Clean
Clean menu provides a set of commands for detecting and fixing topological or geometrical defects and unnecessary data.
Typical abnormal faces defined in Clean tools are as follows:
| Non-manifold Face When faces share three or more edges, it is called non-manifold topology. In a pure mathematical term, to be a manifold topology, only two faces can constitute an edge. However, an edge with only one face is classified as a boundary edge in RapidFormT and considered to be normal. The non-manifold faces may cause severe errors in various calculations, and even fatal errors in other applications such as NC machining. The following picture shows an example of the non-manifold topology, where faces ( V1 V2 V4 ), ( V2 V4 V3 ), and ( V2 V4 V5 ) share edge ( V2 V4 ).
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| Redundant
Face Redundant face means a kind of abnormal face from the viewpoint of a vertex. Other than boundary vertices, one vertex must have identical number of faces and edges incident to it. A face violating this rule is called a redundant face. The following picture shows an example of a redundant face ( V1 V2 V3 ).
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| Crossing
Face When edges sharing a vertex intersect with one another, they are geometrically incorrect and their faces are called crossing faces. Explaining crossing face by an example, the edge ( V2 V3 ) of face ( V1 V2 V3 ) is crossed with the edge ( V1 V4 ) in the following picture. Although crossing face is neither a topological definition nor a possible cause of sever problems, it may cause errors in geometrical calculation and, therefore, must be corrected.
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| Unstable Face Edge of adjacent faces each other in basis of topology. those faces is called Unstable faces. Though those faces' boundaries can be identified in "Show Boundary" command, boundaries can not be identified in "Fill Holes" command.
example 1 : Bad Normal
example 2 : twisted faces
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