Hi John,
> I have created an ellipsoid using the Gridded3DSet. However, in order to
> create proper grids, two functionTypes and two Gridded3DSet were need; one
> for the top hemisphere and one for the bottom. The incomplete code look
> something like the following:
>
> functiona = new FunctionType(xyz, v); //function domain as xyz and range as
> v (for surface mapping).
> functionb = new FunctionType(xyz, v);
Since these FunctionTypes are identical, you only need one
of them.
> Gridded3DSet seta = new Gridded3DSet(xyz,samplesa, 41, 41);
> Gridded3DSet setb = new Gridded3DSet(xyz,samplesb, 41, 41);
>
> This works fine and the ellipsoid looks good, but there is a very obvious
> cut in the middle (like an equator on a globe). Should I try another way
> of rendering this? Is there a way to do this without two sets and two
> functiontypes?
Yeah, you can make a 2-D grid (in a Gridded3DSet with manifold
dimension = 2) where the four edges are all very close to the
north pole.
If you use an Irregular3DSet with manifold dimension = 2, the
samples can be more evenly spaced, although it is a little tricky.
You have to create an appropriate DelaunayCustom for the 2-D
topology.
> On a separate issue:
> I was thinking of using irregular3DSet, but I don't fully understand it.
> Just to test irregular3DSet I replaced the Gridded3DSet as:
> Irregular3DSet seta = new Irregular3DSet(xyz, samplesa);
> Irregular3DSet setb = new Irregular3DSet(xyz, samplesb);
> But all I get was points in space.
You need to use the constructor where you pass it a DelaunayCustom
(extends Delaunay) with manifold dimension = 2.
Good luck, Bill
