Found the problem (replying to myself ;-)
I misunderstood what the contourCount was used for. I need to say that
my polygon as two contour... see in code...
Sorry for this. I even found the solution in the mail-archive... Must be
some FAQ somewhere addressing these sorts of recurrent problems, no ?
Mathieu Marache a �crit :
>
> Hi !
>
> I'm trying to address the same kind of problem, managing to create holes
> in polygons.
>
> Doug Gehringer a �crit :
> >
> > > From: "Yadav Khanal" <[EMAIL PROTECTED]>
> > >
> > > I would appreciate any one who can give me info about creating holes in
> > > shape3D object.
> >
> > The geometry utilities can be used to define a polygon with holes and then
> > decompose the polygon into triangles (see the javadoc for the GeometryInfo
> > class).
>
> I tried this and created this code :
>
> /*
> * Testing program for making holes in polygon using java3d
> * utilities
> *
> * Mathieu Marache 24/02/99
> */
>
> import com.sun.j3d.utils.geometry.*;
> import javax.media.j3d.*;
> import javax.vecmath.*;
>
> class Holes
> {
> public static void main(String args[])
> {
> /*
> GeometryInfo(GeometryInfo.POLYGON_ARRAY)
>
> The stripCounts array indicates how many vertices to use
> for each contour, and the contourCounts array indicates
> how many stripCounts entries to use for each polygon.
> The first contour is the bounding polygon, and subsequent
> contours are "holes." If contourCounts is left null, the
> default is one contour per polygon.
> */
>
> GeometryInfo ginfo = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
>
> /*
> Example of usage (taken from the javadoc):
> Triangulator tr = new Triangulator();
> tr.triangulate(ginfo); // ginfo contains the geometry.
> shape.setGeometry(ginfo.getGeometryArray()); // shape is a
> Shape3D.
> */
>
> float[] coordinates =
> {
> // positive contour : a big square
> 0, 0, 0,
> 5, 0, 0,
> 5, 5, 0,
> 0, 5, 0,
> // hole : a small square inside the big one
> 1, 1, 0,
> 2, 1, 0,
> 2, 2, 0,
> 1, 2, 0
> };
>
> ginfo.setCoordinates(coordinates);
>
> int[] stripCounts = {4,4};
>
> ginfo.setStripCounts(stripCounts);
>
int[] contourCounts = {2};
ginfo.setContourCounts(contourCounts);
> Triangulator tr = new Triangulator();
> tr.triangulate(ginfo);
>
> if (ginfo.getPrimitive() == GeometryInfo.TRIANGLE_ARRAY) {
> IndexedGeometryArray igarray = ginfo.getIndexedGeometryArray();
> int vertexCount = igarray.getVertexCount();
> System.out.println("vertex : " + vertexCount);
> int indexCount = igarray.getIndexCount();
> System.out.println("indexes : " + indexCount);
>
> for ( int i=0;i<indexCount; i+=3 )
> {
> System.out.println("facet " + i/3 + " : ");
> for (int j=i;j<i+3;j++)
> {
> //double[] coordinates;
> igarray.getCoordinate(igarray.getCoordinateIndex(j),
> coordinates);
> System.out.println(coordinates[0] + " , " +
> coordinates[1] + " , " +
> coordinates[2] );
> }
> }
> }
> }
> }
>
> But the result is just triangles corresponding to the two squares... Not
> a big square with a hole in it. Am I using it wrong or is triangulator
> not yet fully implemented ?
>
> > More complex operations, such as boolean operations on solids, must be done in
> > application code.
>
> definetly...
>
> Regards,
> Mathieu
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