Great! Thank you for your help. What is not also clear to me from the
documentation: Which surface is being imaged? Is it the surface with corner
<-5,-5,-1> or the surface with corner <-5,-5,0>?

So, if a translation of <0,0,10> is applied to the isosurface, is the plane now
at <0,0,9> or <0,0,10>?

Is scaling the isosurface the same? For example, if I apply a scale 10, the
corner coordinates are now at <-50,-50,-10> and <-50,-50,0>?

So:

isosurface {

  function { z + f_noise3d(x, y, 0) }
// Surface now in it's desired orientation

// use this if you want smaller bumps
// #declare Bump_Size = 10;
// function{z+ f_noise3d(x*Bump_Size, y*Bump_Size, 0)/Bump_Size) }

  contained_by { box { <-5,-5,-1>, <5,5,0> } }
// Tight container = faster rendering

  accuracy 0.1
  max_gradient 1.1 //adjust if needed but should be OK
  open
   pigment {
    image_map {
     png filename
     map_type 0
     interpolate 2
translate <-0.5, -0.5, 0>// center the image
scale 10 // scale it to fit the isosurface
//    once
// no longer needed as the image now cover the whole isosurface
    }

   }
  scale 1 // --->Scale 10 changes corners to <-50,-50,-10> and <-50,-50,0>?
  //rotate<0,90,0>
// As the isosurface is now created parallel to the
// X-Y plane, you don't need to rotate it.

  translate<0,0,10> //--->is the isosurface plane imaged now at <0,0,9> or 10?

}


Alain <kua### [at] videotronca> wrote:


> >> I require a planar surface that truly has a rough surface. So my idea
> >> is to
> >> implement an isosurface and use the function f_noise3d() as in the
> >> documentation
> >> here: http://www.povray.org/documentation/view/3.6.1/73/#l27
> >>
> >> However, I also need to map the rough plane with an image. Whenever I
> >> try to use
> >> image_map with map_type 0 (plane-map), the object disappears
> >> completely but with
> >> map_type 1 (sphere-map), the plane is mapped with a spherical mapping
> >> and I can
> >> still see the object. But I do not want a sphere mapping. Any thoughts
> >> on how to
> >> achieve a plane mapping onto an isosurface?
> >>
> >> I have tried adjusting the accuracy and max_gradient as in the
> >> documentation
> >> here: http://www.povray.org/documentation/view/3.6.1/157/. However,
> >> this does
> >> not help.
> >>
> >> #include "colors.inc"
> >> #include "functions.inc"
> >>
> >> #declare filename = concat("myfile.png")
> >>
> >> isosurface {
> >>
> >>   function { x + f_noise3d(0, y, z) }
> >>   contained_by { box { <-5,-5,-5>, <5,5,5> } }
> >>   accuracy 0.1 //adjust?
> >>   max_gradient 1.1 //adjust?
> >>   open
> >>    pigment {
> >>     image_map {
> >>      png filename
> >>      map_type 0 //changing to 1 allows me to see object but with
> >> spherical
> >> mapping
> >>      interpolate 2
> >>      once
> >>     }
> >>
> >>    }
> >>   scale 1
> >>   rotate<0,90,0>
> >>   translate<0,0,10>
> >>
> >> }
> >>
> >> light_source { <0, 0, 0> color White}
> >>
> >>
> >>
> >
> > Your image only cover a 1 by 1 square, and with once, the rest is
> > apparently getting a totaly transparent pigment.
> >
> Also, the image is actualy situated just above the highest points of the
> surface.

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