Hi,
Why would a 3D DWG export be a lot bigger if exported in mm than in inches? On this particular file it’s a 33 vs 96MB. Do the bigger mm numbers take up that much more space?
Thanks,
Jim
Probably because of the export scheme creating smaller arcs and lines in mm’s rather than it would in inches.
Hmm that could be it, though there are no curves to convert in the file, it’s all surfaces?
Are the surfaces being exported as meshes? The meshing parameters for mm vs inch might make the difference in that case… Just a random thought… --Mitch
They’re supposed to be exported as surfaces…,
OK, dunno then… did you re-import each and inspect to see if there is a visible/detectable difference? --Mitch
I see some surfaces get converted into polysurfaces, but the results seem similar in either case. Funny…
Hi Jim - are there more faces, overall, if you export to mm than inches?
-Pascal
Hi Pascal,
No “faces,” exporting as solids.
Jim
Right, but you said, above, that the surfaces are converted to polysurfaces - I wonder if they are converted differently - with more faces in the resulting breps, one way compared to another, units wise.
-Pascal
There seem to be the same number of surfaces, but something obviously isn’t quite the same though…the surfaces getting changed are pipes.
Jim
It’s baffling, I’ve tried changing the curve parameters but (as expected since I’m exporting “solids”) it has no effect. If I have the Rhino file in Inch units then scale the model by 25.4 to export in mm, I get the same file size inflation.
I just tried in V6 and got much more similar (though not identical) results in inch and mm.