PATTERNED_LENS

THE BOX'S MAIN HELP:

This implements a lens shader.
GEL  is a color applied to entire image.
EFX  controls the effect on the lens.
ZOOM ehances the lens effect.

GEL (input):

This must be a color.  The default is WHITE, no change.
This is a color applied to the entire image.

EFX (input):

This must be a scalar.  This is the effect factor.
The default is 0, no effect.  Larger numbers enlarge the image.

ZOOM (input):

This must a scalar.  This enhances the lens effect.  
1 is no enhancement. Negative numbers with invert the effect.

OUT (output):

This is the new color for the pixel.