3D Drawing with AutoCAD - Section 8

37.9 Section

With Autocad we can perform the inverse operation: create 2D profiles from 3D objects. Although, of course, the function of the commands to section solid is not limited to that of generating those profiles. It could also serve to analyze (or demonstrate) the interior of an 3D model without necessarily decomposing, cutting or otherwise modifying it. In addition, apart from the profiles, we can create 3D blocks equal to the applied section.
In any case, we must draw a section plane, place it in the model to cut it in the desired way and then activate the Auto section button, so we can see the sectioned model. We can even move the section plane in various ways with the gizmos and Autocad will present the sectioned model in real time. Let's look at all these operations.

37.10 Model documentation

One of the most outstanding novelties of the 2013 version is the so-called “Model Documentation”, which allows generating the various views of a 3D model in a presentation from the selection of a base view.
This theme, of course, connects directly with the creation of presentations for printing, but its execution can only be done using 3D models created with solids or surface objects (not with mesh objects), so it was necessary to see it in This point of the course. In addition, to automatically create the different views of an 3D model for printing it is not necessary to use graphic windows, as we saw in previous chapters.
The process begins with a new presentation sheet to which you have to eliminate the graphic window that, by default, presents the model space. Then we must define the base view from which the views of the model space we want are projected: Isometric or orthogonal (upper, posterior, lateral, etc.). These projections are associative to the model, which means that they can not be edited in themselves, but they will automatically reflect any modifications we make in the model space. Finally, from the projected views themselves, we can easily generate detailed views of any of its parts.
All of these options are in the Create View section of the Presentation tab, but as always, a video will allow us to display these functions clearly.

37.11 Cleaning of solids

During the editing of a solid it is possible that some faces may become coplanar. That would imply that on that face of the solid there is one or more unused edges, faces and vertices. Or, you may also want to remove from the face a solid embossed edges as we saw a bit higher.
To eliminate all that redundant geometry of a solid we use the Clean command and like other cases, simply select the command and designate the solid on which it is going to be applied.

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