Autocad Import Problem
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Hi everyone.
I have got a problem with Autocad Import in Sketchup.
Just think, I draw a square with Line ( L command )and then I did it Boundary ( Bo Command ).
I imported Autocad drawing in Sketchup. Then , When I want to Push/Pull it , I see : this square has got 2 equilateral triangle. Why ?Can you explain this. Is Sketchup create a surface automatic , When I import the Autocad Drawing?
Thank you.
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Hi Semih,
I don't know what happened in CAD but that face seems to be triangulated. If you turn on hidden geometry under the View menu, you will see the dividing line.Just erase it to get rid of it.
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Thank you for your answer.
Yes, When I turn on Hidden Geometry, I see one cutaway line.
But In my Autocad drawing, there is no line. So why Sketchup draw a cutaway line.
I dont want to do this.Can you try to it ? It is just square.
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I don't use CAD myself (unless I receive a file) although I have never seen this before (and these CAD files do not have faces when imported to SU either).
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Its because CAD is lying to you, just like SU does. CAD actually made 2 tirangles, but did not show the line in the middle because it knew you did not want 2 triangles, you wanted a square. So it hides the line. But upon exporting, it "triangulates" all faces. I think this has to do with maximum compatibility with other programs (maybe?). So when SU opens the file, it sees 2 triangles. What filetypes can you choose from on export from cad? It seems like some filetypes will export without triangulating the faces.
Chris
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Hi Semih, hi folks.
In the Import dialog window, click on the Option button and then check the topmost check box labelled "Merge coplanar faces" to avoid unnecessary triangulation.
Just ideas.
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@jean lemire said:
Hi Semih, hi folks.
In the Import dialog window, click on the Option button and then check the topmost check box labelled "Merge coplanar faces" to avoid unnecessary triangulation.
Just ideas.
Thank you for your answer.
I tick "Merge coplanar faces" and then I Import my autocad drawing , but same problem is go on.
I import just a square, but when I want to Push/Pull it, I see 2 triangles. I dont want to see this. I want to see 1 square. This is only one example.
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Semih, It is the nature of file transfer between Su and other CAD programs to exhibit what you are experiencing. If you think of this as a problem, you will be unable to understand and work with importing and exporting files from other CAD systems. It is probably the BO that is importing as two triangles. If you want a square (no surface), remove the BO, then import. If you want a square surface, remove the BO and change the square into a 3DFace then import. Of course, all of this only works with squares and triangles. More complicated shapes will import in other ways.
To help you understand, temp01 is a square polyline, temp02 a 3dFace, and your file a square (line) and BO. Rename to *.dxf and import into Su. If you do not place them in different places, they will be on top of each other. They are components and you must "edit component" before you can make changes to them. You can also edit the files with a text editor and see how the database is structured. Temp02 will not port into ACAD, it is a special dxf made for Su only.
Square polyline. Rename to Temp01.dxf and import.
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Hi Semih, hi folks.
Maybe the original geometry in AutoCAD is not coplanar, hence the triangulation cannot be avoided.
As a test, in SketchUp, use the Text Tool on the four corners of your rectangle. The default text are the coordinates of the point in X,Y,Z form. For example, if the rectangle is supposed to be lying on an horizontal plane, all Z values shall be the same. If they are not, you have a problem.
Push the precision to 0.000001 to be sure.
If there are any discrepancies, this triangulation is unavoidable. However, it can be easily fixed.
Post your model if possible.
Just ideas.
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I'm having trouble with the scale of .dwg imports, they insert at 12X scale. The same file will open correctly in AutoCAD, and VectorWorks and other programs. I am using SU6 and SU7, on Vista.
CAD_VMC4830.dwg => The extension dwg is not allowed. The file is from Kraftmaid.com, and cannot be uploaded on this Forum. Is it O.K. to put a .zip extension to upload the file? What extensions are allowed, The FAQ states that it is the moderator's decision.
Larry -
Hi Larry,
If it's 12x bigger, I guess originally it's inches and you import it as feet. When opening the Import dialog window, make sure to visit the "Options" (it's somewhere on the bottom right) and there set the units of the imported file - in your case I'm retty sure it should be inches. This is not automated so you always have to make sure to use the same units on import as it was drawn in CAD (although SU remembers the settings but one click is always worth making it sure).
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Gaieus wrote <<If it's 12x bigger, I guess originally it's inches and you import it as feet.>>
Thanks Gaieus, that's what it was, I should have guessed it. I usually have the 25.4 scale issues one way or another, and know what that is.
Thanks again, Larry -
Then I guess that's inches > Millimetres...
Sometimes I have the same problem - when I don't even know what the units of the original file were. Then this can be nothing else than trial and error; importing the stuff a couple of times until you are okay.
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