I thought I'd try something different as an exercise. I want to create a
chechered sphere.
Trying to make a sphere with a checkered pigment won't give nice results. So I
thought I'd try my hand a "image_map"ing. I created an image_map (see attached
checker.png) and created a sphere with an image_map like this:

sphere{
 0,1
 pigment {
      image_map {png "checker.png"}
      scale 0.2
  }
}

What I don't get is how to make the image map wrap the entire sphere nicely.
I'd be interested to hear how you pro's do this.

-- 
-- 
M.E.J.R.Hendrix
a s o e
u t r n
r e i s
i r e
c   n
e

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Download 'checker.png' (3 KB) Download 'checkered sphere.png' (81 KB)

Preview of image 'checker.png'

Preview of image 'checkered sphere.png'

"SomeOne" <ask### [at] yahoocouknospam> wrote:
> What I don't get is how to make the image map wrap the entire sphere nicely.
> I'd be interested to hear how you pro's do this.

Try this:
sphere { 0, 1
  pigment { uv_mapping checker scale 0.1 }
}

See "uv_mapping" in POV-Ray's tutorial.

Boa Sorte !!!! (Good Luck), Wagner

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"SomeOne" <ask### [at] yahoocouknospam> wrote in message
news:40ed8c36@news.povray.org...
> I thought I'd try something different as an exercise. I want to create a
> chechered sphere.
> Trying to make a sphere with a checkered pigment won't give nice results.
So I
> thought I'd try my hand a "image_map"ing. I created an image_map (see
attached
> checker.png) and created a sphere with an image_map like this:
>
> sphere{
>  0,1
>  pigment {
>       image_map {png "checker.png"}
>       scale 0.2
>   }
> }
>
> What I don't get is how to make the image map wrap the entire sphere
nicely.
> I'd be interested to hear how you pro's do this.
>

map_type 1 ( pov help section "3.4.12.7.2  The map_type Option") should
help, such as

pigment {
 image_map {png "checker.png" }
 map_type 1
 scale 0.2
}

why didn't using the builtin checker pattern work?

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Bee-rrrrilll-iant!

Thanks!

<nomail@nomail> schreef in bericht
news:web.40ed8f9edb70ad089a7b3b070@news.povray.org...
| "SomeOne" <ask### [at] yahoocouknospam> wrote:
| > What I don't get is how to make the image map wrap the entire sphere
nicely.
| > I'd be interested to hear how you pro's do this.
|
| Try this:
| sphere { 0, 1
|   pigment { uv_mapping checker scale 0.1 }
| }
|
| See "uv_mapping" in POV-Ray's tutorial.
|
| Boa Sorte !!!! (Good Luck), Wagner
|

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SomeOne wrote:

> I thought I'd try something different as an exercise. I want to create a
> chechered sphere.
> Trying to make a sphere with a checkered pigment won't give nice results. So I
> thought I'd try my hand a "image_map"ing. I created an image_map (see attached
> checker.png) and created a sphere with an image_map like this:
> 
> sphere{
>  0,1
>  pigment {
>       image_map {png "checker.png"}
>       scale 0.2
>   }
> }
> 
> What I don't get is how to make the image map wrap the entire sphere nicely.
> I'd be interested to hear how you pro's do this.
> 
> 

This will get the checkered sphere you were looking for:

sphere{
  0,1
  pigment {

       checker rgb 0 rgb 1
       scale 0.1
       warp { spherical }
  }

Change the pigment pattern to the following to use an image map. Note 
this will stretch the entire image to the sphere. To get smaller checks, 
use smaller checks in the image map:

  image_map {png "checker.png" map_type 1}
       scale 0.2

-- 
~Mike

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"Ross" <rli### [at] everestkcnet> schreef in bericht
news:40ed906a@news.povray.org...
|
| why didn't using the builtin checker pattern work?
|

The checker pattern is a 3D pattern of blocks the sphere is made by apparantly
cutting out a sphere from a infinite box of black and white blocks in a 3D
checkered pattern. The result is shown in the attached image. The uv_mapping
option as suggested by Wagner works like a charm.

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Attachments:
Download 'checkered sphere.png' (71 KB)

Preview of image 'checkered sphere.png'