How do you fix inverted normals on rhino

Discussion in 'Design and Modeling' started by sn888, Mar 1, 2010.

  1. sn888
    sn888 New Member
    Hi i would like to 3d print a model but i have recieved an email saying, (Your model has inverted normals in it) can someone please help me...

     

    Attached Files:

  2. Salokannel
    Salokannel New Member

    Hi!

    On your tool bar there's tool with three arrows pointing up from blue surface
    or you just write ANALYZE DIRECTION. Then select your object.
    Now you'll see a lot of white arrows pointing from your object. Now arrows
    pointing inside to your object (wrong way normals). Just press left mouse button on one arrow and it will change the direction (arrows/normal). Then enter. Now it should be alright!

    Cheers,
    Pekka
     
  3. MichielCornelissen
    MichielCornelissen New Member
    Although, if your object is watertight ('closed' in rhino terms), it will always have the normals facing outward. If your stl file hasn't, it'll mean that your object wasn't closed in the rhino file (check with ShowEdges), or something somehow went wrong with the meshing part.
    If it's the latter: you can do meshing directly by exporting to stl, or you can create a mesh from polysurface first ('mesh' command), and then export that mesh. In my experience, sometimes one will work where the other doesn't.

    Cheers, hope that helps, Michiel

    <a href="http://www.michielcornelissen.com" target="_blank"></a>
     
  4. aoster
    aoster New Member