flat shading

How do I use Preview or Material to show a mesh with flat shading? I saw one other question, but the answer wasn't helpful, or I couldn't figure it out.

thanks

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Permalink Reply by Eric Mims on November 10, 2011 at 4:03pm

Is it just a slow day on the forum or is this not possible?

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Permalink Reply by David Rutten on November 11, 2011 at 5:05am

I don't think that's possible.

David Rutten

david@mcneel.com

Poprad, Slovakia

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Permalink Reply by Eric Mims on November 11, 2011 at 9:22am

I just figured it out. I Decomposed the mesh, then created a new mesh using the vertices and faces, but graphed the faces input. It displays as a flat shaded object in Rhino.

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Permalink Reply by David Rutten on November 11, 2011 at 10:37am

Oh dear, that means you get an individual mesh for every face in the original mesh. Unwelding would be a better approach, though there is no unweld function available in the Rhino4 SDK.

David Rutten

david@mcneel.com

Poprad, Slovakia

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Permalink Reply by Eric Mims on November 11, 2011 at 10:41am

Well, fortunately this is for a very course mesh.. a heavily faceted surface that I wanted to be able to visualize as faceted without having to bake each time.

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Permalink Reply by Vicente Soler on November 11, 2011 at 12:00pm

You can try using the following code to sort of "unweld" a mesh. Just paste the code inside a vb.net component and connect the mesh to the x input.

Dim m As New mesh

    Dim c As Integer = 0
    For i As Integer = 0 To x.faces.count - 1
      Dim pts(2) As point3f
      Dim ptd As New point3f
      x.Faces.GetFaceVertices(i, pts(0), pts(1), pts(2), ptd)
      m.Vertices.AddVertices(pts)

      If x.Faces(i).IsTriangle Then
        m.Faces.AddFace(c, c + 1, c + 2)
        c += 3
      Else
        m.Vertices.Add(ptd)
        m.Faces.AddFace(c, c + 1, c + 2, c + 3)
        c += 4
      End If
    Next
    m.Normals.ComputeNormals
    a = m