Messing with textures for use in spherical structures (because reasons).

Couldn't get the effect I was after with black hole warps, so a function pigment
instead:

#declare Pattern = function {
 pigment {
  agate color_map { [0 rgb 0] [1 rgb 1] }
 }
}
#declare Sucker = function(x,y,z,R) {
 select(
  sqrt(x*x + y*y + z*z) - R,
  Pattern(R*x/sqrt(x*x+y*y+z*z), R*y/sqrt(x*x+y*y+z*z),
R*z/sqrt(x*x+y*y+z*z)).x,
  Pattern(x,y,z).x
 )
}

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