On 13-5-2016 11:43, Simon J. Cambridge wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 10-5-2016 13:37, William F Pokorny wrote:
>>> On 05/10/2016 02:54 AM, Thomas de Groot wrote:
>>>> On 10-5-2016 1:20, Kenneth wrote:
>>>>> "Kenneth" <kdw### [at] gmailcom> wrote:
>>>>>> The strands utility definitely looks interesting.
>>>>>
>>>>> Oops, I found it in the newsgroups, in binaries.utilities (September
>>>>> 2010)
>>>>>
>>>>>
>>>>>
>>>> I could not have been more precise. I picked them up at the moment when
>>>> Sam made them available and did not really note down a location, except
>>>> for the date.
>>>>
>>>> According to my info, rockhead1.pov dates back to 2007. I think there
>>>> was an image, so p.b.i. should be a first guess.
>>>>
>>>> There are still a lot of utilities from Sam that I have not really tried
>>>> out. I pick things up when they come by and then put them on the shelf.
>>>>
>>>
>>> If anyone - Sam? - has a pointer to the original theory or perhaps
>>> source code for the strands technique I would appreciate it. I've done
>>> some searches with the word strands, but come up empty and I don't quite
>>> see what is being done.
>>>
>>> I picked up the exe too, but it would not run under wine for me & it is
>>> an effect I would like to try.
>>>
>>> On the image, Thomas, are the floating shapes at the edges from an
>>> underlying isosurface then? The general look I like.
>>>
>>> Bill P.
>>
>> Yes the general shapes are isosurfaces. This is the (Sam-based) code for
>> the head:
>>
>> #declare rock=
>> function{
>>     pigment {
>>       //spherical //or:
>>       boxed
>>       pigment_map {
>>         [0.0 rgb 0]
>>         [0.5 pigment_pattern {
>>                image_map {
>>                  //png"rockman.png" gamma 1.0 interpolate 2
>>                  //png"TdG_rock_01.png" gamma 1.0 interpolate 2
>>                  png"t_degroot01.png" gamma 1.0 interpolate 2
>>                  //png"Sam Benge Strands/strands_003.png" gamma 1.0
>> interpolate 2
>>                }
>>                translate-(x+y)/2
>>                scale 2
>>              }
>>              pigment_map {
>>                [0.0 rgb 0]
>>                [0.5 granite
>>                     scale <5, 0.5, 5>
>>                     poly_wave 0.5
>>                     rotate z*12
>>                     color_map {
>>                       [0 rgb 0.25]
>>                       [1 rgb 0.75]
>>                     }
>>                ]
>>                [1.0 rgb 1]
>>              }
>>         ]
>>         [1.0 rgb 1]
>>       }
>>     }
>> }
>>
>> and the isosurface used:
>>
>> isosurface {
>>     function {
>>       0-rock(x,y,z).grey+0.05
>>     }
>>     accuracy 0.001
>>     max_gradient 2
>>     all_intersections
>>     contained_by {box {<-1,-1,-1>,<1,1,1>}}
>>     texture {granite_rock}
>> }
>>
>> The strands output image is used in Gimp in combination with the
>> portrait and additional layers, to get a final image.
>>
>> --
>> Thomas
>
> Thank you Thomas! More lovely toys to play with. And I love the images. Lots of
> food for thought.
>
> I really must dive through the binaries. Clearly there is a lot I have missed.

No thanks. All praise goes to Sam Benge for these tools. And yes, like 
we all, there is a lot we miss one way or another.

-- 
Thomas

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