Re: Parametric Curves rendered as points

• To: visad-list@xxxxxxxxxxxxx
• Subject: Re: Parametric Curves rendered as points
• From: "William L. Hibbard" <WHIBBARD@xxxxxxxxxxxxx>
• Date: Tue, 13 Oct 1998 02:28 CST

Hi Steve,
 
To get VIsAD to render your helix as a curve, you need to
tell it about the topology of the points (it won't assume
that the 1-d sequence topology in domainT describes a
sequence topology in 3-D (rangeX,rangeY,rangeZ)).  To do
this, you can construct a Gridded3DSet with ManifoldDimension
 = 1, using the constructor
 
  Gridded3DSet(MathType type, float[][] samples, int lengthX)
 
where lengthX is the number of points and samples is dimensioned
float[3][lengthX], and type is a RealTupleType (rangeX,rangeY,rangeZ).
 
You can either represnet your helix data object as this Gridded3DSet,
or use this Gridded3DSet as the domain set of a Field (FlatField
or FieldImpl) that assigns dependent values along the helix.
 
Good luck, and please let us know if you have problems with this.
 
Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
whibbard@xxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
 
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