3D Drawing with AutoCAD - Section 8

38.1.9 Offset

Do you remember that in the 18.1 section we studied a command called 2D Object Offset? Do not? Insurance? And what if you go back to the index and review it? It never hurts to revisit a topic to remember it.
The allusion is of interest because this Offset command for surfaces works similarly: It creates a new surface parallel to the existing one, although not necessarily the same size. Between the options of the command we must establish the side in which the new surface is to be created, the distance, if the edges go or not to keep connected and if we want that the result is a solid.

38.2 Conversion to surfaces

Another method to create surfaces is through the conversion of other 3D objects, such as solids and mesh objects. The Convert to Surface button is located on the Home tab in the Edit Solids section. The same button is also available on the Mesh tab in the Convert Mesh section. No matter which one you use, you can select solids, meshes, and regions and convert them to procedural surfaces.

In turn, these procedural surfaces can be converted to NURBS surfaces with the Control Vertices section button on the Surfaces tab. Although with this button we can also select, again, solids and meshes.

38.3 Editing surfaces

We have repeatedly insisted throughout this chapter that the main difference between process surfaces and NURBS surfaces lies in the type of editing we can do. In the first case it is always a matter of editing them through their grips or, preferably, through the profiles on which it depends. In the case of NURBS surfaces the editing is more flexible, since we can modify it using its different control vertices, which, in turn, we can increase its number through the regeneration of the surface and we can even add vertices in very points Specific information.
However, there is also a set of basic surface editing operations that apply to both types and which need to be reviewed in the following subsections.

38.3.1 Splice

Do you remember how the Splicing command works for 2D objects? The subject is in the section 18.4 and it would not be of more reread it. The splicing command works identically only in the 3D environment, so instead of cutting lines and joining them with an arc, the surfaces are trimmed and joined with a curved surface, to which we can also specify a value of Radio or interactively modify it using its grip.
The button is located in the Edit section of the Surface tab.

38.3.2 Crop

Similar to the previous case, the command that allows us to trim surfaces works as your pair for 2D objects. As you will remember, we cut lines using others as a cutting edge. Here we cut a surface using another surface as cutting edge also, therefore, it must intersect it.

It must be said that this command can be reversed using Surface Crop Override, in the same section where the previous command is, thus restoring the surface to its original shape as long as it has not undergone many subsequent changes.

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