Re: points in 3D space

• To: John Yao <johnyao@xxxxxxxx>
• Subject: Re: points in 3D space
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Wed, 7 Aug 2002 17:17:25 -0500 (CDT)

Hi John,

> I want to show only data points in 3D space.  I have used the following
> code to do that:
>
> Irregular3DSet testset = new Irregular3DSet(xyz,testsamples);
>
>          DataReferenceImpl points_ref = new DataReferenceImpl("points_ref");
>          points_ref.setData((Set)testset);
>
>          ConstantMap[] pointsCMap = { new ConstantMap( 1.0f, Display.Red ),
>                               new ConstantMap( 0.0f, Display.Green ),
>                               new ConstantMap( 0.0f, Display.Blue ),
>                               new ConstantMap( 5.50f, Display.PointSize )  };
>
>          display.addReference( points_ref, pointsCMap );
>
> However, this method is very slow.  Is there another function or better
> method to accomplish this?

Here's a much faster way, if you only want to show points:

  RealType index = new RealType("index");
  FunctionType fxyz = new FunctionType(index, xyz);
  Integer1DSet set = new Integer1DSet(testsamples[0].length);
  FlatField field = new FlatField(fxyz, set);
  field.setSamples(testsamples);
  points_ref.setData(field);
  . . .

Since you are only showing points, the considerable time
to compute the Delaunay triangulation topology in the
Irregular3DSet constructor is not necessary.

Good luck,
Bill

• References:
  • points in 3D space
    • From: John Yao