it still
crashes for max_intersection 1, so yes - problem is elsewhere.
ABX
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