Shaping Polygons

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  • smjmitchell
    #1

    Shaping Polygons

    Hi All,

    I am developing a application in VB 6.0. I need to plot a 3D mesh of
    quadrilateral and triangular polygons. I have this working OK in
    wireframe. The question I have is what is the easiest way to shade the
    polygons so that I can render the surface. Each polygon is defined by
    the coordinates in space of its corners. Initially I would be happy
    with a uniform shading (i.e. constant color) and that is really what I
    am asking for help with. However I would also like to eventually shade
    the polygons with a color graduation based on value of a parameter at
    each of the corners (i.e. to generate a contoured plot on the surface
    of the body) where the color represents the value at a particular
    point. Any comments on how this would be achieved would also be
    appreciated.

    Thanks,

    Steve
    Tags: None
    • Steve Gerrard
      #2
      Re: Shaping Polygons


      "smjmitchel l" <smjmitchell@ya hoo.com> wrote in message
      news:de4b00ab.0 309182035.370c1 758@posting.goo gle.com...[color=blue]
      > Hi All,
      >
      > I am developing a application in VB 6.0. I need to plot a 3D mesh of
      > quadrilateral and triangular polygons. I have this working OK in
      > wireframe. The question I have is what is the easiest way to shade the
      > polygons so that I can render the surface. Each polygon is defined by
      > the coordinates in space of its corners. Initially I would be happy
      > with a uniform shading (i.e. constant color) and that is really what I
      > am asking for help with. However I would also like to eventually shade
      > the polygons with a color graduation based on value of a parameter at
      > each of the corners (i.e. to generate a contoured plot on the surface
      > of the body) where the color represents the value at a particular
      > point. Any comments on how this would be achieved would also be
      > appreciated.
      >
      > Thanks,
      >
      > Steve[/color]

      VB6 is not so strong on graphics. I think you really have only a few choices
      here:
      1. Use Windows API calls, such as FloodFill, passing the hDC (device context
      handle) from your form.
      2. Buy a graphics control. There must be dozens, some not too spendy, that
      could save lots of time.
      3. Bump up to VB.Net, which has most of the GDI built in, including a
      Graphics.FillPo lygon method.

      Steve G.



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