DWG Filesize - what is wrong?

[martin.folber]

Hello,

Currently we are working on big BIM infrastructure project, where cooperation with many different design companies is needed. The core task is to coordinate everything in DWG, because we have to work with both DWGs and DGN mostly. There are approx. 200-300 xrefs in 3D, the goal is to attach them to one master plan...

As is shown in attached zip file - the file sizes for the same part of the road are following:

Bentley Microstation - 3D Mesh - 3.3MB

Autodesk Civil 3D - 3D Generic Mesh - 1.7MB

Autodesk Civil 3D - 3D Solids generated from corridor - 33.3MB - this is our common output.

Why the same geometry in solids is almost 20x bigger? 

It is clear that size of memory matters...

Thanks

Martin

[sanith_parsi]

I don't understand why the file size is different but when i tried to look at the file to understand what's happening to it. 
i didn't find anything Stange  when i extracted i just used commands like AUDIT and PURGESTYLES  to look at the errors and unused layers.
errors were 0 and unused layers got deleted.
Later, the size of the file is  seems to be normal for me during extraction of the file from ZIP the size of 3d solids was around 18mb.

[MSchille-1994]

It's a known, troublesome problem that AutoCAD in general is a complete hog when it comes to data storage.  I've witnessed this several times when comparing .dgn and .dwg files with the same data.  AutoCAD still has programming in it from going back to Release 11 that had the old Side Menus.  I have heard on two occasions, from two different IT professionals that AutoCAD is simply a mess when it comes to software programming and functionality.

This doesn't help you probably, but anymore, with a drawing file with a Corridor, 33mb is nothing at all.  Ive got many drawings with corridors where the file size is well over 30 mb, and even up to 250mb.