Attached is a derivative of one of my recent testing animations for the 
bump_map{} updates.

The set up is simple. It relies on one of two long undocumented features 
shipped with POV-Ray in 'offset' (called 'ii_offset' in the yuqk fork).

With it one can start an image outside of the usual <0,0> to <1,1> 
square image area variously mapped onto surfaces - and with 'ii_offset' 
slowly move the image through the unit square based upon the frame_number.

The essential bit of code is:

     ...
     #declare Nrml00 = normal {
         bump_map {
             "hmmI.png" gamma 1.0
             ii_interpolate   2
             ii_map_type      1
             ii_once
             #if     (frame_number>0 & frame_number<=150)
                 ii_offset <-1.1+(2.2/300)*frame_number,0>
             #elseif (frame_number>150 & frame_number<=300)
                 ii_offset <0,0>
             #else
                 ii_offset <-1.1+(2.2/300)*(frame_number-150),0>
             #end
         }
     }
     ...
     union {
         sphere { 0, 1
             pigment { rgb 1 }
             normal { Nrml00 bump_size +127 rotate +60*y}
         }
         sphere {
             <1,1,0>/sqrt(2), 0.02
             pigment {rgb <1,0,0> }
             rotate +60*y
         }
         #if (frame_number>150 & frame_number<=300)
             rotate <0,-(frame_number-150)/150*360,0>
         #end
     }

And when rendering add +kff450 to the command line.

Bill P.

Aside: The other long undocumented feature is 'repeat <2d vector>' or 
'ii_repeat' in the yuqk fork. With 'ii_repeat' one can both scale and 
repeat images within the 2D unit image space, but it's not used here.

Post a reply to this message

Attachments:
Download 'ii_offset.mp4.dat' (885 KB)