|
Projecting model objects into a sketch |
Scroll |
In this section:
Specifics of projecting objects of different types into sketch
Parametrical constraints for projection in sketch
Notes on working with the projection curve
Sometimes you may need to create lines or points in a sketch that represent the projection of three–dimensional objects on the sketch plane. This Project Object command 
is used for this purpose.
Step-by-step instructions
1.After calling the Project Object command, select the object to get the projection – a vertex, a face, an edge, a 3D curve, an axis, a point, etc. The result of the projection depends on the selected object. More details on projecting objects of different types...
After specifying the object, its projection in the sketch will be created. It can be:
•point with style Auxiliary,
•auxiliary line,
•one or more objects of the projection curve with the style Main.
A parametric constraint is automatically applied to the created projection — a projection link 
. If the projecting results in an opened projection curve, the constraints Projection of the end vertex 
are also overlaid on it. For more details on parametrical constraints for projection in sketch...
2.After the projection is created, the command does not finish working. If you need to construct projections of several objects, specify them in sequence.
3.To complete the execution of the command, press the Finish 
button in the heading of the Parameter panel.
|
Only one projection of each model object can exist in a sketch. |
Specifics of projecting objects of different types into sketch
Depending on the object selected for projecting, different geometric objects are created in the sketch.
•When projecting a vertex or a linear edge perpendicular to the sketch plane, a point with the style Auxiliary is created. In the latter case one of the vertices of the specified edge is projected.
•When projecting a coordinate or auxiliary axis, as well as an auxiliary plane perpendicular to the sketch plane, a auxiliary line is created. In the latter case the auxiliary line coincides with the projection line of the plane being projected to the sketch plane.
•When projecting an arbitrarily positioned edge or spatial curve, an object of type projection curve with style Main is created.
•When projecting a face, one or more objects of the type projection curve with the style Main can be created:
•If the face is specified in an arbitrary place, then projection curves are created which correspond to projections of the edges limiting the face, and projections of all portions of the outline in the direction of the normal to the sketch plane of this edge. When specifying a face, only its edges are highlighted, and the outlines being projected are not highlighted.
•If the face is specified near the outline, then a projection curve is created which corresponds to the projection of only this portion of the outline closest to the specifying. When specifying a face, the projected portion of the outline is highlighted.
Parametrical constraints for projection in sketch
A parametric constraint — Projection Link is automatically applied to any projection created in the sketch. This ensures a permanent link between the projection and the source three–dimensional object.
If the projection curve is opened, then constraints are also imposed on it Projection of the terminal vertex . It ensures that the extreme vertices of the projection curve coincide with the projections of the extreme vertices of the source object.
You may view and remove, if needed, any constraints applied to projection objects. These processes are detailed in the sections Working with constraints in the graphic area, Viewing and deleting constraints using commands.
|
Deletion of the constraint Projection link leads to the deletion of the projection link with the source object. The projection becomes a regular geometry object that can be moved and edited. The same result may be obtained when applying the Explode command to the projection. |
Notes on working with the projection curve
•You cannot change the shape of the projection curve (for example, you cannot change the radius of the circular arc). However, this curve can be truncated. The projection curve can also be used as a bounding object in alignment or extension commands.
•If as a result of trimming the projection curve became consisting of several parts, then when selecting one of the curve parts, all the other parts will be selected too.
•You can change the length of the projection curve by moving the characteristic points at its ends or at the ends of its parts (for this, you need to first delete the constraint applied to the curve points Projection of the terminal vertex). You can only move points along the curve. If the projection curve is a segment or arc of a circle/ellipse, then the defining points can be moved along the continuation of the curve (that is, the curve can be made longer than the projection of the source object).
•When copying a projection curve, the regular geometric object(s) will be created.
•Editing commands (shift, rotation, etc.) can be applied to the projection curve, if they include a mode in which the source objects are preserved when the command is executed. As a result of these commands, the ordinary geometric object(s) will be created.
•To return the projection curve to its initial state (for example, after trimming), use the Restore curve context menu command. The command is available in the context menu as long as the curve is linked with the source object (that is, the Projection link is in the list of constraints imposed on it).
See Also
