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> Ron Parker wrote:
> >
> > It sounds like you're looking for caustics. You might give MegaPOV a
look
> > for its photon mapping feature. (http://nathan.kopp.com/patched.htm)
> >
>
> Although in this case the fake caustics in regular POV shoud give an ac
ceptable
> result (see subsection "Faked Caustics" in the "Interior" section)
>
> --
> Margus Ramst
>
> Personal e-mail: mar### [at] peak eduee
> TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg
> Home page http://www.hot.ee/margusrt
( what I am trying to do is imaging about under_water
simulation, and stuff like that... Say, a clear water,
with some visible ground in the bottom...
I am using an interior and a media statement
into a finite box of a given size, with the hollow keyword.)
I am not quiet sure if the caustic effect is what is doing the
spot of "moving" lights and shadows on a under-water ground.
Is it caustic ? Anyway I will try it; It would be nice, if it worked;
I have found something special in term of water-texture, with
some "normal { agate scale }", but it doesn't give any spots
of shadows at all...
Thanx a lot for the responses
Alex
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Florentine Audet wrote:
> ( what I am trying to do is imaging about under_water
> simulation, and stuff like that... Say, a clear water,
> with some visible ground in the bottom...
Caustics are most certainly the effect you are looking for.
This is the effect you see at the bottom of a swimming pool
or the light shining through a glass of water.
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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Florentine Audet wrote:
> Is it caustic ? Anyway I will try it; It would be nice, if it worked;
> I have found something special in term of water-texture, with
> some "normal { agate scale }", but it doesn't give any spots
> of shadows at all...
You can use normal and photons to do this but you can also fake it with a color_map.
G.
// using a color_map
camera {location <2,3,-4> direction z up y right x*4/3 look_at <0,0,0>}
light_source {<-200,100,100> color rgb 2}
box{<-2,0,-1>,<2,0.01,2> pigment{bozo poly_wave 0.5 color_map{[0 rgb<0.3,1,1>][1
rgbf<0.3,1,1,1>]} scale 0.5} translate y}
plane{y,0 pigment{rgb 1}}
// using photons
#version unofficial Megapov 0.6;
global_settings{photons {count 20000}}
camera {location <2,3,-4> direction z up y right x*4/3 look_at <0,0,0>}
light_source {<-200,100,100> color rgb 2}
box{<-2,0,-1>,<2,0.01,2> pigment{rgbf<0.3,1,1,1>} interior{ior 1.33} normal{crackle 2
scale 0.3} photons {target 1 refraction on }translate y}
plane{y,0 pigment{rgb 1}}
--
**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery
--
**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery
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Thank You all very much.
I think I will use "caustics", I tried it a little bit today,
and it seems to work very well. It should appear to
you as a very basic optional keyword, but for
myself I didn't use this function before...
... The color_map "fake" seems to be
a very good idea too ! ( probably better if
you want to see rays of light go through the water
volume, with the scattering function ??! Or does
the particules will interact with the caustics effect
as small objects -surely - and show us
the rays of ligth through the water...
... I will try to take a guess with all that stuff
this week-end .
It is my first use of a forum; It seems to me to be
pretty rich and interesting... So, thanks a lot
for these quick answers !!
Alex
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