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Hi all,
I'm a rather newbie in povray so... ;)
Here's some scene with simple winlogo. It's in two versions to render:
one with metallic textures and one with glass. The first one renders in
a few minutes :) and the second one in a few hours... Is there a way to
make it a little bit faster?
The biggest problem I had with textures was the environment - I've
chosen some bitmap which had to act as an environment for reflections.
Every render I tried ended with strange and obvious patterns on the
surfaces :[ I've spent hours before I've decided to change the bitmap -
and that was it :) Patterns gone away.
Then with the glassy version I had problems with the transmission
colours I wanted to achieve, I tried zillions of
fade_distance/fade_power combinations ;) in addition, I've suddenly
after next few hours I discovered that the very strong influence on that
has the roughness parameter. And thus I've found the proper values :)
The objects itself are isosurfaces. For the first time I've built them
from an extruded surface and wanted to make them have rounded edges...
but had no idea how to make for example f_rounded_box bended with sin(x)
function - one question on p.newusers and I know it already :) btw, is
there a really good tutorial on all those substitutions and so on with
isosurfaces? I'd really like to learn it thoroughly...
After making it looking good, I wanted to put some photons. Never
succeeded to make it good :( Any good tutorial somewhere?
OK, so here it goes, the scene itself:
// Persistence of Vision Ray Tracer Scene Description File
// File: MSWindows.pov
// Vers: 3.6
// Desc: MS Windows logo variation
// Date: 2006-03-23
// Auth: Piotr Borys
//
// +AM2 +A0.3 +R2 +FN +UA
//
#version 3.6;
#include "functions.inc"
#include "rad_def.inc"
#declare Photons = off;
#declare Radiosity = on;
#declare Glass = off;
global_settings {
max_trace_level 16
#if (Radiosity)
radiosity {
Rad_Settings(Radiosity_Normal, off, off)
}
#end
#if (Photons)
photons {
spacing 0.01
autostop 0
}
#end
}
// --------------------------------------------------------------------
camera {
right x*image_width/image_height
location <0.6, 1, -1>*5
look_at <-0.25, 0.2, 0>
angle 50
}
light_source {
<8, 16, -4>
color rgb 1.2
spotlight
radius 50
falloff 70
tightness 10
point_at <0, 0, 0>
area_light
<1.8, 0, 0> <0, 0, 1.8>
6, 6
adaptive 1
#if (Photons)
photons {
refraction on
reflection on
}
#end
}
light_source {
<-10, 2, -10>
color <0.7, 0.8, 0.9>*0.5
}
// --------------------------------------------------------------------
sphere {
<0, 0, 0> 20
texture {
pigment {
image_map {
jpeg "../lighting/lighting-04.jpg"
map_type 1
}
}
finish {
ambient 0.3
diffuse 0.9
specular 0.0
roughness 0.01
}
}
#if (Photons)
photons {
collect off
}
#end
hollow
}
plane {
y, 0
texture {
pigment {
color rgb <0.7, 0.8, 0.9>
}
finish {
ambient 0.1
diffuse 0.7
specular 0.15
roughness 0.001
}
}
}
// --------------------------------------------------------------------
#declare T_Chrome =
texture {
pigment { rgb <0.2, 0.2, 0.2> }
finish {
metallic
ambient 0.1
diffuse 0.6
specular 0.9
roughness 0.01
reflection {
0.35, 1.0
fresnel on
}
conserve_energy
brilliance 1.5
}
}
#declare T_Glass =
texture {
pigment {rgbt 1}
finish {
ambient 0.0
diffuse 0.0
specular 0.8
roughness 0.0005
reflection {
0.4, 1.0
fresnel on
}
conserve_energy
}
}
#declare I_Glass =
interior {
ior 1.5
fade_power 8
fade_distance 0.02
fade_color <0.7, 0.8, 0.9>
}
#declare M_RGlass =
material {
texture { T_Glass }
interior {
I_Glass
fade_color <1.0, 0.0, 0.0>
}
}
#declare M_GGlass =
material {
texture { T_Glass }
interior {
I_Glass
fade_color <0.0, 1.0, 0.0>
}
}
#declare M_BGlass =
material {
texture { T_Glass }
interior {
I_Glass
fade_color <0.0, 0.0, 1.0>
}
}
#declare M_YGlass =
material {
texture { T_Glass }
interior {
I_Glass
fade_color <1.0, 1.0, 0.0>
}
}
// --------------------------------------------------------------------
#declare Thickness = 0.07;
#declare WaveHeight = 0.15;
#declare Roundness = 0.1;
#declare wave_box =
isosurface {
function { f_rounded_box(x, (y - sin(x*pi)*WaveHeight), z,
Roundness, 1, Thickness, 1) }
contained_by { box { <-1,-0.5,-1>, < 1, 0.5, 1> } }
max_gradient 1.1
}
isosurface {
wave_box
#if (Glass)
material { M_YGlass }
#else
texture {
T_Chrome
pigment { rgb <0.5, 0.5, 0.0> }
}
#end
#if (Photons)
photons {
target
reflection on
refraction on
//collect off
}
#end
translate <1.1, 1.0, -1.1>
}
isosurface {
wave_box
#if (Glass)
material { M_BGlass }
#else
texture {
T_Chrome
pigment { rgb <0.0, 0.0, 0.5> }
}
#end
#if (Photons)
photons {
target
reflection on
refraction on
//collect off
}
#end
translate <-1.1, 1.0, -1.1>
}
isosurface {
wave_box
#if (Glass)
material { M_GGlass }
#else
texture {
T_Chrome
pigment { rgb <0.0, 0.5, 0.0> }
}
#end
#if (Photons)
photons {
target
reflection on
refraction on
//collect off
}
#end
translate <1.1, 1.0, 1.1>
}
isosurface {
wave_box
#if (Glass)
material { M_RGlass }
#else
texture {
T_Chrome
pigment { rgb <0.5, 0.0, 0.0> }
}
#end
#if (Photons)
photons {
target
reflection on
refraction on
//collect off
}
#end
translate <-1.1, 1.0, 1.1>
}
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Hi Bob,
> Gave it to POV-Ray here to render and I only saw a 3X change in render times
> for the chrome and glass. I'm not sure what to suggest then, because that
> seems about right for glass objects.
Huh?... hmm, my Athlon64 3000+ chokes on this... will have to
investigate that.
> Something I wanted to point out about your global_settings is that you
> aren't using assumed_gamma, something that has often been discussed in the
> past, so you might want to check into that. Using assumed_gamma 1 is said to
> be correct (unlike version 3.7 beta where that has now changed).
I was always adding assumed_gamma, but this time I was rendering it with
3.7 beta :)
> And for radiosity it is common practice to use ambient_light 0 to squelch
> the effect of ambience and apply to the diffuse of textures.
Och, I forgot that... I'm using radiosity for a short period of time.
Indeed, it'd be better.
> One other thing I noticed, your chrome has fresnel reflection but that's
> applied based on ior (refraction), yet it hasn't any refraction; although,
> you may add that if you wish.
O, have to check it out... :) thanks!
--
cheers,
Piotr
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com> wrote: