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Help for isometric view

bespel
Advocate

Help for isometric view

bespel
Advocate
Advocate

Hi, it's a quite strange question.

My nephew has a problem for an homework. But i really don't know/understand

 

This is the case (has teacher want):

 

- create classic 3 orho views of a part (2d)

 

Then, the trick of the teacher, use some magic tool and convert these views in axonometrical views

I don't know much about that workflow, I work in 3d.

 

Clues:

- the nephew said that the teacher use some tool called " 3d point of view" in a "visualize" tab.

Then the teacher use some rotate tool at 90°, move some geometry, and then he obtained the isometric /axonometrical view.

 

As real detectives...can you rebuild that workflow and explain to me?

 

Thanks!

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Johanna_Esteban
Advisor
Advisor

Hello @bespel,

 

It's the first time I've heard something like this, however I'm going to review it.

 

Do you have the model in which you must work, something like an image to use as a reference, or is it a free choice?

 

These are isometric views from a 3D model (solid), they could have been manually drawn and projected between them, but until now there is no "master trick".

 

isometric views.JPG

 

I did the essay following your instructions and, the result goes against all logic.

 

My advice, draw the model (using creation and editing commands such as extrude, slice, union, substract, etc.) and from this get the views.

 

I will be attentive to your comments (or additional tracks) Emoticono feliz

 

 

Regards, 



Johanna Esteban

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leeminardi
Mentor
Mentor

@bespel  is your post due to intellectual curiosity or are you a Zamboni uncle trying to create a smooth path for your nephew?

If the former, the task of creating an isometric view from three orthographic views has been part of descriptive geometry classes for about 100 years. From the little you mention, it could be deduced that the task is simply that but instead of creating the views and isometric with a pencil and paper the student is expected to use AutoCAD but mimic 2D drafting techniques. The task of synthesizing the isometric image from orthographic views requires some skill and is not a process that has been made automatic via an AutoCAD command. With the advent of AI I am sure some such problems could be solved using AI or big data algorithms. In any case, I think some clarification is needed in what is given and what is to be produced.

Please note that orthographic views are a specific type of axonometric projection as are isometric, dimetric, and trimetric views.  In contrast, perspective and oblique views are not axonometric projections.

If your goal is to help your nephew with his homework I suggest you tell him to create the orthographic views and start the isometric (if possible) and then go and see the teacher. Teachers will usually be more receptive to help students who have made an attempt at a homework assignment before asking for help.

 

@Johanna_Esteban  I suggest you do a web search on the terms isometric and auxiliary views.   None of the views in the drawing you posted would be classified as an isometric view. 

lee.minardi
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Johanna_Esteban
Advisor
Advisor

Hello @leeminardi ,

 

You're right, they're not isometric, please forgive my huge mistake.



Johanna Esteban

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SEANT61
Advisor
Advisor

Why wouldn't this be considered an isometric view?Isometric.png


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May your cursor always snap to the location intended.

leeminardi
Mentor
Mentor

@SEANT61 , you got me!  Good call. The base at 45° threw me in my quick response. Apologies to @Johanna_Esteban

lee.minardi
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ChicagoLooper
Mentor
Mentor

The instructor is using a 3D object, such as a solid cube, to demonstrate how it can be viewed from different angles. When the cube is viewed parallel to the x,y plane, such as from directly above, the cube appears to be a 2-dimensional square. The same can said when viewed from the front and from the side, the cube's appearance is a 2D square. When the cube is viewed from an angle, such as the angle known as SW, you see the top, side and front all at the same time.

 

The ability to see three surfaces of the cube at the same time is an axonometrical view. The axonometrical views from a 3D cube are only possible when the cube is rotated around one or more of its axes to reveal more than one side. 

 

Can you get axonometrical views from an object drawn in 3D? Yes, of course. Can you get axonometrical views from an object drawn in 2D? Yes, you still can.

 

By drawing lines at appropriate angles, you can create a 2D drawing that appears to be a cube. This 2D representation of a cube is considered an axonometrical 'drawing.' Why? Because the drawing, which uses angled lines, is displaying more than one side.

 

Print a 2D isometric drawing of cube, then print a 3D isometric view of the exact same cube, lay the printed sheets on a desk and, in theory, you won't be able to tell them apart.

 

To efficiently deal with axonometric views, AutoCAD uses tools such as UCS, named views, and the magic tool you allude to, the Viewcube. (Enter Viewcube on command line to see the magic.)

 

Back in the day, prior to the invention of AutoCAD, this was the way to draw 3D, using angled lines in a 2D drawing environment. Today, AutoCAD has enhanced 3D creation through technology.  Whether isometric, dimetric or trimetric, the instructor is simply demonstrating how viewcube technology applies to axonometricals.

 

Chicagolooper

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