Tinkering with various user defined cameras I often seem to run into the 
following; using select in a function you either select bigger smaller or 
bigger and equal or smaller:

from a stereo cam:
#local D2_X_Fn = function(u,v){
  select(
    (u<=0),   //u<0????
    -1,
    D1R_X_Fn((u/AspectU*image_width)-0.25,v),
    D1L_X_Fn((u/AspectU*image_width)+0.25,v)
  )
};

the alternative is select only smaller or bigger resulting in a pixel wide 
black line.

So, what to do with the pixel in the middle? Another select with u=0?

ingo

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