As a learning experience, I'm trying to create a wireframe drawing of the Great Pyramid of Giza. The image link to some 25 dimensions (in meters) is attached.
My problem seems to be where to start. They are all absolute lengths and fitting them all together seems an impossible task using endp osnaps.
I've tried to create all 25 lines in approximate relation to each other with some gap, then imagine I have a bunch of toothpicks on the kitchen table and stick the ends together by dragging handles on top of other handles.
I'm using v 2012.
Any tips?
Are you changing planes and using isometric drafting option? You should be able to use snaps and the drafting to connect?
Attached is a jpg image showing all the base lines in position and joined together. It also shows the vertical edges in suspension, poised to be connected. Dragging and snapping the grips together isn't the problem. Once they're together, however, the lengths are forced to change slightly, I suppose, to satisfy the geometry of the collective whole.
Remember, these were actual field measurements and the planes may not have been perfect, therefore their edges reflect that imperfection.
>>I'm trying to create a wireframe drawing<<
You mean in 3D Modelling or what exactly?
>>"My problem seems to be where to start..." "....I have a bunch of toothpicks on the kitchen table and stick the ends together by dragging handles on top of other handles"<<
You wish to have the lines connect to all other lines like in a polyline or what? Kindly respond to these Qs
As to 3d modeling, no -- as I stated in my original post, I am trying to learn wireframe modeling, not solid, surface, or mesh modeling.
In my AutoCAD 2012 Help,under headings Create Solids, Create Surfaces, Create Meshes, and Create Wireframe Models I chose the last and I am ignorant as to the other 3 methods.
Also, in AutoCAD 2012 Help, I chose the subject "Use Object Grips", then the video "Use Multi-Functional Grips to Edit Objects" where one can stretch, etc. by using the Grip method.
No, the lines are ordinary lines, not polylines.
I hope this helps.
@Anonymous wrote:
My problem seems to be where to start.
At first I would draw the eight triangles of the horiontal base (the ground) - sw/rw/wdtc, lw/rn/wdtc, rn/ndtc/nw and so on.
Then put all the triangles together (either move and rotate or - I'd prefer - using the align command). With the given 16 dimensions the geometry is overconstrained. Because the given dimensions are not exact it will not be possible to get a correct geometry. At least one of the dimensions is the result of the other 15 dimensions. You have to decide which of the dimensions you want to ignore. In the attached pic I ignored the given sdtc. But you can use also each other dimension - and will get of course different results. (Note: if we assume the the lines ls/rs, le/re, rn/ln and lw/rw are colinear then we have to ignore much more than only one of the given dimensions).
Now you can draw the line for the height (from the intersection in the centre to @0,0,146.3023).
At last you can draw 4 lines from the top end of this line to the corners of the base. You will se, that also the dimensions of nnw, ssw, sse and nne will not be exact the same as given.
Summary: The given dimensions don't allow to reconstruct the dimensions of the pyramid exactly.
Jürgen Palme
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Jürgen,
I am impressed -- and most certainly grateful for that solution.
"The given dimensions don't allow to reconstruct the dimensions of the pyramid exactly." Yes, I suspected this to be the case but could not think my way into an elegant compromise like you did.
I believe the person responsible for the field measurements did them in the 1920s and had no idea that someone would use them 100 years later. Again, thank you.
Len
Here is the process.. Switch to 3D Basics, make sure you stat with the Top view for the base with units in meters.
Since we do not have exact SW / NE Angles make sure to snap to the end points with all center lines drawn out first.
Then switch planes and make sure to use X & Y Axis instead of X & Z .
Here is what i got i would say > 90% match with the measurements and snap that had 0.000x precision off.
Let me know what you think and have any questions.
Thank you, Prasannac. Again, I am impressed and envious of your skills. I've got much to learn but I have plenty of time during retirement and the occasional drawing maintenance job locally.
Len
There are n number of ways to achieve any drawing in AutoCAD , there many permutations. I suggest if you really want to get a good head start there are really good & free tutorials out there just google . Even after 10+ years of experience you will still learn something new everyday. Message me if you need any help finding anything.
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