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Hi,
There still seems to be a bug (or maybe two) in the (refractive) photons
code.
It accurs only in very special cases, and is dependent on the texture and
shape of the object on wich the photons show up, on the position of the
light_source, the color of the light source, and the color and
filter/transmit of the refractive object (and maybe some other things i
didn't notice).
The symptoms are:
a) bright colored caustics, but the color is not related to the color of
light_source or photon target (of course, dispersion was not used).
b) holes/circular black spots appear in the caustics.
Here is a scene with shows the prob.
I tried to eliminate everything that seems to have no effect on the bug.
I'll also post a rendering of this scene in the beta-test.binaries group.
#version 3.5;
#include "functions.inc"
#declare overallscale=10;
#declare cm=0.01*overallscale;
#declare m=1*overallscale;
global_settings
{
assumed_gamma 2
max_trace_level 50
photons
{
count 10000 jitter .3
}
}
camera
{
location <0,30,-50>*cm
look_at <-3.5,6,0>*cm
angle 30
}
light_source
{
vnormalize(<2,2,-1>)*m*1 // multiply with .6, and the color will
go away
color rgb <1,1,.95>*2
spotlight point_at <0,10,0>*cm radius 0 falloff 15 tightness 20
}
#declare Floor=
texture
{
pigment
{
color rgb 1
}
finish
{
ambient 0
reflection .2 // remove this -> black "holes" in caustics
will go away
}
}
#declare Sky=
texture
{
pigment
{
color rgb 1
}
finish{ambient 1}
}
sphere
{
0,1*m
translate y*(1*m)
texture
{
gradient y scale 2*m
texture_map
{
[0.0 Floor]
[0.1 Floor]
[0.3 Sky]
[1.0 Sky]
}
}
translate -y*0.01*cm
inverse
//clipped_by{plane{y,.02*m }}
}
lathe
{
//linear_spline
cubic_spline
6+2+2+1,
< -0.5, 0.1>*cm,
< 0.0, 0.1>*cm,
< 4.0, 0.0>*cm,
< 4.75, 0.5>*cm,
< 4.0, 3.0>*cm,
< 5.0, 10.0>*cm,
< 5.0, 11.5>*cm,
< 4.5, 10.0>*cm,
< 3.2, 1.5>*cm,
< 0.0, 1.5>*cm
< -0.5, 1.5>*cm
// avoid coicidence probs
translate y*.1*cm
pigment
{
color rgb <.99,1,.99>
filter .9
}
interior
{
ior 1.5
}
photons{target refraction on reflection on collect off}
}
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Below is an updated script that seems to work with your original settings. I
added photons to the reflective sphere and also added caustics to the glass.
This made a nice picture as far as I can see.
Dean
#version 3.5;
#include "functions.inc"
#declare overallscale=10;
#declare cm=0.01*overallscale;
#declare m=1*overallscale;
global_settings
{
assumed_gamma 2
max_trace_level 50
photons
{
count 10000 //jitter .3
}
}
camera
{
location <0,30,-50>*cm
look_at <-3.5,6,0>*cm
angle 30
}
light_source
{
vnormalize(<2,2,-1>)*m*1 // multiply with .6, and the color will go
away
color rgb <1,1,.95>*1
spotlight point_at <0,10,0>*cm radius 0 falloff 15 tightness 20
}
#declare Floor=
texture
{
pigment
{
color rgb 1
}
finish
{
ambient 0
reflection .2 // remove this -> black "holes" in caustics
will go away
}
}
#declare Sky=
texture
{
pigment
{
color rgb 1
}
finish{ambient 1}
}
sphere
{
0,1*m
translate y*(1*m)
texture
{
gradient y scale 2*m
texture_map
{
[0.0 Floor]
[0.1 Floor]
[0.3 Sky]
[1.0 Sky]
}
}
translate -y*0.01*cm
inverse
//clipped_by{plane{y,.02*m }}
photons{target refraction on reflection on collect off}} //added by Dean to
see if how it changes things
lathe
{
//linear_spline
cubic_spline
6+2+2+1,
< -0.5, 0.1>*cm,
< 0.0, 0.1>*cm,
< 4.0, 0.0>*cm,
< 4.75, 0.5>*cm,
< 4.0, 3.0>*cm,
< 5.0, 10.0>*cm,
< 5.0, 11.5>*cm,
< 4.5, 10.0>*cm,
< 3.2, 1.5>*cm,
< 0.0, 1.5>*cm
< -0.5, 1.5>*cm
// avoid coicidence probs
translate y*.1*cm
pigment
{
color rgb <.99,1,.99>
filter .9
}
interior
{
ior 1.5
caustics .5//added by Dean to see if how it changes things
}
photons{target refraction on reflection on collect off}
}
Lutz-Peter Hooge wrote:
> Hi,
>
> There still seems to be a bug (or maybe two) in the (refractive) photons
> code.
> It accurs only in very special cases, and is dependent on the texture and
> shape of the object on wich the photons show up, on the position of the
> light_source, the color of the light source, and the color and
> filter/transmit of the refractive object (and maybe some other things i
> didn't notice).
>
> The symptoms are:
> a) bright colored caustics, but the color is not related to the color of
> light_source or photon target (of course, dispersion was not used).
> b) holes/circular black spots appear in the caustics.
>
> Here is a scene with shows the prob.
> I tried to eliminate everything that seems to have no effect on the bug.
> I'll also post a rendering of this scene in the beta-test.binaries group.
>
> #version 3.5;
> #include "functions.inc"
>
> #declare overallscale=10;
> #declare cm=0.01*overallscale;
> #declare m=1*overallscale;
>
> global_settings
> {
> assumed_gamma 2
> max_trace_level 50
> photons
> {
> count 10000 jitter .3
> }
> }
>
> camera
> {
> location <0,30,-50>*cm
> look_at <-3.5,6,0>*cm
> angle 30
> }
>
> light_source
> {
> vnormalize(<2,2,-1>)*m*1 // multiply with .6, and the color will
> go away
> color rgb <1,1,.95>*2
> spotlight point_at <0,10,0>*cm radius 0 falloff 15 tightness 20
> }
>
> #declare Floor=
> texture
> {
> pigment
> {
> color rgb 1
> }
> finish
> {
> ambient 0
> reflection .2 // remove this -> black "holes" in caustics
> will go away
> }
> }
>
> #declare Sky=
> texture
> {
> pigment
> {
> color rgb 1
> }
> finish{ambient 1}
> }
>
> sphere
> {
> 0,1*m
> translate y*(1*m)
> texture
> {
> gradient y scale 2*m
> texture_map
> {
> [0.0 Floor]
> [0.1 Floor]
> [0.3 Sky]
> [1.0 Sky]
> }
>
> }
> translate -y*0.01*cm
> inverse
> //clipped_by{plane{y,.02*m }}
> }
>
> lathe
> {
> //linear_spline
> cubic_spline
> 6+2+2+1,
>
> < -0.5, 0.1>*cm,
>
> < 0.0, 0.1>*cm,
> < 4.0, 0.0>*cm,
>
> < 4.75, 0.5>*cm,
>
> < 4.0, 3.0>*cm,
> < 5.0, 10.0>*cm,
> < 5.0, 11.5>*cm,
> < 4.5, 10.0>*cm,
>
> < 3.2, 1.5>*cm,
>
> < 0.0, 1.5>*cm
>
> < -0.5, 1.5>*cm
>
> // avoid coicidence probs
> translate y*.1*cm
>
> pigment
> {
> color rgb <.99,1,.99>
> filter .9
> }
> interior
> {
> ior 1.5
> }
> photons{target refraction on reflection on collect off}
> }
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