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# What Kind of Projection Is This?

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dery
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Post Options    Thanks(0)    Quote  Reply Topic: What Kind of Projection Is This?
Posted: 17.Oct.2019 at 21:29
Can someone please tell me what kind of projection (for example: isometric, dimetric, etc.) is this? (Please see below image for more detail)

Thank you

philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 08:52
Hello dery, I think it's a 3D point of view based on an isometric view modified so that to see better the different elements.
If you do some 3D work, take a "standard" isometric point of view then modify it to see better the object(s).
Launch the command DDVPOINT and see the angle : relative to UCS
If the object is tall then lower the "vertical" ( relative to UCS ) angle to see "inside" your object, 35.3° modified to 25° for example.
If the object is flat then increase the "vertical" ( relative to UCS ) angle to see "on top" of your object, 35.3° modified to 45° for example.

Edited by philippe JOSEPH - 18.Oct.2019 at 13:01
John Connor
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 17:18
I believe it could very well be a 2D isometric view using dimetric projection.
"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance."

philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 17:58
OK John and dery but I don't see equal the 2 angles "A" and "C".
If it's a 3D point of view
on a 3D object, how can we set the DDVIEWPOINT angles to have a good dimetric view ?

philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 18:10
In fact The angle "A" is greater than the angle "C" and you can check it for example by redrawing an object with a paper on your screen and measuring the angles or rotating that paper for a check on the other angle.
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 20:17
Valid for everybody : See the related CAD tip N° 4793:Dimetry - dimetric projection of AutoCAD 3D objects.
dery
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 20:38
 philippe JOSEPH wrote:OK John and dery but I don't see equal the 2 angles "A" and "C".If it's a 3D point of viewon a 3D object, how can we set the DDVIEWPOINT angles to have a good dimetric view ?

That's why ask the question because it does not look like an isometric projection to me.
dery
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 20:41
 John Connor wrote:I believe it could very well be a 2D isometric view using dimetric projection.

What do you mean by "2D isometric view using dimetric projection"? I don't understand. Do you mean the projection is combined? Clearly it can be seen that the drawing is not isometric projection.

Edited by dery - 18.Oct.2019 at 20:46
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 18.Oct.2019 at 22:39
Dery, if you do a search on the internet you will find the various projections : isometric, dimetric with their diffrerent settings on the angles and length ( dimetric = 2 angles and length are equal, isometric = 3 angles and length are equal ).
The drawings are not isometric and not dimetric but from a 3D point of view ( isometric modified to see better the elements ).
Is your work 2D or 3D, I hope it's 3D because is now less work than the old way to draw.

Edited by philippe JOSEPH - 18.Oct.2019 at 22:46
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 19.Oct.2019 at 08:08
And the answer is : ........................................................................ TRIMETRIC...........................................................