21-8. AutoCAD MODELING LOFT 3D Model

How to draw a transition from one object to another object in AutoCAD?

Modeling Toolbar - Draw menu - Modeling Loft



The LOFT command on the MODELING toolbar serves to draw 2D drawings or 3D models, which has an irregular shape and can be joined by two nonlinear POLYLINE or regions that are not planar. (eg: when you want to connect two Polylines to a 2D drawing or for example: two semicircles or squares in a 3D model of an irregular shape.
You can also run Command in Command Line Prompt => LOFT

Conditions for working with the LOFT command are as follows:
  • - All lines must be drawn with the POLYLINE command (or if you draw regular lines then you must connect them to a single Polyline.)
  • - Two objects that merge with this command must not be in the same plane (plan as A4 paper) because they will not be able to connect.
In this example, I will connect two objects that are not in the same plane. The first object is a semicircle and a second wavy Polyline.
The red on the drawing is a path that will connect these two objects.
LOFT in AutoCAD example step1




I immediately remind you to pay attention to Active Layer and its color. After executing the command, the drawing will be in Layer that you set as active (not default).When we prepared the objects to connect, you need to click on the button for the LOFT command. The mouse pointer is transformed into a small square and now needs to click on the first object, which is our semicircle and click on another object and it is a wavy Polyline. Notice that in the Command prompt, you now have a question as to how you will make these two objects merge. I did it over Path, so type "P" without a quotation and click on one of the red lines because it's the path to which our objects will connect.

Command: _loft
Select cross-sections in lofting order: 1 found
Select cross-sections in lofting order: 1 found, 2 total
Select cross-sections in lofting order:
Enter an option [Guides/Path/Cross-sections only] <Cross-sections only>: P
Select path curve:
Command:

So our drawing now looks like this in the picture below
Wireframe Drawing after applying the LOFT command


Or if we look at Realistic View it looks like this

Realistic View applyed on 3D draw in AutoCAD


How to draw a transition from 2D draw to 3D model in AutoCAD.
How to from 2D to 3D in AutoCAD


If we want to draw a 3D object with a transition we can do this in the following way. Take for example, as in the picture below, where we have two REGIONS (squares and circles). You must be a region if you are creating a 3D model.

Do the same as in the previous example with the LOFT command.

Command: _loft
Select cross-sections in lofting order: 1 found
Select cross-sections in lofting order: 1 found, 2 total
Select cross-sections in lofting order:
Enter an option [Guides/Path/Cross-sections only] <Cross-sections only>: P
Select path curve:
Command:
3D model in AutoCAD

3D draw realistic view in AutoCAD


And of course, if you reduce both objects and make another 3D object, you can SUBTRACT one from the other and get this hollow 3D model.
Hollow 3D object

View Realistic in Acad


Also use the ISOLINES command for quality lines in the quality view and use REGEN in the Command Prompt to refresh.

And finally another example of how we can make a transition from one object to another object.


LOFT command in AutoCAD

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