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Point On Surface |
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You can build a point on the selected surface. The following may be used as a surface:
•faces,
•auxiliary and coordinate planes.
You can specify the point position:
•by offsetting (linear or angular) from the two selected reference objects,
•by coordinates:
•on a plane surface – in the rectangular or polar coordinate system,
•on a cylindrical surface – in the cylindrical coordinate system,
•on a spherical surface – in the spherical coordinate system;
•by offsetting the theoretical surface of the selected face along the U and V isoperimetric curves; for more details on the theoretical surface see section Parametric representation of the surface. Isoperimetric curves Add-Ons Curves and Surfaces.
A point position may be also defined by a spot item contained in a model.
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Available methods to set point position depend on the selected edge or face parameters. If you create point on an face of a polygonal object You can only specify its position using the mouse or link it with an existing spot object. Details... |
Use the Point on Surface 
command to plot a point on the surface.
Step-by-step instructions
1.Select a face or plane to plot a point. The name of the selected object is displayed in the Surface field on the Parameter Panel.
A phantom of the point is located at the specified location on the surface.
2.Use one of the following methods to specify the point position:
•Use the mouse to drag the point to the required position on the face/plane in the graphic area. Parameters of point position will be displayed in fields of the Parameters toolbar depending on the creation method selected in the group Move (descriptions of methods are provided below).
•Using the fields on the Parameter Toolbar — select the variant of point construction in the Displacement group on the Parameter Toolbar and set the required parameters:
By Offsetting from Two Objects: enter point offsets from the specified objects in fields Distance 1/Angle 1 and Distance 2/Angle 2;
By plane coordinatesSelect the type of coordinates: rectangular or polar — and set their values;
By cylinder coordinatesSet the A and Z coordinates of the point;
By sphere coordinates: Set the A, B coordinates of the point;
By U and V parameters: set the U and V parameters of the theoretical surface of the face.
•By connecting to the point object — specify the required point object. The created point will coincide with the projection of the specified object on the face or surface (point projection on the face is performed taking into account the state of the option Consider boundaries, see the next item). The name of the selected point object is displayed in the field Snap point. An associative link is automatically created between the point object and the created point. Due to this, the point will move with the object when its position changes.
To delete the link with the point object, click the 'x' icon in the snap point.
3.If the point is located precisely within the face, enable the Allow for Borders option. When the option is disabled, the point may be also located outside the face (the theoretical surface of the face is extended, if required).
If the point is being constructed on an auxiliary or coordinate plane, the option is unavailable because the plane has no boundaries.
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When the Consider boundaries option is enabled, and in cases where the given point object does not project onto a face or it is impossible to extend the theoretical surface of the face, the created point will coincide with the nearest point on the surface to the given object. |
4.Advanced plotting options.
•You can select a coordinate system relative to which a point will be located. To do that, use the Coordinate System section. Details...
•You can change the name, color and style of the point display. To do that, use the Properties section.
5.To complete the operation, click Create an object 
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A point appears in the graphic area, and in the Construction Tree, its icon 
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6.To complete operation of the command, click Finish 
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•You can change the position of the created point in the graphic area by moving the defining point (see section Defining Points of Objects).
•For setting linear and angular parameters, you can use geometrical calculator.
•You can assign tolerances to the values of the operation parameters expressed in linear and angular values. To do this, invoke the Tolerance command located in the menu of the required parameter, or click the 
icon displayed in the parameter field (the icon is shown if a tolerance is assigned to the parameter value). More details on assigning tolerance...
See Also
