Subdivision surfaces

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    • July 10, 2011 at 19:33 #34993
      Alan Rockwood
      Participant

      Can anyone explain subdivision surfaces for me? I understand that it involves modeling the surface by breaking it into smaller and smaller pieces, but what is the mathematical description of a subdivision surface? Preferably, explain it in plain language, maybe with a few well-explained formulas to illustrate key points.

      Also, can Delftship export a NURBS equivalent or near-equivalent to a subdivision surface?

      Thanks.

    • July 11, 2011 at 19:42 #34995
      Marven
      Keymaster

      See the PDF document below for a mathematical description of a subdivision surface similar to the one used by Delftship.
      As far as conversion from/to NURBS is concerned:

      • Uniform non-rational Bspline surfaces can be presented by subdivision surfaces exactly
      • Non-uniform or rational surfaces are approximated
      • Conversion to NURBS is also exact
      Attachments:
    • July 12, 2011 at 02:40 #34996
      Alan Rockwood
      Participant

      Thank you for the pdf Marven. I will try to read it and understand it.

    • July 14, 2011 at 16:49 #35000
      Liliana
      Participant

      Marvin,

      Thanks for the paper, I read it as well, but however im unsure of your previous statement. To clarify, are you saying that importing a NURBS surface into Delftship means that the surface would be approximated however exporting Delftship into NURBS would be exact?

      Thanks so much for any help.

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