Reference and Constraints with AutoCAD - Section 3

15.2 Creating an SCP

In certain circumstances, it may be useful to change the point of origin, since the determination of the coordinates of new objects to be drawn can be facilitated from the new SCP. In addition, we can save the configuration of different Personal Coordinate Systems assigning them a name to be reused as appropriate, as we will see in this chapter.
To create a new SCP we can use one of the various options that the context menu of the SCP icon itself has. We could also invoke the “SCP” command that will display the same options in the window. We also have a section on the ribbon called “Coordinates”, but this section only appears in the “Basic 3D Elements” and “3D Modeling” workspaces, as shown above.
You can use any of the paths that lead to the options of the SCP command indistinctly, as long as they correspond to both the context menu, the ribbon or the command in the window. In any case, among the options used to create a new UCS, the simplest, of course, is the so-called "Origin", which simply asks for the coordinates that will become the new origin, although the direction of X and Y it does not change. It should be added that this same action, changing the origin point and creating a UCS, can also be achieved simply by moving the icon with the cursor and taking it to the new point, although this method has other sub-options that we will study later.

As is logical, once the new origin is established, and from it, the X and Y coordinates of all the other objects are redefined. To return to the Universal Coordinate System (SCU), we can use the corresponding button of the ribbon or the contextual menu, among other options that we already mentioned.

If the SCP that we created indicating the new origin is going to be used frequently, then it will have to be recorded. The fastest way to do this is to use the context menu. The new SCP will now appear on that menu, although we also have a saved SCP administrator that will allow us to move between them.

Obviously, "Origin" is not the only command to create an SCP. We actually have various commands so that our SCP can be adapted to the different needs of a design. For example, the “3 points” option allows us to indicate a new point of origin, but also the direction where X and Y will be positive, so the orientation of the Cartesian plane can change.

We can also create an UCS that fits one of the objects drawn on the screen. The option, of course, is called “Object”, although in reality this option will be much more useful to us when we work on 3D objects.

The rest of the options to create Personal Coordinate Systems, such as “Face” or “Vector Z” have to do with drawing in 3D and are treated in the Eighth Section, in particular in chapter 34, which will also give us the opportunity return to the dialog box mentioned above.
In the example of the sketch, it is convenient for us to create a Personal Coordinate System that adjusts to the line that limits the street, that will allow us to have a UCS aligned with the new object to be drawn. As we have already seen, we can use the options “3 points” or “Object”. Obviously, this makes it easier to draw the sketch, since it is not necessary to take care of the inclination of the lines, as was the case with the Universal Coordinate System. In addition, it is not essential to be viewing the drawing "tilted" either, since we can rotate the drawing until the UCS is orthogonal to the screen. That is what the “Plant” command is for.

As the reader can infer, it would be enough to restore the SCU and then make a plant view to return the drawing to its original position.

With the use of tools for the construction of simple objects, together with those for reference and object tracking, plus the domain of zoom tools, the administration of views and the control of personal coordinates, we can say that we have all the elements necessary to draw with ease in Autocad, at least in the space of 2 dimensions. The constant practice, plus the knowledge of the technical drawing area in which you want to work (engineering or architecture, for example), will allow us to have a highly productive performance in our professional field. However, although we have already completed the study of the knowledge necessary to create drawings with this program, we still need everything related to its edition, that is, with its modification. Theme that we will address in the next section.

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