CSG-operation in Java3D + templates

Need to do CSG (constructive solid geometry) boolean operation (difference, union, intersection) on Java3D shape objects. Using Java 3D, user may create objects by adding geometries to a Shape3D, in this case user adds faces. It s assumed that all faces are counter clockwise. We have tested [login to view URL] (we wrote it in Java) and it works well but when edges/faces are near each other it produces wrong results. The resulting shape contains unexpected faces or other geometries that should be ripped off. Attached is an example in obj-format. The "plain" wall shall be cut by "cutter" but it is wrong (operation is difference). We have tested our solution by transforming a Shape3D into csg-format, then doing the operation, and finally back to Shape3D-object. We have also tested UnbBoolean-library but the problem is eternal loops. Also, we cannot use that. We include [login to view URL] -files that use Java3D vecmath- and media libraries. We convert a Shape3D into "csg" by the code which is attached. We also need solutions and advices to the following: - a parametrized cylinder using faces (user may define how many segments, length), we do not want to user Java3D primitives directly. - a parametrized hollow core cylinder (user defines outer radius, thickness, length) - how to orientate a Shape3D into a direction? let us say direction is gives by a Vector3d, example we create a hollow core cylinder and then orientate it into a direction - shall the geometry be transformed or what? Remember the boolean operation possibility. - in Java3D, when objects are placed, how to get a view point to view the whole model Additional information. This is a repost of an older post, which we never realized due to technical problems.