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Hi,
I'm trying to render a scene with mac megapov in which I want the output to
be a PNG with transparency. I set the output file option by checking the
box labeled 'Add Alpha Channel', which presumably is equivalent to "+ua" on
the command line. However, I always end up with a black background, rather
than a transparent one.
Any suggestions would be appreciated.
Thanks,
Shawn
---
#version 3.5;
camera {
location <0, 0, 10>
look_at <0, 0, 0>
}
#declare cam_pos = <0, 0, 10>;
#declare dist = 1.03;
#declare thick1 = 0.05;
#declare linetex = texture {pigment {rgb 0} finish {ambient 1}}
#declare trans = transform {rotate 90*clock*y}
#macro scalepoint(center,amt)
transform {trans}
translate -center scale amt translate center
#end
#macro atom(center,rad,thick)
union {
sphere {center,rad transform {trans}}
sphere {center,(rad+thick1) texture {linetex}
scalepoint(cam_pos,dist)}
}
#end
#declare ATM_FINISH = finish {ambient rgb <1,1,1> }
#declare textgrey = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
color_map{[0.625 color rgb <.45,.45,.45>][0.626 color rgb <.5,.5,.5>]}}
finish {ATM_FINISH}}
#declare textred = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
color_map{[0.625 color rgb <.8,0,0>][0.626 color rgb <.95,0,0>]}} finish
{ATM_FINISH}}
#declare textgreen = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
color_map{[0.625 color rgb <0,.8,0>][0.626 color rgb <0,.95,0>]}} finish
{ATM_FINISH}}
#declare textblue = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
color_map{[0.625 color rgb <0,0,.8>][0.626 color rgb <0,0,.95>]}} finish
{ATM_FINISH}}
background { color rgb <10,10,10> }
fog {
fog_type 2
distance 4
color rgbt <0,0,0,.1>
fog_offset 1
fog_alt .0001
up <0,0,1>
}
object {atom(<-2,-2,0> .4, thick1) texture {textgrey}}
object {atom(<-2,2,0> .4, thick1) texture {textred}}
object {atom(<2,-2,0> .4, thick1) texture {textgreen}}
object {atom(<2,2,0> .4, thick1) texture {textblue}}
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"Shawn" <nomail@nomail> wrote in message
news:web.45f398ac1ac5cb4eaf07da010@news.povray.org...
> I'm trying to render a scene with mac megapov in which I want the output
> to
> be a PNG with transparency. I set the output file option by checking the
> box labeled 'Add Alpha Channel', which presumably is equivalent to "+ua"
> on
> the command line. However, I always end up with a black background,
> rather
> than a transparent one.
>
> Any suggestions would be appreciated.
> background { color rgb <10,10,10> }
background { color rgbt <10,10,10,1> }
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Shawn nous apporta ses lumieres en ce 11-03-2007 00:50:
> Hi,
>
> I'm trying to render a scene with mac megapov in which I want the output to
> be a PNG with transparency. I set the output file option by checking the
> box labeled 'Add Alpha Channel', which presumably is equivalent to "+ua" on
> the command line. However, I always end up with a black background, rather
> than a transparent one.
>
> Any suggestions would be appreciated.
>
> Thanks,
> Shawn
>
> ---
>
> #version 3.5;
>
> camera {
> location <0, 0, 10>
> look_at <0, 0, 0>
> }
>
> #declare cam_pos = <0, 0, 10>;
> #declare dist = 1.03;
> #declare thick1 = 0.05;
> #declare linetex = texture {pigment {rgb 0} finish {ambient 1}}
> #declare trans = transform {rotate 90*clock*y}
>
> #macro scalepoint(center,amt)
> transform {trans}
> translate -center scale amt translate center
> #end
>
> #macro atom(center,rad,thick)
> union {
> sphere {center,rad transform {trans}}
> sphere {center,(rad+thick1) texture {linetex}
> scalepoint(cam_pos,dist)}
> }
> #end
>
> #declare ATM_FINISH = finish {ambient rgb <1,1,1> }
> #declare textgrey = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
> color_map{[0.625 color rgb <.45,.45,.45>][0.626 color rgb <.5,.5,.5>]}}
> finish {ATM_FINISH}}
> #declare textred = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
> color_map{[0.625 color rgb <.8,0,0>][0.626 color rgb <.95,0,0>]}} finish
> {ATM_FINISH}}
> #declare textgreen = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
> color_map{[0.625 color rgb <0,.8,0>][0.626 color rgb <0,.95,0>]}} finish
> {ATM_FINISH}}
> #declare textblue = texture {pigment {slope {vnormalize(<1000,1000,1000>)}
> color_map{[0.625 color rgb <0,0,.8>][0.626 color rgb <0,0,.95>]}} finish
> {ATM_FINISH}}
>
> background { color rgb <10,10,10> }
>
> fog {
> fog_type 2
> distance 4
> color rgbt <0,0,0,.1>
> fog_offset 1
> fog_alt .0001
> up <0,0,1>
> }
This fog let show 1/10th of the background, so you need to set the background to
10 to be able to see it.
>
> object {atom(<-2,-2,0> .4, thick1) texture {textgrey}}
> object {atom(<-2,2,0> .4, thick1) texture {textred}}
> object {atom(<2,-2,0> .4, thick1) texture {textgreen}}
> object {atom(<2,2,0> .4, thick1) texture {textblue}}
>
>
>
Check out your fog: it fades to black and given the fact that you don't have
anything behind the scene, you don't see the background, only your fog.
Solution: remove the fog. You can also remove the background directive, as it is
no longer needed.
--
Alain
-------------------------------------------------
At least I thought I was dancing, 'til somebody stepped on my hand.
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Jim Holsenback <jho### [at] hotmail com> wrote:
> background { color rgbt <10,10,10,1> }
That has nothing to do with the issue.
--
- Warp
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"Warp" <war### [at] tagpovrayorg> wrote in message
news:45f437a2@news.povray.org...
> That has nothing to do with the issue.
sheesh .... i'm batting 1.000 ..... shuttin' up now!
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Thank you for your responses! The fog was indeed the problem.
A contributer to wikipedia was kind enough to share his code for generating
some images of molecular models, e.g.:
http://en.wikipedia.org/wiki/Image:7TM4.png
http://en.wikipedia.org/wiki/Image:GPCR_mechanism.png
The fog is necessary to create the nice 3D depth effect. I suppose there is
no way to replicate this effect and also maintain transparency?
Thanks,
Shawn
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"Shawn" <nomail@nomail> wrote:
> Thank you for your responses! The fog was indeed the problem.
>
> A contributer to wikipedia was kind enough to share his code for generating
> some images of molecular models, e.g.:
>
> http://en.wikipedia.org/wiki/Image:7TM4.png
> http://en.wikipedia.org/wiki/Image:GPCR_mechanism.png
>
> The fog is necessary to create the nice 3D depth effect. I suppose there is
> no way to replicate this effect and also maintain transparency?
>
> Thanks,
> Shawn
Are you sure it's necessary? I don't discern any significant difference
between the version with and without fog. Either way, if you want fog and
transparency in the same pic, you can take advantage of POV-Ray's
"infinite". Put a big number as distance in the fog. I tried 4000000 and
40000000: the first one is still very dark, but the second might be too
light.
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> The fog is necessary to create the nice 3D depth effect. I suppose there
> is
> no way to replicate this effect and also maintain transparency?
You can use gradient color maps to create a similar effect without fog.
// Depth Cue Red
#declare DC_Red = texture {
pigment {
gradient z
color_map {
[0 color <1,0,0>]
[1 color <1,0,0>*0.05]
}
scale 2.1
translate <0,0,-0.1>
}
finish {
ambient 0.2
diffuse 1
}
};
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