These X3D files (with XML encoding) are examples of use of the NurbsTrimmedSurface node with an inner hole defined by a NurbsCurve2D node.

For each file the base surface is a square, with side 8 units in length, in the x-y plane and centered at the (0,0,0) origin. For each file an interior hole is defined by a Contour2D node which in turns contains a NurbsCurve2D node defining a circular hole of radius 1 unit.

Each file also includes a triad of unit length line segments originating at the origin x,y,z=(0,0,0) marking the x-axis (red), y-axis (green), and z-axis (blue)

The screenshots shown for each X3D file were made with the InstantPlayer X3D browser (v 2.0) running on Mac OS 10.6.8

hole_cutout.x3d The circular hole is centered at the origin.

hole_cutout_trans_1.x3d The circular hole is centered at the point (1,1) in the (u,v) coordinate system (coincides with (x,y,z) = (1,1,0) in 3-D space).

hole_cutout_trans_2.x3d The circular hole is centered at the point (2,2) in the (u,v) coordinate system (coincides with (x,y,z) = (2,2,0) in 3-D space).