This week end, I tried PRMan and did my first shaders. Here are some of
the results:
- something like fur
- rust: this one, is not a full texture, it is only a layer so I can add

rust on every object I want. I didn't had a sample so, I'm not sure
about colours.
- a pattern

(the pics are scaled down so, there is a little loss on the details)

          David

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Attachments:
Download 'test00 01-2.jpg' (20 KB) Download 'test00 02-2.jpg' (30 KB) Download 'test00 03-2.jpg' (21 KB)

Preview of image 'test00 01-2.jpg'

Preview of image 'test00 02-2.jpg'

Preview of image 'test00 03-2.jpg'

I would like to see images that are not easy to make without the patch.


#version Unofficial MegaPov 0.6;

#declare Texture = 3;

#switch(Texture)
  #case(1)
    #declare FurKindOf =
      texture
      { pigment
        { bozo color_map
          { [0 rgb .2][.25 rgb <.3,.3,.2>]
            [.75 rgb <.7,.7,.2>][1 rgb <.8,.8,.2>]
          }
          scale .4
          turbulence .2
        }
        finish { crand .15 }
      }

    sphere { 0,1.2 texture { FurKindOf } }
  #break
  
  #case(2)
    #declare Rust =
      texture
      { pigment
        { bumps color_map
          { [0 rgbt 1][.6 rgbt 1]
            [.6 rgb <1,.4,.2>][.9 rgb <.9,.7,.3>]
          }
          turbulence 1
          scale .3
        }
        normal { bumps .5 scale .02 }
      }

    #declare Rad=.2;
    #declare Loc=1.2-Rad;
    union
    { cylinder { <-Loc,-Loc,-Loc>,<-Loc,-Loc, Loc>,Rad }
      cylinder { < Loc,-Loc,-Loc>,< Loc,-Loc, Loc>,Rad }
      cylinder { <-Loc, Loc,-Loc>,<-Loc, Loc, Loc>,Rad }
      cylinder { < Loc, Loc,-Loc>,< Loc, Loc, Loc>,Rad }
      cylinder { <-Loc,-Loc,-Loc>,< Loc,-Loc,-Loc>,Rad }
      cylinder { <-Loc, Loc,-Loc>,< Loc, Loc,-Loc>,Rad }
      cylinder { <-Loc,-Loc, Loc>,< Loc,-Loc, Loc>,Rad }
      cylinder { <-Loc, Loc, Loc>,< Loc, Loc, Loc>,Rad }
      cylinder { <-Loc,-Loc,-Loc>,<-Loc, Loc,-Loc>,Rad }
      cylinder { <-Loc,-Loc, Loc>,<-Loc, Loc, Loc>,Rad }
      cylinder { < Loc,-Loc,-Loc>,< Loc, Loc,-Loc>,Rad }
      cylinder { < Loc,-Loc, Loc>,< Loc, Loc, Loc>,Rad }
      sphere { <-Loc,-Loc,-Loc>,Rad }
      sphere { <-Loc,-Loc, Loc>,Rad }
      sphere { <-Loc, Loc,-Loc>,Rad }
      sphere { <-Loc, Loc, Loc>,Rad }
      sphere { < Loc,-Loc,-Loc>,Rad }
      sphere { < Loc,-Loc, Loc>,Rad }
      sphere { < Loc, Loc,-Loc>,Rad }
      sphere { < Loc, Loc, Loc>,Rad }

      texture { pigment { rgb 0 } finish { reflection .4 } }
      texture { Rust }
    }
  #break
  
  #case(3)
    #declare ZigZagFunc =
      function { if(((abs((x+1000)%2.5-1.4)-.5)%1)*4-((y+1000)%1.2), 0, 1) }
    #declare ZigZag =
      pigment
      { function { ZigZagFunc(atan2(x,z)*15/pi,y,z) }
        color_map { [0 rgb z][1 rgb x] }
      }
    
    sphere { 0,1.2 pigment { ZigZag scale .3 } }
  #break
#end

camera { location <0,1,-8>*.9 look_at 0 angle 35 }
light_source
{ <10,20,-25>*2, 1
  spotlight point_at 0 radius 20 falloff 30
  area_light x*15,y*15,10,10 adaptive 2 orient
}
plane { y,-1.2 pigment { rgb 1 } }

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Attachments:
Download 'pic1.jpg' (14 KB) Download 'pic2.jpg' (24 KB) Download 'pic3.jpg' (21 KB)

Preview of image 'pic1.jpg'

Preview of image 'pic2.jpg'

Preview of image 'pic3.jpg'

Nice !
I am sure it is possible to do the same thing with standard POV scene (your
images are close to those I did).
But the challenge was not to make THESE images but to do them WITH the patch !
And, it was my first two days of play with POVMan !

I think, there will be more complicated scenes in the future...if I have time...

            David

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Warp wrote:
> 
>   I would like to see images that are not easy to make without the patch.
> 
Well, in this case eat this ;-)

Actually, what me likes in shaders is the reuse factor: there is large
number of shaders available and one can easily adapt one for own
purposes. For creating this picture I needed perhaps 30 minutes
(creating mesh for apple, then downloading shader source and modifying
it a little bit, then scratching my head "why the lighting functions do
not work??" for couple of minutes, then inverting normal direction in
shader to get it work, then rendering it and tinkering with it a little
bit more and then adding parquet shader for plane and tinkering with it
a little bit  and then writing this article.)
Of course one can do such picture with pure POV-Ray as well...

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Attachments:
Download 'apple.jpg' (14 KB)

Preview of image 'apple.jpg'

Vahur Krouverk wrote:

> Of course one can do such picture with pure POV-Ray as well...

There's already one (don't remember if it's pure POV or MegaPOV...).
See APPLE.ZIP and fruitas.jpg on Jaime Vives Piqueres' site:
http://www.ctav.es/jaime/

Bouf.

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