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Hello all,
I have not posted in a long, long time, but now I am back doing some
raytracing and I need some help (go figure..). Anyway, I have been using Max
recently with the Brazil rendering system plug-in, and the results are nice,
but the fact is, I hate modeling in Max. So I have come back to Pov.
My question is this...The first picture (caustinc_ring_2.jpg) represents
a render I did with Brazil to test its caustics, the second picture
(torus.jpg) is a photon image that I did in MegaPov just trying to get some
caustics as a start. But, as you can see..it looks like absolute crap. Why
is the ring glowing like that, and why are there no caustics in the familiar
parabolic shape?
Thanks - Oldstench
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Attachments:
Download 'torus.jpg' (27 KB)
Download 'caustic_ring_2.jpg' (25 KB)
Preview of image 'torus.jpg'
Preview of image 'caustic_ring_2.jpg'
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"Oldstench" <tha### [at] hotmail com> wrote in message
news:3cffb852@news.povray.org...
> My question is this...The first picture (caustinc_ring_2.jpg)
represents
> a render I did with Brazil to test its caustics, the second picture
> (torus.jpg) is a photon image that I did in MegaPov just trying to get
some
> caustics as a start. But, as you can see..it looks like absolute crap. Why
> is the ring glowing like that, and why are there no caustics in the
familiar
> parabolic shape?
Your images posted reverse order of message text, but not hard to figure
that out.
I got an okay rendering done in the POV-Ray RC5 (beta 3.5), not sure what
happened to you with MegaPOV. I have seen the classic ring as rendered in
MegaPOV doing what you were trying though. Curiously, your attempt looks
more like radiosity, but it could just be a matter of 'count' and 'gather'
settings, possibly even 'ignore_photons' or something else entirely. I
couldn't say.
The attached image used v3.5, not MegaPOV, starting with just the Insert
Menu scene template for photons. Which means I used 'spacing 0.02' at first
is all, and it already did as expected. For this final image it was 0.03,
reflection only, area_light, max_trace_level 9. AA set to 0.01 depth of 5,
took 18m 36s for this 800MHz P3 while I did other things. Note that the AA
on the edges of the ring aren't exactly what I'd call great. Your Brazil
example looks very refined.
bob h
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Attachments:
Download 'reflectinglightring0.jpg' (8 KB)
Preview of image 'reflectinglightring0.jpg'
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How about this?
Post a reply to this message
Attachments:
Download 'test.jpg' (20 KB)
Preview of image 'test.jpg'
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Cool!
I'm gonna try this for my little key...
--
Apache
POV-Ray Cloth experiments: http://geitenkaas.dns2go.com/experiments/
Email: apa### [at] yahoocom
ICQ: 146690431
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That looks better than the Brazil image IMHO.
--
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Warp <war### [at] tagpovrayorg> wrote in message news:3d001cc4@news.povray.org...
> How about this?
>
>
Wow, that looks much better then mine, you are really good....
-Oldstench
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Wow, that's very nice, though the caustics don't appear quite as realistic
to me in this as they did in the brazil image. I'm sure it's just a matter
of a slightly different shape of ring, though.
- Slime
[ http://www.slimeland.com/ ]
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Hello. Here is the POV 3.5 version. I used no lights, only radiosity
settings and an ambient sphere. Render time was 7m 45s
Here is the POV code:
global_settings{
max_trace_level 50
radiosity{
error_bound .125 count 1575 nearest_count 10
recursion_limit 1 normal on
brightness 13.5 gray_threshold 0
pretrace_start .08 pretrace_end .005
always_sample on
}
}
camera{location<0,30,-50> look_at 0 angle 40 }
sphere{<100,50,-50>,40
pigment{rgb 1}
finish{ambient 1}
no_shadow double_illuminate
}
background{rgb .025}
plane{y,-2 pigment{rgb .7} finish{ambient 0} }
union{
torus{11,1 translate y*1}
torus{11,1 translate y*-1}
cylinder{y*-1,y*1,12 open}
cylinder{y*-1,y*1,10 open}
pigment{rgb .1}
finish{reflection .9 ambient 0}
}
Oldstench wrote:
> My question is this...The first picture (caustinc_ring_2.jpg) represents
> a render I did with Brazil to test its caustics, the second picture
> (torus.jpg) is a photon image that I did in MegaPov just trying to get some
> caustics as a start. But, as you can see..it looks like absolute crap. Why
> is the ring glowing like that, and why are there no caustics in the familiar
> parabolic shape?
> Thanks - Oldstench
>
>
>
--
Samuel Benge
sbe### [at] caltelcom
Post a reply to this message
Attachments:
Download 'ring.jpg' (16 KB)
Preview of image 'ring.jpg'
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why 'double_illuminate' ?
--
Apache
POV-Ray Cloth experiments: http://geitenkaas.dns2go.com/experiments/
Email: apa### [at] yahoocom
ICQ: 146690431
Post a reply to this message
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Apache wrote:
> why 'double_illuminate' ?
Because I'm silly and left that in by accident. I keep a test scene
around for this type of thing; I had been testing a similar scene with
actual photons, and the sphere was origially just used to give the ring
a nice highlight. A light_source was inside the sphere, and the
ambient_light was 0, so I had to give the sphere the double_illuminate
and no_shadow flags.
--
Samuel Benge
sbe### [at] caltelcom
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