water care of Danbo, thanx Dan

jpg lowest compression setting removed 200 kb versus png

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dont think I got the hang of it yet

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"alphaQuad" <alp### [at] earthlinknet> wrote:
> dont think I got the hang of it yet


here's a curiosity: what can POV do?

what about a half moon in the middle of the day?

night time sky is behind the moon and black. you might be able to
air brush the map to black. yuck

day time sky would eliminate that possibility being actually in back of moon.
airbrushing to a gradient sky would be difficult at best.

so can POV do either suggestion without touching the map.

half moon night
or half moon day

day time moon would darken at half point then go transparent.

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I didnt use light angle on previous. I see night time half moon would be a
sinch.

but day time half moon boggles; needing to go transparent? or what.

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alphaQuad napsal(a):
> "alphaQuad" <alp### [at] earthlinknet> wrote:
>> dont think I got the hang of it yet
> 
> 
> here's a curiosity: what can POV do?
> 
> what about a half moon in the middle of the day?
> 
> night time sky is behind the moon and black. you might be able to
> air brush the map to black. yuck
> 
> day time sky would eliminate that possibility being actually in back of moon.
> airbrushing to a gradient sky would be difficult at best.
> 
> so can POV do either suggestion without touching the map.
> 
> half moon night
> or half moon day
> 
> day time moon would darken at half point then go transparent.
> 
three layers:
moon (prerendered)
occlusion (probably grouped with the moon)
sky (transparent)

or:
moon (sphere)
an actual atmosphere (not as slow as you might think)

the first variant is probably easier to do.

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translating the moon out further produces a horizontal straight line of
reflection at the edge of the water. this part of the reflection would not be
seen because it is too far away on the horizon. here the moon isnot farther
than the edge of the water for that reason.

day time half moon seems to elude me at this point

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Jan Dvorak <jan### [at] centrumcz> wrote:
> three layers:
> moon (prerendered)
> occlusion (probably grouped with the moon)
> sky (transparent)
> or:
> moon (sphere)
> an actual atmosphere (not as slow as you might think)
>
> the first variant is probably easier to do.


pre-rendered? that draws a blank.

it seems the right way, is to do the moon as seen here,
only with a cloud atmosphere between it and camera.

need more info on:
sky (transparent)
pre-rendered




I was able to remember vicky's hair and did this.

#declare p_map1=pigment {image_map{jpeg "moon" interpolate 2 transmit all 0
filter all 0} }
#declare p_map2=pigment {image_map{png "moontr" interpolate 2 }}

#declare halfmoon = texture{ pigment{ p_map1} }

#declare half_moon =  material {
texture { pigment_pattern{ p_map2}
texture_map { [ 0 pigment{Clear} ]
             [  1 halfmoon       ]
           }
     }

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"alphaQuad" <alp### [at] earthlinknet> schreef in bericht 
news:web.472e20902a06dfe95b922c2d0@news.povray.org...
> "alphaQuad" <alp### [at] earthlinknet> wrote:
>> dont think I got the hang of it yet
>
>
> here's a curiosity: what can POV do?
>
> what about a half moon in the middle of the day?
>

This has been solved very nicely by Bill Pragnell (look for a message  dated 
november 23, 2005, I think in this same ng) and I have used the trick in 
several of my scenes. I took some notes which I reproduce here:

1) use a hollow sphere around your scene (or use inverse) set background to 
black
2) give it the required color gradient you would give a sky_sphere, but use 
a partial transparency, ambient 1, diffuse 0
3) put the moon and the light source (sun) outside of this sphere: the parts 
in shadow will have the same color as the local sky
4) if you want to use radiosity: use an interior_texture on your sphere. The 
ouside texture should be rgb 0, with transmit=1

note 1: you may have to experiment a bit with the transparency and/or the 
gradient colors to get the desired effect.
note 2: instead of a sphere, you can use other objects of course: a plane or 
a cube or whatever.

Hope this helps

Thomas

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alphaQuad nous apporta ses lumieres en ce 2007/11/04 14:42:
> "alphaQuad" <alp### [at] earthlinknet> wrote:
>> dont think I got the hang of it yet
> 
> 
> here's a curiosity: what can POV do?
> 
> what about a half moon in the middle of the day?
> 
> night time sky is behind the moon and black. you might be able to
> air brush the map to black. yuck
> 
> day time sky would eliminate that possibility being actually in back of moon.
> airbrushing to a gradient sky would be difficult at best.
> 
> so can POV do either suggestion without touching the map.
> 
> half moon night
> or half moon day
> 
> day time moon would darken at half point then go transparent.
>
Half and cressent moon at night:
- use a sphere with the image_map of the moon surface, light it sideway, make it 
part of a light_group.
- Use an image of a cressent or half moon where the dark part of the moon is NOT 
transparent.
Both cases, use a sky_sphere for your stary background.

Day time:
- Two "world spheres", one with the moon, the second, slightly smaller, 
sky-blue, filtering, with whatever gradiant and clouds you may want.
- Use an actual sphere with moon image behind your athmosphere, done whatever 
way you want.

-- 
Alain
-------------------------------------------------
One tequila, two tequila, three tequila, floor.

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alphaQuad nous apporta ses lumieres en ce 2007/11/04 17:48:
> Jan Dvorak <jan### [at] centrumcz> wrote:
>> three layers:
>> moon (prerendered)
>> occlusion (probably grouped with the moon)
>> sky (transparent)
>> or:
>> moon (sphere)
>> an actual atmosphere (not as slow as you might think)
>>
>> the first variant is probably easier to do.
> 
> 
> pre-rendered? that draws a blank.
Pre-render:
Render the complete moon only lighted from the side with alpha chanel on: +ua.
Then use the result in the final render.
This ensure that the dark side of your moon won't let you see the stars behind it.
> 
> it seems the right way, is to do the moon as seen here,
> only with a cloud atmosphere between it and camera.
> 
> need more info on:
> sky (transparent)
> pre-rendered
> 
> 
> 
> 
> I was able to remember vicky's hair and did this.
> 
> #declare p_map1=pigment {image_map{jpeg "moon" interpolate 2 transmit all 0
> filter all 0} }
> #declare p_map2=pigment {image_map{png "moontr" interpolate 2 }}
> 
> #declare halfmoon = texture{ pigment{ p_map1} }
> 
> #declare half_moon =  material {
> texture { pigment_pattern{ p_map2}
> texture_map { [ 0 pigment{Clear} ]
>              [  1 halfmoon       ]
>            }
>      }
> 
> 
> ------------------------------------------------------------------------
> 
You used a sky_sphere, so the moon is before your "clouds".
You should use a large, filtering or transmiting sphere for your sky. Then place 
your moon outside of it. Set the background to some gray or bluish gray.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you look at a matrix transform and 
know instantly what it does.
John VanSickle

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