|
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
This is my feeble attempt at recreating Henric Wann Jensen's cool "classic
cardioid" caustic pattern (http://www.gk.dtu.du/home/hwj/ and
http://www.gk.dtu.dk/home/hwj/pictures/metalring.jpg) using Nathan Kopp's
Photon Patch for POV-Ray (http://www.nathan.kopp/photons.htm).
The problem with this (did I say feeble) attempt, is that as you can see,
the ray's are almost focused, but not quite. This is simply because the
light source is a skosh too high (as you can also see when you compare the
length of the shadow behind the object with the shadow in HWJ's version.
But... if I try to bring the light up any higher, all of the caustics
disappear.
I've posted the scene file in povray.text.scene-files if anyone would be so
kind to have a look.
By the way, I can see why HWJ used a wood-grain table setting. It really
does bring out the caustic effect. I just grabbed one of the standard wood
textures from the POV includes, but it gives the desired effect.
Post a reply to this message
Attachments:
Download 'DavesRing.JPG' (26 KB)
Preview of image 'DavesRing.JPG'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
The problem will probably be corrected if you increase the 'autostop' angle.
Set it to 45 (degrees) and things should work. Soon I'll have a FAQ that
explains this.
-Nathan
David Cook wrote:
>
> This is my feeble attempt at recreating Henric Wann Jensen's cool "classic
> cardioid" caustic pattern (http://www.gk.dtu.du/home/hwj/ and
> http://www.gk.dtu.dk/home/hwj/pictures/metalring.jpg) using Nathan Kopp's
> Photon Patch for POV-Ray (http://www.nathan.kopp/photons.htm).
>
> The problem with this (did I say feeble) attempt, is that as you can see,
> the ray's are almost focused, but not quite. This is simply because the
> light source is a skosh too high (as you can also see when you compare the
> length of the shadow behind the object with the shadow in HWJ's version.
> But... if I try to bring the light up any higher, all of the caustics
> disappear.
>
> I've posted the scene file in povray.text.scene-files if anyone would be so
> kind to have a look.
>
> By the way, I can see why HWJ used a wood-grain table setting. It really
> does bring out the caustic effect. I just grabbed one of the standard wood
> textures from the POV includes, but it gives the desired effect.
>
> [Image]
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Thanks Nathan (and let me join the line of appreciative users of your
patch)! Here's the resulting image, and I've posted the source as a followup
in povray.text.scene-files. I have to humbly admit that I'm a little unclear
on what's going on with the photon parameters. I'll be looking forward to
your FAQ.
Nathan Kopp <Nat### [at] Koppcom> wrote in message
news:36F7B744.D92F3465@Kopp.com...
> The problem will probably be corrected if you increase the 'autostop'
angle.
> Set it to 45 (degrees) and things should work. Soon I'll have a FAQ that
> explains this.
>
> -Nathan
>
> David Cook wrote:
> >
> > This is my feeble attempt at recreating Henric Wann Jensen's cool
"classic
> > cardioid" caustic pattern (http://www.gk.dtu.du/home/hwj/ and
> > http://www.gk.dtu.dk/home/hwj/pictures/metalring.jpg) using Nathan
Kopp's
> > Photon Patch for POV-Ray (http://www.nathan.kopp/photons.htm).
> >
> > The problem with this (did I say feeble) attempt, is that as you can
see,
> > the ray's are almost focused, but not quite. This is simply because the
> > light source is a skosh too high (as you can also see when you compare
the
> > length of the shadow behind the object with the shadow in HWJ's version.
> > But... if I try to bring the light up any higher, all of the caustics
> > disappear.
> >
> > I've posted the scene file in povray.text.scene-files if anyone would be
so
> > kind to have a look.
> >
> > By the way, I can see why HWJ used a wood-grain table setting. It really
> > does bring out the caustic effect. I just grabbed one of the standard
wood
> > textures from the POV includes, but it gives the desired effect.
> >
> > [Image]
Post a reply to this message
Attachments:
Download 'DavesRing2.JPG' (31 KB)
Preview of image 'DavesRing2.JPG'
|
|
| |
| |
|
|
|
|
| |
|
|