Aluminium profile with inverted normals

Discussion in 'Design and Modeling' started by warper, Apr 23, 2009.

  1. warper
    warper New Member
    I am stuck. Trying to use Blender's "Recalculate normals inside/outside" does not help. Whatever I do, there seem to be inverted normals. Using AccuTrans 3D and MeshLab does not reveal anything unusual to the untrained(!) eyes.

    Would be happy for any help.

    Attached Files:

    • test.3ds

      File size:
      25.3 KB
  2. warper
    warper New Member
    An additional note: I'll attach a snapshot of a view. This is an aluminium profile piece that is non-convex and has a cylindrical hole through the profile. Maybe this is impossible to get right by itself.
    NB: The final object to be processed will consist of numerous of these profile pieces. The uploaded piece is a minimal test case for me.

    Attached Files:

  3. warper
    warper New Member
    Still hoping for some insight - or is this a question with a completely obvious answer? :eek:

  4. Whystler
    Whystler New Member
    Hey warper, you might have better luck posting int he 3D design part of the forum. Folks there ask and answer a lot of questions similar to yours. :)

  5. warper
    warper New Member
    Hi Whystler,
    I've seen some other posts by you - thanks for answering.
    Did you mean to suggest another forum? It tells me "3D Design" as the forum I actually posted in!?
  6. RalphVdB
    RalphVdB Well-Known Member CS Team
    Hi Warper,

    i took a look at your model and fixed it for you. You have to beware of the unit size though, and perhaps rescale it a bit because it doensn't meet our minimum sizes.

    Hope this helps,



    Attached Files:

  7. warper
    warper New Member
    Hi Ralph,
    Thanks a lot. Even more interesting than the fixed file would be the reason for the problem and how I could have seen and fixed it myself. Anything simple like "look closer for individual inverted normals"?
    EDIT: The reason for the question of course is that I want to have a model built that consists of ~30 such profile pieces. Without myself being able to fix them would be prohibitive to testing out designs.

    Last edited: Apr 29, 2009
  8. pete
    pete Shapeways Employee CEO & Co-Founder