Hi Hugh and Warp,

Thanks for your help. The render options Warp provided (+a0.0 +am2), did
indeed resolve the moire pattern problem completely (at the cost of a long
render time).



"wich" <wich_@no-spam-hotmail.com> wrote in message
news:3d52e713@news.povray.org...
> Hi,
>
> I have a problem with Moire effects with usign a texture with a fine
> vertical striping (simulating a trapeziod shaped vertical cladding).
>
> Any method to prevent this ugly Moire effects (see sample input)?
>
> Here is a photo that shows what I approximaty want to achieve with my
Povray
> model:
> http://www.priclad.nl/images/wallnikeklein.jpg
>
> (the photo has a horizontal cladding, whilst my model has a vertical
> cladding)
>
> Any suggestions are very welcome!
>
>
> // Moire problem
>
>
> global_settings { assumed_gamma 1.6}     // 2.2
>
> #include "shapes.inc"
> #include "colors.inc"
> #include "textures.inc"
>
>
>
>
> #declare distance_view=
>
> camera{location <100, 12, 70>
>    direction <0.0, 0.0, 1.0>
>    up  <0.0, 1.0, 0.0>
>    right <4/3, 0.0, 0.0>
>  look_at <15, 3, 30>  }
>
>
> camera {distance_view}
>
> light_source {<200.0, 200.0, -150.0> colour red 1 green 1 blue 1 }
>
>
>
>
>
>
> plane { y, 0
> texture {pigment {color red .7 green .7 blue .7}
>  finish {
>     ambient 0.5
>     diffuse 0.5
>     phong 0.75
>     phong_size 25
>
>   }  }   }
>
>
>
> union{
> box{ <0, 0, 0>  <10,  15, 60> }
> box{ <0, 0, 0>  <10,  7, 60>  translate <75, 0, 10>}
> //                                                    ___     ___
> // texture simulating trapeziod vertical cladding ___/   \___/   \___
> //
>
>  texture{
>    pigment{
>      gradient z  color_map{
>      [0.    red 172/255     green 182/255     blue 184/255]
>      [0.24  red 172/255     green 182/255     blue 184/255]
>      [0.242 red 172/255*1.2 green 182/255*1.2 blue 184/255*1.2]
>      [0.48  red 172/255*1.2 green 182/255*1.2 blue 184/255*1.2]
>      [0.482 red 172/255     green 182/255     blue 184/255]
>      [0.76  red 172/255     green 182/255     blue 184/255]
>      [0.762 red 172/255*0.8 green 182/255*0.8 blue 184/255*0.8]
>      [1.0   red 172/255*0.8 green 182/255*0.8 blue 184/255*0.8]}     scale
> 0.24
>    }
>
>   finish {
>     ambient 0.5
>     diffuse 0.5
>     phong 0.75
>     phong_size 25
>
>   }  }
> }
>
>
>
>

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