I've made a highly reflective blimp using a union of several bicubic_patch
elements.  My problem is that the reflection of the horizon is extremely
blocky.  The u_steps and v_steps have been set to 3 and I get slightly
better results when setting them higher, but at a huge cost in render time
(I'm making an animation).

Here is a snippet of code for the blimp;

// blimp_body
#declare blimp_body = union {
 bicubic_patch {
  type 1
  flatness 0
  u_steps blimp_usteps
  v_steps blimp_vsteps
  <-2.742, 0.003, -0.002> <-2.742, 1.486, -0.002> <-1.480, 2.748, -0.002>
<0.004, 2.748, -0.002>
  <-2.742, -1.481, -0.002> <-2.742, 0.003, -0.002> <-1.480, 2.748, -3.872>
<0.004, 2.748, -3.872>
  <-1.480, -2.743, -0.002> <-1.480, -2.743, -3.872> <0.004, 0.003, -9.752>
<0.004, 1.628, -9.752>
  <0.004, -2.743, -0.002> <0.004, -2.743, -3.872> <0.004, -1.623, -9.752>
<0.004, 0.003, -9.752>
 }
 bicubic_patch {
  type 1
...
...

You can see a small sample image showing the blocky horizon at;
http://home.attbi.com/~sblaufuss/scene250.bmp

Any help with this would be appreciated.

Thanks,
Scott

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