>> 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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