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Mid-surface building |
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The command used to build the average surface is Mid-surface
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Procedure
1.Specify a face or set of faces as the first surface. The name of the object(s) will appear in the Surface 1 field on the Parameter panel.
Then activate the Surface 2 field and specify a face or set of faces as the second surface. The name of the objects will appear in the field
If the Select tangent faces option is enabled, then when you specify one face, the group of adjacent faces that include it, connected smoothly or tangentially, is automatically selected along with it.
After specifying the faces of the first and second sets, the phantom of the middle surface appears in the graphic area. The absence of a phantom is a sign that it is impossible to build the middle surface relative to the selected source objects.
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In the case where several faces are selected as the initial surface, the result of construction depends on how they are joined together: •if the edges are joined smoothly or tangentially, then the result is one surface, •in other cases, separate surfaces are formed. |
2.In general, the appearance of the mid-surface may differ depending on which of the source surfaces is the base surface. The source surface is the set of faces on which the middle surface calculation algorithm performs the initial splitting. The other source surface is the counter surface.
To select the base set of faces, click the required button in the Direction of calculation group
From surface 1 — the first set of faces is basic,
From surface 2 — the second set of faces is basic,
3.The mid-surface can be built taking into account the boundaries of the mating source face(s) or using the theoretical surface of the face. Select the method for calculating the mid-surface using the option Consider borders.
•If this option is enabled, only points within the corresponding source face(s) are used in the calculation.
•If the option is disabled, points of theoretical surface of face may be used. If necessary, the theoretical surface of the face is extended.
4.You can build a mid-surface equidistant to the source surfaces. The Identify equidistants option is used for this. If all the faces of the first source surface are equidistant to the faces of the second source surface, then when the option is enabled, the middle surface is built equidistant to the faces of both source surfaces. The following parameters are ignored: the selection of the base surface in the Calculation direction group and the state of the Consider boundaries option (the boundaries of the original surface are not taken into account).
5.The mid-surface can be trimmed by the body to which the source faces belong. The Trim the result option is used for this purpose.
•When this option is enabled, the middle surface is trimmed by the edges of the body.
•When this option is disabled, the mid-surface is built without trimming.
The Trim the result option is present in the Parameter panel if all faces of the source surfaces belong to the same body.
6.If you need to check the surface for self-intersections, enable the Check for self-intersections option. If self-intersections are detected, a corresponding message will appear on the screen, and the created surface will be marked as erroneous in the Design tree.
Details about self-intersection of surface...
7.If necessary, specify the name of the mid-surface and its display properties using the controls located in the Properties section of the Parameter panel.
Details about color and optical properties management of objects...
8.To confirm the creation of the mid-surface, click the button Create object 
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The created surface will be displayed in the graphic area, and its icon will appear in the Design tree. .
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If the building results in more than one surface, then after the operation is completed, the process of changing the set of surfaces is launched. Select the surfaces to be left. Details... Each of the remaining surfaces is a separate object. You can, for example, change the color of the surface, hide it, or move it to a layer. However, they all remain created by one operation, so if you edit the operation, all of these surfaces are changed. |
9.To complete the command, click the button Finish 
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See also
