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Mike Williams wrote:
> I am trying to setup a scene underwater. I am not yet good with media. Does
> anyone have ideas how to make a good underwater media?
I've found that using low media sample of 1 often produces adequate
results, where 2 or 3 give blotchy results, not looking decent until
samples ot 20...and sample of 1 is a lot quicker ;)
also I habitually use confidence of 0.0001 and variance of 1.
to get underwater sun-beams, make a large hollow box, place camera
within. place a light source external to the box, put a sphere with
a turbulent pattern of your choice varying from opaque to transmit 1
around that light. this gives a nice texture on the surface of the
water, and beams of light. for water colour, try a fade distance
appropriate to scene, and a blue emission colour.
--
--Tim Cook
http://empyrean.scifi-fantasy.com
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------
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"Mike Williams" <mic### [at] quixnet net> wrote in message
news:3e1e4d4a@news.povray.org...
> I am trying to setup a scene underwater. I am not yet good with media. Does
> anyone have ideas how to make a good underwater media?
>
> thanks
>
Here's where I got to with this...
#version 3.5;
#include "colors.inc"
#include "functions.inc"
#declare Photon_sp = 0.2; //.2
#declare Cont_rad = 35; // 35
#declare Sea_col = <1,1,1,1>; //<0.5,0.9,1.0,1.0>;
#declare Sea_medcol = <0.8,0.2,0.1>*0.75; // 0.75
#declare Dens_min = 0.1;//.1
#declare Cam_z = -15;
#declare Do_sea = true;
#if(abs(Cam_z)+10>(Cont_rad))
Camera too far away!
#end
global_settings {
assumed_gamma 1.0
ambient_light 0
photons{
spacing Photon_sp
autostop 0 jitter 0.4
media 100
save_file "seabed.ph"
//load_file "seabed.ph"
}
}
#declare Dens_func = function(x,y,z){min(1,Dens_min + pow(x/(Cont_rad),2) +
pow(z/(Cont_rad),2))}
#declare Sea_media =
media{
method 3
intervals 10
samples 3,15
scattering {1,0.025 extinction 0.8} //0.025 0.8
absorption Sea_medcol
density{function{Dens_func(x,y,z)}}
}
// ----------------------------------------
camera {
location <0.0, 0.0, Cam_z>
look_at <0.0, -5.0, 35>
}
sky_sphere {
pigment {
wrinkles scale 0.25
color_map {
[0.0 rgb <0.6,0.7,1.0>]
[0.7 rgb <0.2,0.4,0.8>]
}
}
}
light_source {
<0, 0, 0>
color rgb <1, 1, 1>*5
media_interaction on
media_attenuation on
fade_distance 1500
fade_power 2
translate <1000, 2000, -500>
}
// ----------------------------------------
#declare Bed_func = function(x,y,z){
y +
5 +
(sin(x*5 - sin(z + f_noise3d(x,0,z))*1)/20) -
(sin((x+z)*1 -
sin(z + f_noise3d(x,0,z))*1)/30)
}
#declare Bed_base =
difference{
isosurface {
function { Bed_func(x, y, z) }
contained_by {sphere{0,Cont_rad}}
accuracy 0.001
max_gradient 2
rotate y*35
}
plane{z,Cam_z-10}
pigment{rgb<0.9,0.9,0.6>}
}
#declare Sea_func = function(x,y,z){y - 5}
#declare Sea_top =
difference{
isosurface{
function { Sea_func(x*1, y*1, z*1) }
contained_by {sphere{0,Cont_rad}}
accuracy 0.001
max_gradient 5
rotate y*25
}
plane{z,Cam_z-10}
pigment{rgbf Sea_col}
normal{bozo 5 scale 1/4}
hollow
photons{target refraction on reflection on}
finish{
reflection{fresnel on}
ambient 0 diffuse 0 conserve_energy
}
interior{
ior 1.34
media{Sea_media}
}
}
#declare Wall =
difference{
sphere{0,Cont_rad}
sphere{0,Cont_rad - 0.01}
plane{y,-7}
plane{-y,-7.5}
plane{z,Cam_z-10}
pigment{rgb 0}
photons{collect off}
}
object{Bed_base}
object{Sea_top}
object{Wall}
sphere{
0,4
scale <1,1.5,1>
pigment{rgb 0.5}
normal{agate scale 10}
normal{granite scale 1/4}
translate <0,-3,0>
}
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