On 31-10-2011 13:38, cartun wrote:
> hello there,
>
> i have a problem with a heigtmap:
> http://s14.directupload.net/images/111031/o8sgwpwd.png
>
> you have a idea how can I prevent something?
>

I suppose you make the height_field from an image?

You can do two things:

1) add double_illuminate to the height_field block and see if the 
artifacts disappear;

2) make the height_field from an image-related function. In this case 
you can increase the resolution as you need it. To do this use the 
following code and adapt to your needs:

#declare F_HF_01 =
function {
   pigment {
     image_map {
       tga "my_image.tga" gamma 1.0  //or any other image_map type
       map_type 0
       interpolate 2
     }
     warp {repeat x}
     warp {repeat y}
     scale 50
     warp {
       turbulence 0.2
       octaves 1 //[6]
       lambda 1  //[2]
       omega 0.2 //[0.5]
     }
     scale 1/50
   }
}

#declare hf1 =
   height_field {
     function HF_res, HF_res {F_HF_01(x,y,z).hf}
     smooth
     translate <-0.5, 0, -0.5>
   }

HF_res is the resolution you want to apply, typically this can be 2000 
or 5000 for very high resolutions, or 500 for low resolution testing.


THomas

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