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Can somebody tell why is sphere in light_source, looks_like black?
#include "shapes.inc"
#include "colors.inc"
#include "textures.inc"
#global_settings {ambient_light Yellow}
#declare FRONT_TEXTURE = texture {
pigment {
color red 0.439215 green 0.847058 blue 0.407843
}
finish {
ambient 0.5
diffuse 0.4}
}
#declare BACK_TEXTURE = texture {
pigment {
color red 0.980392 green 0.862745 blue 0.415686
}
finish {
ambient 0.8
diffuse 0.6
phong 0.5
phong_size 1
}
}
#include "Mesh.inc"
//Plane
plane { y,-2800
pigment {
checker color red 0.99 green 0.1 blue 0.070588 color red 0.121568 green
0.558823 blue 0.19607
scale 1600
}
finish {
ambient 0.2
diffuse 0.9
phong 0.9
phong_size 100
}
}
plane { -z, 12500
pigment {
checker color red 0.99 green 0.1 blue 0.070588 color red 0.121568 green
0.558823 blue 0.19607
scale 1600
}
finish { ambient 0.1 diffuse 0.6 }
}
//camera
camera {
angle 59
location <-200.0, 300.0, 590.0>
right <1, 0.0, 0.0>
up <0., 1, -0.5>
rotate <-4,-11,0>
direction <0.35, -0.5, -1.0>
}
#declare svjetlo = sphere {
<10.5, 10, 0>, 80
pigment {
color White
translate <1.5, 0, 0>
}
}
// Light source
light_source {
<-280,180,-400>
color White
looks_like {
sphere
{ <-0,0,-0>,20
//color White
finish {
ambient -0.9
diffuse 0.9
phong 1
}
}
}
translate <-10,150,700>
}
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Kokni_me <nomail@nomail> wrote:
> Can somebody tell why is sphere in light_source, looks_like black?
Because nothing is illuminating it and its ambient is negative. (Well,
technically speaking something *is* illuminating: The light source in
question. The problem is that it's illuminating it from the inside, not
the outside.)
The easiest way to make it fully white is to specify "ambient 1" in
the sphere's finish.
--
- Warp
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Yeah, that helped. And could You tell me, how can I make it blurry, so that I
have more realistic source of light?
Warp <war### [at] tag povrayorg> wrote:
> Kokni_me <nomail@nomail> wrote:
> > Can somebody tell why is sphere in light_source, looks_like black?
>
> Because nothing is illuminating it and its ambient is negative. (Well,
> technically speaking something *is* illuminating: The light source in
> question. The problem is that it's illuminating it from the inside, not
> the outside.)
>
> The easiest way to make it fully white is to specify "ambient 1" in
> the sphere's finish.
>
> --
> - Warp
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I want it to look something like this:
http://imageshack.us/photo/my-images/856/povrayslika1.jpg/
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Kokni_me <nomail@nomail> wrote:
> Yeah, that helped. And could You tell me, how can I make it blurry, so that I
> have more realistic source of light?
You have two options, one "proper", and another using a trick.
1) The "proper" way to do that is to make the sphere completely transparent
(by making its pigment be "transmit 1") and then add a spherical emitting
media inside it. (Remember to use the keyword 'hollow' in the sphere or
else the media won't show up.)
2) The easier and faster way is to use a trick: Make the sphere completely
transparent (with "transmit 1") like above, but instead of adding a media
to it, add "specular 1" to its finish. (You can fine-tune the brightness
and size of the apparent "halo" produced this way by changing that 1 to
something else as well as specifying different values of "roughness".
Start with "roughness 0.01".)
I recommend trying the second method first, as it will probably suit
your needs.
--
- Warp
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Warp <war### [at] tagpovrayorg> wrote:
> 2) The easier and faster way is to use a trick: Make the sphere completely
> transparent (with "transmit 1") like above, but instead of adding a media
> to it, add "specular 1" to its finish. (You can fine-tune the brightness
> and size of the apparent "halo" produced this way by changing that 1 to
> something else as well as specifying different values of "roughness".
> Start with "roughness 0.01".)
Btw, this has the downside that now other lights will shine on this
transparent sphere as well. You can fix that problem by using light groups
(http://wiki.povray.org/content/Reference:Light_Group)
--
- Warp
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Am 25.05.2012 13:51, schrieb Warp:
> Kokni_me<nomail@nomail> wrote:
>> Yeah, that helped. And could You tell me, how can I make it blurry, so that I
>> have more realistic source of light?
>
> You have two options, one "proper", and another using a trick.
>
> 1) The "proper" way to do that is to make the sphere completely transparent
> (by making its pigment be "transmit 1") and then add a spherical emitting
> media inside it. (Remember to use the keyword 'hollow' in the sphere or
> else the media won't show up.)
With this approach, make sure to explicitly specify "specular 0".
> 2) The easier and faster way is to use a trick: Make the sphere completely
> transparent (with "transmit 1") like above, but instead of adding a media
> to it, add "specular 1" to its finish. (You can fine-tune the brightness
> and size of the apparent "halo" produced this way by changing that 1 to
> something else as well as specifying different values of "roughness".
> Start with "roughness 0.01".)
or, 3) If you're using POV-Ray 3.7, you can make use of the "aoi"
pattern to blend between rgbt <1,1,1,1> and rgbt <1,1,1,0>.
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> I want it to look something like this:
> http://imageshack.us/photo/my-images/856/povrayslika1.jpg/
>
>
In that image, you don't see the light_source at all, but the highlight
they cause.
The sources are well out of view of the camera and there are no
reflective surface.
In POV_Ray, there are 2 models of highlight: specular and phong
To turn it on, you simply add in the finish of the objects that are to
show them:
(this renders fast)
phong [value] phong_size [value]
(use large phong_size to make smaller highlight)
or
specular [value] roughness [value]
(use small roughness to make the highlight smaller)
(this can be quite slow)
Another option is to use blured reflection, but it can greatly increase
the render time, especialy if you have inter-reflections of surfaces
using blured reflection...
Can be aleviated using 2 instances of the objects, one been
no_reflection having the blured reflection and one with no_image having
only regular reflection.
If you do see the light_source, then the propositions from Warp are good
ones.
(this can be VERY slow)
You can also put some scattering media filling your scene, the best one
been probably scattering type 3.
This will greatly affect your rendering time.
Alain
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