I created a structure from bicubic patches. I noticed that if I use a shiny
finish the reflected image is not smooth over the edges of the bicubic
patches. With a normal (red) pigment the object seems smooth, so there is no
reason why the reflection of a shiny surface should be broken.
I created the object manually, but I understand the nature of bicubic
patches and I am 99.9999% certain that the individual patches line up
smoothly.

I created the picture with the following code fragment. If needed I can
upload the complete code for "my_object" but for the sake of (starting) this
topic it may be confusing (its a list of patches with an even longer list of
3D coordinates).

object {
  my_object
  texture { Aluminum }
  // pigment { colour Red }
  rotate <0, 0, 90>
  translate <1, 0, 0>
  }

object {
  my_object
  // texture { Aluminum }
  pigment { colour Red }
  rotate <0, 0, 90>
  translate <0, -1, 0>
  }

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