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94 lines
3.0 KiB
Plaintext
94 lines
3.0 KiB
Plaintext
/*!
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\page reorient_faces_page Reorient faces
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\n This operation allows changing the orientation of a set faces in the following ways:
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<ul>
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<li>The new orientation of a set of neighboring faces can be defined
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by a vector. <br> Since the direction of face normals in
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the set can be even opposite, it is necessary to specify a control
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face, the normal to which will be compared with the vector. This face can be
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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 change 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 according to vector:
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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 easy specify the \b
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Point by either picking a node in the 3D Viewer or selecting a vertex
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in the Object Browser. It is possible to pick the \b Face by mouse in
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the 3D Viewer or enter its ID.</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. If you pick a node in the 3D Viewer then the \b Direction
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vector will go from the coordinate system origin to the selected node.
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If you pick two nodes (holding Shift button) then 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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<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 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 with relation 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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