I mentioned in p.o.t (Re: Need to put a picture here) that I was making 
an animation to reproduce something I read in a book many years ago. A 
woman was wearing a dress to a party. The material became transparent in 
random patches.

The latest WIP is here. (Partial nudity, if your eyes are quick enough)

http://youtu.be/_PpJHBg44rA

I am not happy with the pattern of transparency and after lots of 
experimentation this is the best I can come up with. I would appreciate 
it if anyone could point to a better method.

even incrementing it by 1/5000000000 per frame makes the output too 
jerky. I feel that I am taking the wrong approach.
The code follows.

#declare Dress_Map_Pos1 = 0.3  ;
#declare Dress_Map_Pos2 = 0.7  ;

#declare Turb_x = 2.5 ;
#declare Turb_y = 1 ;
#declare Turb_z = 2.5 ;

#declare Turb = < Turb_x,Turb_y,Turb_z>      ;

#declare Lambda_Var = 3 ;        ;

#declare Phase_Var =  0.000   + (frame_number/(5000000000)) ;


#declare JessiDress_1_=
material{
   texture {
     pigment {
       gradient < 0.000, 1.000, 0.000 >
       pigment_map {
   [Dress_Map_Pos1,
     uv_mapping
     image_map{
       jpeg "JessiSet2.jpg"
       interpolate 2
       map_type 0
       filter all 0.000
       transmit all 0.000
     }
   ]
   [Dress_Map_Pos1 +.01,
     colour rgbft <1.000,0.000,0.000,0.000,1.000>
   ]
   [Dress_Map_Pos2 -0.01,
     colour rgbft <1.000,0.000,0.000,0.000,1.000>
   ]
   [Dress_Map_Pos2,
     uv_mapping
     image_map{
       jpeg "JessiSet2.jpg"
       interpolate 2
       map_type 0
       filter all 0.000
       transmit all 0.000
     }
   ]
       }

       frequency 3.000
       phase Phase_Var
       scallop_wave
       noise_generator 3

       warp {
         turbulence <Turb_x,Turb_y,Turb_z>
         octaves 4
         lambda Lambda_Var
         omega 0.3
       }
       warp {
         turbulence <Turb_x,0,Turb_z>
         octaves 4
         lambda Lambda_Var
         omega 0.3
       }
     }
   }
}



-- 
Regards
     Stephen

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