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97 lines
3.1 KiB
Plaintext
97 lines
3.1 KiB
Plaintext
/*!
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\page reorient_faces_page Orient faces
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\n This operation allows fixing the orientation of a set of faces in
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the following ways:
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<ul>
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<li>The required orientation of a set of neighboring faces can be defined
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by a vector giving the direction of a normal to a certain face. <br>
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Since the direction of face normals in the set can be even opposite,
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it is necessary to specify a \a control face, the normal to which
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will be compared with the vector. This face can be either:
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<ul>
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<li>found by proximity to a given point, or</li>
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<li>specified explicitly.</li>
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</ul>
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</li>
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<li>Alternatively, the faces can be oriented relatively to the adjacent volumes.</li>
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</ul>
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The orientation of a face is changed by reverting the order of its nodes.
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<em>To set orientation of faces:</em>
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<ol>
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<li>In the \b Modification menu select <b>Reorient faces</b>
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item or click <em>Reorient faces</em> button in the toolbar.
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<center>
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\image html reorient_faces_face.png
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<em>"Reorient faces" button</em>
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</center>
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</li>
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<li>In the "Reorient faces" dialog box
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<ul>
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<li>Select the \b Object (mesh, sub-mesh or group)
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containing faces to reorient, in the Object Browser or in the 3D
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Viewer.</li>
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<li>To reorient by direction of the face normal:
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<ul>
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<li>Specify the coordinates of the \b Point by which the control face
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will be found. You can specify the \b Point by picking a
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node in the 3D Viewer or selecting a vertex in the Object
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Browser.</li>
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<li>Set up the \b Direction vector to be compared with the normal of the
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control face. There are following options: <ul>
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<li>adjust vector components directly;</li>
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<li>select a vertex in the Object Browser or a node in the 3D
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Viewer; their coordinates will define vector components;</li>
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<li> pick two nodes (holding Shift button), the \b Direction vector
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will go from the first to the second node.</li>
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</ul>
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</ul>
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<br>
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<center>
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\image html reorient_2d_point.png "The orientation of adjacent faces is chosen according to a vector. The control face is found by point."
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</center>
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</li>
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<li>In the second mode it is possible to pick the \b Face by mouse in the 3D Viewer or directly input the \b Face ID in the corresponding field.
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<center>
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\image html reorient_2d_face.png "The orientation of adjacent faces is chosen according to a vector. The control face is explicitly given."
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</center>
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</li>
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<li>In the third mode, the faces can be reoriented according to volumes:
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<ul>
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<li>Select an object (mesh, sub-mesh or group) containing
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reference \b Volumes, in the Object Browser or in the 3D
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Viewer.</li>
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<li>Specify whether face normals should point outside or inside
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the reference volumes using <b>Face normal outside volume</b>
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check-box.</li>
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</ul>
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<br>
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<center>
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\image html reorient_2d_volume.png "The orientation of faces is chosen relatively to adjacent volumes."
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</center>
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</li>
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</ul>
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<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
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</ol>
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<br><b>See Also</b> a sample TUI Script of a
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\ref tui_reorient_faces "Reorient faces" operation.
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*/
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