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cmc3502
12-02-2009, 02:12 PM
I know this is a topic that is already here, but I cant really find the exact answer i'm looking for...

I am trying to bring in files from autocad to lightwave modeler... Any of the disc that come over, come over with 12 sides and not round and smooth like the autocad file is. Maybe theres an import setting that allows me to have them brought in with more sides so they appear to be smoother. Let me know what file to export as (maybe dxf 12 i've heard).

thanks

Amurrell
12-02-2009, 05:17 PM
I have brought DXF files in pretty well, but I have also had problems with disks and curves in other software packages that import these files. Back when I used AutoCAD, I remember that the circles and arcs were of the low poly type that CAD would interpolate on a screen refresh (it might be interactive now). After zooming, the once smooth shapes would be polygonal before refresh, is what I'm getting at. This way the software could keep memory low by keeping point/poly count low.

So I'm thinking this problem is due to the fact that LightWave has nothing that says these shapes should be any more smooth than how they were generated internally by AutoCAD, are are translating the shapes on a point by point basis. But that's just my opinion.

geo_n
12-02-2009, 11:11 PM
I haven't used autocad for a long time but there's two commands you need to do before export. You need to up the values for facetres and viewres commands if I remember correctly.

archijam
12-03-2009, 01:17 AM
Geo: that's your best bet.

You can also explode the solids prior to export to control the facets.

If you are having problems with 2d drawings, sometimes it is not a bad option to go via illustrator, since illustrator has quite nice line-simplify tools and mass editing (as well as DWG layers staying intact).

Also straight into modeler via LWCAD DXF inport ..

flashover
12-03-2009, 01:58 AM
Autocad use vector files for 2d export eps or ai and import in LW

biliousfrog
12-03-2009, 02:41 AM
I use one or both of the following - AcmeCAD and Illustrator

Often you can open directly in Illustrator but, over the years, I've found the most reliable method came from opening the CAD data in AcmeCAD, export to EPS. Open the EPS in Illustrator and export as an Illustrator .ai file (version 8). Import the Illustrator file into Lightwave via the EPS importer where you can adjust the curve interpolation if required, I leave it at the default value. Once opened in Lightwave merge points (m) and merge polys (shift+i) to greatly reduce the geometry.

AcmeCAD is a great application if you only need to view and export CAD files. It's reliable, lightweight and cheap. A free demo version used to be available which added some text across the middle...It's quite easy to get round that although the price is worth paying to stop going through that process.

http://www.dwgtool.com/cadconvert.htm

cresshead
12-03-2009, 06:59 AM
looks good...saved the link!
and at $99 is well priced too.:thumbsup:

http://www.dwgtool.com/images/acmecad-b5.gif
http://www.dwgtool.com/images/acmecad-b15.gif

cresshead
12-03-2009, 07:45 AM
interesting vid on autocad to 3d models
http://area.autodesk.com/3december/marion