[Plugin] Dxf_In v2.2 20110517 Dxf2Skp
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I have downloaded the DXF-file from the Internet.
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The basic arcs, have been corrected, but the Dxf contains entities currently unsupported by "Dxf Import". Until these are added, along with support for "nested block(s)", only the most basic geometry, will be imported. If necessary, the unsupported entities can be exploded into supported entities prior to being imported into SU.
I have been unable to test "basic block(s)" except in the simplest cases. If I can get a Dxf with "BLOCK" and their related "INSERT" entities (not INSERT(s) inside a BLOCK) to test, I will then be able to check them. I need someone to post a Dxf with a pair of BLOCK(s) made in Acad as illustrated below.
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Hi Honoluludektop,
I'm sorry that i cant help you with a real acad dxf ,but would'nt a dxf created with the free doublecad http://www.doublecad.com/LinkClick.aspx?link=http%3a%2f%2factivate.imsisoft.com%2fdoublecad.aspx%3fproductpage%3dDoubleCAD_XT_v2&tabid=1128&mid=3384
do the same.Thanks for your effort ,and i wish you succes
,Bep
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I am not fluent in that app, and failed to take a component into it as a block, and back as a group/component with the original entities preserved. But if you build the model in DoubleCad, and save as a Dxf, I can give it a try. By inspecting the DXF, it is possible to see if the entities are preserved. Thanks.
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thank you very much!
I will try it asap and let you know if it works fine with my CAD programs (I'm still with SU 7.1 BTW)cheers,
Alessandro -
Beta release v0.50 includes LWPolylines, group names, and some fixes. The following image is the bathtub dxf previously provided.
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Alpha v 0.45 includes support for Blocks2Groups. Charley, while still missing lwpolylines and ellipse, arcs are resolved, and blocks accomodated in the current release, (I hope:-). Bep, translators are not equal. One app. may elect to export circles as connected edges, in other situations, SU may have, or not have a high level entity that a Cad app supports, so....Sigh!!!!, several situations need to be tested for.
Acad has more entities then I thought possible. In the process of supporting blocks, I discovered polyface meshes. The following is one of 6 variations in this category. In this release blocks2groups is addressed. I would still like to get a Acad created Dxf of a cube, and drum represented as faces.
Anyway, if "NO" to convert polyline to faces is selected, the above is created. It is a way of representing a 3d object with polylines, taking the least amount of space in Dxf.In most cases, selecting OK, to a error message, allows you to proceed. In some cases, this is taking too much time, and needs to be accommodated
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Except for polyface mesh, Dxf_in v1.0 imports the basic geometric entities recognized by SU.
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Looks great! I ran it through a test with some DXF's created by EnergyPlus (as part of an energy simulation run).
What I noticed is that using your plugin the DXF came in 12x smaller. In the Pro I have units set to feet vs. inches, which works with these DXF's. Easy enough for the user to fix but could be nice option to add down the road. One other thing I noticed is that on your DXF import a few faces were reversed from how there were with the pro importer. The pro importer was not set to "orient faces consistently" but maybe it was doing it anyway, and the source file really does have some reversed faces.
Other features that would be nice, but aren't critical, are to support the layer and color applied to a face.
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David, Thanks. Can you provide a sample dxf (smaller the easier for me) with layer and texture? Perhaps I should provide a options menu.
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@honoluludesktop said:
David, Thanks. Can you provide a sample dxf (smaller the easier for me) with layer and texture? Perhaps I should provide a options menu.
Sure, here is a 50k file from the example above. Now this was made from EnergyPlus, so it may not be the best test case since it wasn't generated by AutoCad. I'm not sure if a similar file from Autocad would like the same or not.
This file has layers and color (not image textures)
(hmm, can I not upload DXF file?)
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you can download lot's of dxf files from here (my google site.) The .zip contains an un-attributed compilation of shared .dxf files designed as 2D cnc routing patterns. (17MB)
I'm wondering, do you know how to handle the bulge data when it appears in the lwpolylines? It's something I'd like to add to my importer, too.
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I made dxf (and dwg) an attachable file extension
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Jim, Thanks, I will take a look at your files. Is lwpolyline something that is required by a lot of modern applications? I found the following, but bulge remains unimplemented with my importer:
"The bulge is the tangent of 1/4 of the included angle for the arc between the selected vertex and the next vertex in the polyline's vertex list. A negative bulge value indicates that the arc goes clockwise from the selected vertex to the next vertex. A bulge of 0 indicates a straight segment, and a bulge of 1 is a semicircle."
DXF is on the other side of the moon when compared with SUs faces, and edges. I initially made Dxf_In work for my own Cad application, then added features as others have requested. Initially, by self imposed discipline, all of my cad models were built with 3d faces, and blocks. My Cad2Dxf2Su requirements were simple. But times change, and while my code is fairly well organized to implement new entities, it needs work on the overall DXF structure. Something I ignored since I was only interested in geometry.
Gai, Great. Perhaps, like a lot of others, I only learned how to "send to zip" once I needed to do it.
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Just change the file.extension name to .txt, or right click, sent to .zip first. Thanks
Addenda: See post by Gai below.
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Here is the attachment. Thanks for the tips. I left the file at work, so couldn't send last night. Sounds like we can do dxf's now.
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Looking at the Blender dxf importer (written in Python) and found these dxf test files in the Downloads section:
http://wiki.blender.org/index.php/Extensions:2.4/Py/Scripts/Import/DXF-3D
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V1.2 provides the option to select input units, and location (thanks to_tt). Not being familiar with metric conversion, I did not check their accuracy.
Btw: In regards to lwpolylines, when I wrote this translator, I found that the dxf example I used contained occasional differences in the actual number of vertices's, and the number provided by the dxf. So, I ended up writing a procedure that did not depend on the stated number. I am not sure if this is a misunderstanding on my part or a bug in the program that created the dxf. -
Sigh...As soon as you think you got it, there is something to change, hence v1.1. Functionally no different, but with better error messages. Unless I find a bug, or figure how to add a polyface mesh, this should be it:-) Attached are some test with old.dxf models.
The model's groups are based on common materials, textures, or colors. This makes it is easy to update the SU model's textures of any Cad based revision. The groups/blocks are sent both ways so that the production drawings are easily revised based on changes to the model. -
@honoluludesktop said:
Btw: In regards to lwpolylines, when I wrote this translator, I found that the dxf example I used contained occasional differences in the actual number of vertices's, and the number provided by the dxf. So, I ended up writing a procedure that did not depend on the stated number. I am not sure if this is a misunderstanding on my part or a bug in the program that created the dxf.
I can't find the reference now, but I understood it to say something similar to "polylines that can be converted to lwpolylines, are converted into lwpolylines in order to save space."
I have a routine to handle the bulge data for regular polylines, but the lwpolylines are different enough that I haven't been able to decipher them consistently.
I found a dwg/dxf converter for Windows that may be of interest. It converts between dwg and dxf, but also from dxf to dxf and you can choose several versions of the file format. So maybe it will be useful for converting tricky dxf files into older formats which your importer is more tolerant of.
The converter is here, under the name ODA Teigha File Converter.
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