|
Projection point |
Scroll |
You can build a point by projecting an already existing (reference) point onto an object – a surface or a line.
Objects onto which a reference point is projected can be:
•faces, auxiliary and coordinate planes;
•ribs, spatial curves, sketch lines, auxiliary straight lines, coordinate axes.
The projection can be performed orthogonally or in direction specified by an object.
For constructing the projection of a point onto an object, use the Projection Point 
command.
Step-by-step instructions
1.Specify a reference point. The name of the point is displayed in the Reference Point field on the Parameter Panel.
2.Select an object onto which a reference point is projected. The name of the object is displayed in the Object field, and a phantom of the orthogonal projection of the point appears in the graphic area.
3.If you want to set projection direction other than orthogonal, specify a guiding object or draw a vector.
•Guiding objects:
•spot.. Direction is a straight line passing through this point object and the specified reference point.
•Straight-line. Direction is a straight line parallel to the object.
•Planar. Direction is a line perpendicular to the object.
The name of the selected object is displayed in the Guiding Object field.
•To build a vector, press the Build Vector 
button located to the right of the Guiding Object field. This will start a vector building sub-process (see section Vector). Follow the plotting process and press the Create Object button. The system will return to the point creation process.
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 
.
A point appears in the graphical area, and in the Construction Tree — its icon 
.
6.To complete operation of the command, click Finish 
.
|
The point is only built when the projection falls on an object rather than its continuation. The exceptions are a plane surface and a revolution surface when the projection can be built on their continuation. Auxiliary and coordinate planes and axes are infinite, so the projection is created independently of its position relative to the rectangle or segment representing the plane or axis. |
See Also
