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