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Dimensioning of As Built Points (3D) in Autocad  


FNG Member
Joined: 2 months  ago
Posts: 1
October 10, 2018 10:33 pm  

I have spent a lot of time trying to find an answer to this problem, unfortunately most of the solutions I have come across only resolve part of my issues.

I come from the layout side of things, as such I am the first to admit I am still learning some of the more technical aspects of survey.

I have been doing as built for rough openings that deviate from the approved drawings, in a perfect world this is a set of 15 window openings that slope back 7deg along the vertical plane and lean 4deg in the horizontal plane, along a radius wall.

All my data is collected in ground / grid coordinates. I have tried importing point data, as well as exporting the point data straight to a DWG, which more or less results in the same 3D polar orientations. The problem is I need to be able to dimension angles and distances along 3 axis. The only solution I have been successful with is rotating the 3D point / line data into a 2D face I need to measure then drawing a set of parallel lines in 3 axis as a "constraint" and further fine rotation until the lines converge leaving me with a actual 2D face then modifying the polar orientation to "flatten" the model.

While this works, having two axis angles make it difficult to get true (2D) face dimensions because if I don't "flatten" the face just right CAD will pick up both the angle I am trying to measure and the minuscule slope I didn't quite get turned out of the face and give me incorrect angles. 

I have to do it 3 times for every opening to get the angular and distance measurements I need in each face of the 3D wireframe model to be accurate. I have to be overlooking something, or going about this the wrong way because this is exceptionally labor intensive for taking dimensions. I'm happy to further elaborate if it will be useful.

Thank you, - Johnathan

500+ posts Member
Joined: 5 years  ago
Posts: 573
October 11, 2018 12:36 am  

I don't fully understand from your post what you are trying to achieve, are you are trying to create drawings of different elevations of a 3d facade survey? If so then you probably need to set your UCS (user co-ordinate system) in CAD to match the plane of facade you want to create a drawing of. I would usually do this by UCS-Object and then turn off all snaps and draft. You can then copy and paste this to a seperate drawing in WCS(World co-ordinate system) and you have 2d plans.

I currently use this method to extract elevations from point clouds.

1,000+ posts Member
Joined: 6 years  ago
Posts: 1319
October 11, 2018 3:33 am  

I think you should be viewing in the Orbit mode. You can rotate the dwg in any direction and use ortho snaps to make the measurements you need. know the difference between "di" commands and "cogodist". You can also explore and play with all the drawing settings to get the readouts you are looking for such as slopes, percentages, degrees, etc.

Professional Surveyor - MO, AR, KS, KY
sUAS Certified Pilot

5+ posts Member
Joined: 3 years  ago
Posts: 9
October 11, 2018 7:48 am  

have you tried splitting your autoCAD window in two? 

This way you can have two different "views" and a SCU on each one. From there you can measure angles in each view and therefore plot them. 

It should work for what you need. 


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