3D Face from closed polyline

Discussion in 'AutoCAD' started by lawrence gabriel, Dec 25, 2003.

  1. Is there a way to create a 3D face from an enclosed polyline? is there a
    command or will I need to write a lisp program.

    I thought this command existed in R12 or R14 but I cannot find anything in
    R2000 or higher.

    Any suggestions will be appreciated
     
    lawrence gabriel, Dec 25, 2003
    #1
  2. lawrence gabriel

    Tom Berger Guest

    You can create a region from the polyline, write it to a non-binary
    STL file (command: STLOUT), and use the free app STLIN from
    http://www.archdim.de/STLIN.LSP to import the STL file and create
    3D-faces from the data. If your polyline has more then 3 vertices you
    will get more than one single 3D face.

    Tom Berger
     
    Tom Berger, Dec 26, 2003
    #2
  3. Hi Lawrence,

    A 3D face always has 4 vertices and all the sides are straight. Commonly
    two of the vertices are coincident so that the 3Dface appears as a triangle.

    It follows then that in general a polyline which can have from 2 to any
    number of vertices and may include curves cannot automatically be converted
    to a 3D face.

    You can write programs which will collect data from the polyline and create
    a series of 3DFaces to represent the polyline. You have to decide whether
    to abandon all curvature or to try and approximate it with chords.

    --


    Laurie Comerford
    CADApps
    www.cadapps.com.au
     
    Laurie Comerford, Dec 26, 2003
    #3
  4. lawrence gabriel

    jochen Guest

    I wrote such a LISP to convert plines to faces ( and then into SOLIDs)
    In case of interest please contact me via www.black-cad.de
    regards
    Jochen
     
    jochen, Dec 26, 2003
    #4
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