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Find Defect option in Rapidform XOR

Find Defect command provides you to detect four kinds of erroneous poly-faces; Non-Manifold Faces, Crossing Faces, Redundant Faces and Tangled Or Reversed Faces.

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How to use Find Defect command

Click dss2button on the toolbar, or click Tools > Mesh Tools > Find Defect.

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The application detects defect poly-faces and shows total defect poly-faces’ number and you can search erroneous triangles using or button.

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If you click Apply button, these all defected triangles will be selected.

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If you want to remove selected triangles, click Edit > Delete on the menu.

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Note

You can also search erroneous poly-faces using the Tool Pallet and select poly-faces by clicking Select button.

Options in Detail

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l Non-Manifold Poly-faces – The result shows total number of detected Non-Manifold Poly-faces and you can change color as you want.
l Crossing Poly-faces -The result shows total number of detected Crossing Poly-faces and you can change color as you want.
l Redundant Poly-faces – The result shows total number of detected Redundant Poly-faces and you can change color as you want.
l Tangled Or Reversed Poly-faces –The result shows total number of detected Tangled Or Reversed Poly-faces and you can change color as you want.

Non-manifold poly-faces, redundant poly-faces and crossing poly-faces are defined as follows:

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Non-manifold Poly-Face

When poly-faces share three or more edges, it is called non-manifold topology. In a pure mathematical term, to be a manifold topology, only two poly-faces can constitute an edge. However, an edge with only one poly-face is classified as a boundary edge in Rapidform XO and considered to be normal.

The non-manifold poly-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 poly-faces (V1 V2 V4), (V2 V4 V3), and (V2 V4 V5) share edge (V2 V4).

dss9Redundant Poly-face

Redundant poly-face means a kind of abnormal poly-face from the viewpoint of a poly-vertex. Other than boundary poly-vertices, one poly-vertex must have identical number of poly-faces and edges incident to it.

A poly-face violating this rule is called a redundant poly-face.

The following picture shows an example of a redundant poly-face (V1 V2 V3).

dss10Crossing Poly-face

When edges sharing a poly-vertex intersect with one another, they are geometrically incorrect and their poly-faces are called crossing poly-faces.

Explaining crossing poly-face by an example, the edge (V2 V3) of poly-face (V1 V2 V3) is crossed with the edge (V1 V4) in the following picture.

Although crossing poly-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.

dss11Tangled Or Reversed Poly-face

Every poly-face has its normal information. If the normal direction of poly-face is opposite to neighboring poly-face, it is tangled or reversed poly-face.

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