yeah autocad is very bad at 3d, dont know about mechanical desktop or
architectural desktop, but simple
plain autocad is very bad at it. I didnt tried extracting polygons, but
i tried exporting as obj, dotxsi every version
and none of them helped, mental ray just wont render. I even tried deep
exploration and did the same thing
the problem was the source .3ds from autocad, when i exported to dxf
from autocad, it worked. Normals was pointing
in the right direction, and mental ray renders fine.
the trouble was the weird polygons that the .3ds had. And im surprised
that persisted between format versions.
the thing is i wont use .3ds again from autocad.
javier wrote:
you push your points through an interesting set of programs. As far as
I know, Autocad has a really nasty way of defining polygons (if a poly
is triarangular it simply adds 2 points on the same spot in the poly
definition,im sure that does 'wonders' for normals).
There are a few things that you can always do when you encounter bad
geometry in xsi.
Extract polygons and freeze does a good cleaning job most times. If
you have stuff on your poly just run gator on the two and your
attributes will pass thru. Otherwise export and reimport thru dotxsi,
obj or whatever. The trick is that if something gets corrupted, the
export import usually does not understand corrupted parts and hence
not exporting, cleans them. That 4.2 did not suffer but 5.0 did, might
be more serious, and perhaps worth a look; If extracting polys does
not work perhaps you should send support the MTT files.
j
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