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I have a very minimal scene with a blob that does not behave like I
expect it.
Basically it is the first tutorial scene from 3.6.1 with two extra
spheres added above the originals. It seems to render some artifacts
where the top spheres connect to the bottom ones.
I am new to POV-Ray and don't know the right way to do this. But I
expect just dropping the scene files into p.b.scene-files would not be
the way to go so I thought I'd ask here.
Thanks for your time,
Rob
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"Rob Hoopman" <rob### [at] tuna nl> wrote in message
news:3D6### [at] tunanl...
> I am new to POV-Ray and don't know the right way to do this. But I
> expect just dropping the scene files into p.b.scene-files would not be
> the way to go so I thought I'd ask here.
Have a read of Rune's blob tutorial:
http://runevision.com/3d/blobs/blobs.asp
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"Rob Hoopman" <rob### [at] tunanl> wrote in message
news:3D6### [at] tunanl...
> I have a very minimal scene with a blob that does not behave like I
> expect it.
> Basically it is the first tutorial scene from 3.6.1 with two extra
> spheres added above the originals. It seems to render some artifacts
> where the top spheres connect to the bottom ones.
>
> I am new to POV-Ray and don't know the right way to do this. But I
> expect just dropping the scene files into p.b.scene-files would not be
> the way to go so I thought I'd ask here.
A short, concise, sample of a problem scene file is fine posted as text here
in p.g.
Have you already tried sturm in the blob statement? If not then that's
something to check on. It could be a shadows on the surface normals thing,
the blob equation causing erratic changes in it. If that doesn't seem to be
it a posting of a render showing it would be good to see, at p.b.i. or at
least the blob + camera + light script so someone else besides you can
render it.
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Alan Holding wrote:
> "Rob Hoopman" <rob### [at] tunanl> wrote in message
> news:3D6### [at] tunanl...
>
>>I am new to POV-Ray and don't know the right way to do this. But I
>>expect just dropping the scene files into p.b.scene-files would not be
>>the way to go so I thought I'd ask here.
>
>
> Have a read of Rune's blob tutorial:
> http://runevision.com/3d/blobs/blobs.asp
>
>
I did, allthough his site down at the moment, well not so much down as
having problems connecting to the database.
Rob
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Blobs have artifacts, sometimes. This is still a problem with POV, but you
could try to move each blob component away from the others. They must not be
very close to each other.
Regards,
Hugo
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hughes b wrote:
> "Rob Hoopman" <rob### [at] tunanl> wrote in message
> news:3D6### [at] tunanl...
>
>>I have a very minimal scene with a blob that does not behave like I
>>expect it.
>>Basically it is the first tutorial scene from 3.6.1 with two extra
>>spheres added above the originals. It seems to render some artifacts
>>where the top spheres connect to the bottom ones.
>>
>>I am new to POV-Ray and don't know the right way to do this. But I
>>expect just dropping the scene files into p.b.scene-files would not be
>>the way to go so I thought I'd ask here.
>
>
> A short, concise, sample of a problem scene file is fine posted as text here
> in p.g.
>
> Have you already tried sturm in the blob statement? If not then that's
> something to check on. It could be a shadows on the surface normals thing,
> the blob equation causing erratic changes in it. If that doesn't seem to be
> it a posting of a render showing it would be good to see, at p.b.i. or at
> least the blob + camera + light script so someone else besides you can
> render it.
>
>
I had a look at the docs regarding the sturm keyword and don't think it
would solve my problem. (Allthough I must say it is not exactly clear to
what values I would have to set it. What is a "boolean float value",
does this mean any float value that is not zero evaluates to true?)
If it helps I can also post an image to p.b.i.
Rob
Post a reply to this message
Attachments:
Download 'us-ascii' (1 KB)
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> camera {
> angle 15
> location <0,2,-10>
> look_at <0,0,0>
> }
Narrow camera angles can make stuff show up wrong... try it with one like this
camera {
location <0,0,-2.25>
look_at <0,0,0>
}
--
Tim Attwood
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I tested your scene and fiddled with the variables (if you remove "angle"
from camera, the problem will disappear in this particular case) but
basically, it's caused by the current limitation of blobs. The blob bugs
were not fixed in POV3.5. If you wish, you can read about them here:
http://news.povray.org/search/advanced/?s=blob&bug&b=Search&g=povray.beta-te
st&a=0&p=0
- Hugo
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From: Rob Hoopman
Subject: Thank you and Tim, problem solved. [n.t.]
Date: 25 Aug 2002 17:22:09
Message: <3D6966D6.1020506@tuna.nl>
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n.t.
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Rob Hoopman wrote:
> Alan Holding wrote:
>> Have a read of Rune's blob tutorial:
>> http://runevision.com/3d/blobs/blobs.asp
>
> I did, allthough his site down at the moment,
> well not so much down as having problems
> connecting to the database.
What the...!??
I was not aware of that. I'll have to look into that. Problem is that I
don't have much time right now, but I'll see what I can do.
Rune
--
3D images and anims, include files, tutorials and more:
rune|vision: http://runevision.com (updated July 12)
POV-Ray Ring: http://webring.povray.co.uk
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Rune wrote:
> Rob Hoopman wrote:
>
>>Alan Holding wrote:
>>
>>>Have a read of Rune's blob tutorial:
>>>http://runevision.com/3d/blobs/blobs.asp
>>
>>I did, allthough his site down at the moment,
>>well not so much down as having problems
>>connecting to the database.
>
>
> What the...!??
>
> I was not aware of that. I'll have to look into that. Problem is that I
> don't have much time right now, but I'll see what I can do.
>
Don't you just hate running your own website during weekends :-).
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Rob Hoopman wrote:
> Don't you just hate running your own website during weekends :-).
Well, it's not on my own server if that's what you mean. I don't know
what the error means ([Microsoft][ODBC Microsoft Access Driver] System
resource exceeded.). Is there even anything I can do, or is it my web
host's fault?
Followup-to povray.off-topic
Rune
--
3D images and anims, include files, tutorials and more:
rune|vision: http://runevision.com (updated July 12)
POV-Ray Ring: http://webring.povray.co.uk
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"Rob Hoopman" <rob### [at] tunanl> wrote in message
news:3D6### [at] tunanl...
> I had a look at the docs regarding the sturm keyword and don't think it
> would solve my problem. (Allthough I must say it is not exactly clear to
> what values I would have to set it. What is a "boolean float value",
> does this mean any float value that is not zero evaluates to true?)
I didn't notice if anyone answered that. boolean "float value" could be a
little misleading. Means it can be any number or true/false, yes/no, on/off.
Non-zero means on, zero means off. At least I think it does. I usually try
to use the terminology that seems appropriate for the part it's being used
at.
sturm keyword alone is essentially saying to use it, otherwise you would put
sturm off.
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> boolean "float value"
I guess the reason why it's called "float" is that there are no integers in
POV, only vectors or floats. When you are supposed to enter one value, the
docs say "float value".. Multiple values are called vectors or color
expressions.
-Hugo
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Rob Hoopman <rob### [at] tunanl> wrote in news:3D6### [at] tunanl:
> I have a very minimal scene with a blob that does not behave
> like I expect it.
I just discouvered that too, but as others have mentioned blobs
still have bugs.
Here is the code that generated weird artifacts in my test
//////////
//////////
//////////
#version 3.5;
global_settings { assumed_gamma 1.0 }
camera {
location <3, 3, -3>
direction 1.5*z
right x*image_width/image_height
look_at <0,1,0>
}
light_source {
<0, -10, -250>
rgb 2
parallel
point_at <0,0,0>
}
#declare T = 1 ;
#declare S = 1 ;
blob {
threshold T
sphere { < 0, 0, 0 >, 1, S }
sphere { < -1, 1, 0 >, 1, S }
sphere { < 0, 1, 1 >, 1, S }
sphere { < 0, 1, 0 >, 1, S }
sphere { < 0, 1,-1 >, 1, S }
sphere { < 1, 1, 0 >, 1, S }
sphere { < 0, 2, 0 >, 1, S }
pigment { rgb < .3, 0, 0 > }
finish { ambient .2 diffuse .3 }
}
//////////
//////////
//////////
--
(MIKA) Marc Champagne
marcch.AT.videotron.DOT.ca
Montreal, CANADA
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Attachments:
Download 'test.jpg' (6 KB)
Preview of image 'test.jpg'
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In article <Xns### [at] 204213191226>,
Marc Champagne <nos### [at] pleasecom> wrote:
> I just discouvered that too, but as others have mentioned blobs
> still have bugs.
It could easily be precision artifacts, instead of any sort of bug. Your
code doesn't even use "sturm".
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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I see that sturm doesn't help it any. The clipped parts seem to coincide
with the actual surfaces of the component parts. An I noticed it only
happens for the nearer components and not the farther ones, I looked at it
from other sides to see that.
--
Farewell,
Bob
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
>
> It could easily be precision artifacts, instead of any sort of bug. Your
> code doesn't even use "sturm".
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Christopher James Huff <chr### [at] maccom> wrote in
news:chr### [at] netplexaussieorg:
> It could easily be precision artifacts, instead of any sort of bug.
> Your code doesn't even use "sturm".
I had tried sturm but failed to mention it.
--
(MIKA) Marc Champagne
marcch.AT.videotron.DOT.ca
Montreal, CANADA
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Marc Champagne wrote:
> Christopher James Huff <chr### [at] maccom> wrote in
> news:chr### [at] netplexaussieorg:
>
>
>>It could easily be precision artifacts, instead of any sort of bug.
>>Your code doesn't even use "sturm".
>>
>
> I had tried sturm but failed to mention it.
>
It's not a precision artifacts, it's a wrong optimisation code.
See p.b.i if you want to see the correct blob.
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Le Forgeron <jgr### [at] freefr> wrote in news:3D9### [at] freefr:
>> I had tried sturm but failed to mention it.
>
> It's not a precision artifacts, it's a wrong optimisation code.
> See p.b.i if you want to see the correct blob.
Yes I saw p.b.i, thanks, I feel a little les dumb, I'll leave this
problem to the math gurus :)
--
(MIKA) Marc Champagne
marcch.AT.videotron.DOT.ca
Montreal, CANADA
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