DecalGroup example code

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Using special-purpose groups DecalGroup example code

Build an underlying surface shape, and decal shapes

Shape3D underly = new Shape3D( geom0, app0 );
Shape3D decal_1 = new Shape3D( geom1, app1 );
Shape3D decal_2 = new Shape3D( geom2, app2 );

Add them to a decal group, starting with the underlying surface

DecalGroup myDecals = new DecalGroup( );
myDecals.addChild( underly );  // First!
myDecals.addChild( decal_1 );
myDecals.addChild( decal_2 );