# Axonometric Projections (Dimetric & Trimetric)

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Searching for this stuff online doesn't yield a lot of results, especially when it comes to AutoCAN'T. However, if you've wanted to have Dimetric and Trimetric projection views, here you go.

This requires using DDVPOINT to set your angles and also saving it as a model view. The format below is [View Direction] - [From X Axis] - [From XY Plane]

• Dimetric Views
• NE - 45 - 15.5
• NW - 135 - 15.5
• SW - 225 - 15.5
• SE - 315 - 15.5
• Trimetric Views
• NE - 62.5 - 31.5
• NW - 117.5 - 31.5
• SW - 242.5 - 31.5
• SE - 297.5 - 31.5

If anyone else has a different way of doing this, please share your methods.

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Searching for this stuff online doesn't yield a lot of results, especially when it comes to AutoCAN'T. However, if you've wanted to have Dimetric and Trimetric projection views, here you go.

This requires using DDVPOINT to set your angles and also saving it as a model view. The format below is [View Direction] - [From X Axis] - [From XY Plane]

• Dimetric Views
• NE - 45 - 15.5
• NW - 135 - 15.5
• SW - 225 - 15.5
• SE - 315 - 15.5﻿
• Trimetric Views
• NE - 62.5 - 31.5
• NW - 117.5 - 31.5
• SW - 242.5 - 31.5
• SE - 297.5 - 31.5

If anyone else has a different way of doing this, please share your methods.

Is there something special about these dimetric and trimetric views?  All that a dimetric view requires is a from the x-axis value of 45, 135, 225, or 315 AND an angle from the XY plane of anything greater than 0° and less than 90°.  However, if the angle is 35.2644° you get an isometric.

Trimetric projections are just any x axis direction other than 0, 45, or 90 and any angle from the XY plane except 0 or 90.

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17 minutes ago, lrm said:

Is there something special about these dimetric and trimetric views?

Nope. Use whatever angles you want. I'm just posting this because there aren't many (if any) posts anywhere that tell you how to set this up. I just like having the presets because I've used these views in SolidWorks and wanted them available in AutoCAN'T.

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Hi,

I am a newbie here, this is my 1st post and excuse me for my English!

I use to create 2D objects/drawing from 3D solid modeling, my interest axonometric project with known scale raitio for the reason that I can change or update on the fly later.

The point here is create a view point in space via " DDVPOINT" then use "FLATSHOT" to create 2D drawing.

if you are interest in create axonometric 2D drawing from 3D solid in AutoCAD let me know!

Phong

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Compile lisp file for setup DDVPOINT to create view point as samples shown above

avp.fas (axonometric view point)

at command prompt type "avp"

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Dimetric projection with known scale ratio is actually benifit, manipulate or edit dimetric object/model is preditable since known scales.

Regarding scale axes ratio the most common are:

1, 1, 1/2

1, 1, 2/3

1, 1, 3/4

In AutoCAD to setup viewpoint for axes with scale 1, 1, 1/2, at AutoCAD command :

`(vl-cmdf "_vpoint" '(1.0 -2.64575 1.0))`

For axes with scale 1, 1, 2/3, at AutoCAD command :

`(vl-cmdf "_vpoint" '(1.0 -1.87083 1.0))`

For axes with scale 1, 1, 3/4, at AutoCAD command :

`(vl-cmdf "_vpoint" '(1.0 -1.59861 1.0))`

Then use "Flatshot" to produce 2D dimetric view.

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Regarding previous post

The second element in "vpoint" command, here are formulas for calculate exact:

(1.0 -2.64575 1.0)

2.64572 = (sqrt 7.0)

(1.0 -1.87083 1.0)

1.87083 = (sqrt (/ 7.0 2.0))

(1.0 -1.59861 1.0)

1.59861 = (sqrt (/ 23.0 9.0))

Zoom scale factor after using flatshot to get object match drawing unit scale

Formula for compute scale ratio = sqrt (0.5 * ((x*x)+(y*y)+(z*z)))

For axes with scale factor 1,1,1/2

(sqrt (* 0.5 (+ (* 1.0 1.0) (* 1.0 1.0) (* 0.5 0.5))))

For axes with scale factor 1,1,2/3

(sqrt (* 0.5 (+ (* 1.0 1.0) (* 1.0 1.0) (* (/ 2.0 3.0 ) (/ 2.0 3.0 ))))

For axes with scale factor 1,1,3/4

(sqrt (* 0.5 (+ (* 1.0 1.0) (* 1.0 1.0) (* 0.75 0.75))))

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