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Hi John,
Thank you for that!
Haven't seen your reply with the download link, sorry about that.
So worked on with what I had at hand.
As the designer of the file didn't sent a reliable obj file upon further, specific request, just this cluttered mess of a dwg.
In reality it was a design of a waterpark slide.
There was a separate file for the slide and for the steel structure.
Yesterday I split/batch exported the dwg of the slide to separate dwg-s by each layer, then batch imported 1000 dwg-s into 3dsmax.
Exported the result as 20 separate obj files, that I imported into blender to join them together and remove doubles.
Today, worked on the steel structure in a different way.
Opened it in 3dsmax first -started opening at around 9:50 am and it opened fully around 1:00 pm.
Then exported it to an obj, which only took 2 minutes.
Opening it in blender, removing doubles -ending up with a file of 137000 faces.
The main target tool was archicad. It takes downloading a goodies extension pack from graphisoft to be able to import 3ds files...
so the target format had to be 3ds.
Then learned that there is a 64000 max face limit for models to be saved as 3ds.
Added a decimate modifier in blender so now both half of the slides and the steel structure is built up only of 60000 faces.
You can imagine how horrible it looks -topology is off, faces are missing, non-manifold everywhere.
Tomorrow I'll continue the following route -opening a dwg file made from batch importing the remaining exported dwg-s from yesterday with 3dsmax,
exporting it to obj and processing the obj in blender.
I assume 3dsmax can do the same as blender however I'm not familiar with max's functionality. Had only ever used it for a day some 15 years ago?
All in all the flaw was relying on simple functionality that can process layers in small numbers -theoretically autocad can merge layers the first place-.
Then, batch exporting was a life saver -or was it. If one can wait 3dsmax to import a dwg file, it's pretty easy further on.
So probably modifying the codes of the batch exporter autolisp file could serve as a middle ground -splitting a dwg to separate ones with a set number of layers.
Best would have been if autocad offered a way to export obj files. Somehow exported fbx files are outdated and not compatible with blender, and, judged by the other experience autocad would hang upon saving.