[JAVA3D] Changing the colours of objects with picking

[Mr H. Morgan]

Hi,

I use Xj3d to build my scene graph.  I end up with a scene graph
composed of IndexedLineStripArrays and TriangleArrays.  I want the user
to be able to click an object and change its colour.  The below code
[1] works for IndexedLineStripArrays but not for TriangleArrays.  Is
says it has no colours [2].  The objects are different are different
colours to start with.

Where else can the colour information be?  I suspect I should be using
behavoiurs for this.  Any example code to do something similar?

Thanks for any help,

Hugh

[1]
PickCanvas pickCanvas = new PickCanvas(canvas, getLocale());
pickCanvas.setMode(PickTool.GEOMETRY_INTERSECT_INFO);
pickCanvas.setTolerance(5.0f);
pickCanvas.setShapeLocation(mouseEvent);

PickResult pickResult = pickCanvas.pickClosest();
PickIntersection pickIntersection =
  pickResult.getClosestIntersection
  (pickCanvas.getStartPosition());
GeometryArray geometryArray =
  pickIntersection.getGeometryArray();

for(int i = 0; i < geometryArray.getVertexCount(); ++i)
{
  geometryArray.setColor(i, colour);
}

[2]
java.lang.ArrayIndexOutOfBoundsException: GeometryArray: has no colors
        at javax.media.j3d.GeometryArray.getColors(GeometryArray.java:2987)

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