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Building a ruled surface by two curves |
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To build a ruled surface by two curves, use the Ruled surface by two curves 
command.
Step-by-step instructions
1.Select objects to be used as guiding curves.
The name of the selected object (or objects, if you specify a chain) is displayed in the fields Guiding curve 1 and Guiding curve 2 on the Parameters panel. After you specify the guiding lines, a phantom of the surface with numbered edges is displayed in the graphic area. The guiding lines are marked with "1" and "2" in marquees.
In the Parameter toolbar, in the Design section, a on-off switch Auto determination appears, which controls the splitting of the created surface into faces.
2.Select method of splitting. To do this, set the on-off switch Auto Determination to the required position.
•If the on-off switch is in position I (enabled), then the surface is automatically splitted into faces. Several methods for building a ruled surface are available – the Parameter panel displays a group of buttons Section alignment, allowing you to select the required method:
By the parameter of the guiding curves (method is chosen by default),
Along the length of the guiding curves,
By object,
By vertexes.
More details on building methods...
When the Auto determination is enabled for faces set selection, you can choose to build a surface with splitting into faces or without it. By default, ruled surfaces are built with splitting into faces, the number or transverse edges and the position of their vertexes are determined by the software. At this time option Split to edges is enabled on the Parameters toolbar. Switch it off in order to build a surface without splitting.
•If the on-off switch is set to position 0 (disabled), the surface splitting into edges can be configured by the user. In this case, a surface is built by the method By the parameter of the guiding curves, changing the method is not possible.
More details on establishing splitting a surface into faces...
3.To check a surface for self–intersections, please enable the Check of self-intersection setting. If any self–intersections are detected, a corresponding message will appear on the screen. More details about the self-intersection of surface...
4.If necessary, set the name of the created surface and properties of its display using the controls located in the section Properties on Parameter toolbar. Managing the color and optical properties of objects...
5.To complete the operation, click the Create an object 
button.
The created surface will be displayed in the graphic area; and in the Design tree there will be an icon .
6.To complete operation of the command, click Finish 
.
See Also
