I asked one of our internal graphics gurus about this faceting issue because
(as suggested) it doesn't have to do with your graphics card and does have
to do with the part. Here is what was posted in 2006:
When you first open a Part in an Assembly view, we rely exclusively on the
stored faceted representations (equivalent to 1/2 pixel and 8 pixels chordal
tolerance @ 1000 pixel screen size) for both on-screen display and Inventor
Studio rendering.
The finer of the two versions (1/2 pixel @ 1000 pixels) means that the
straight lines that approximate curved edges deviate from the true curve by
no more than 1/2000 of the extent of the whole part. For a large part like a
long pipe with small holes, this can make the holes look pretty rough.
If you do anything that causes the B-rep (the underlying precise
mathematical boundary representation of the Part) to be loaded, we refacet
as needed to keep to the on-screen tolerance requested on the Tools >
Application Options > Display tab, DisplayQuality: smooth = ½ pixel, medium
= 1 pixel, coarse = 3 pixels, so if you zoom in on a small section of the
part, we will refacet it to look good at that zoom.
To get B-reps to load usually requires doing something like editing the
Part. (We try very hard NOT to load B-reps otherwise, to keep memory from
filling up with things you're not working on.)
In R11 there is a registry setting that tells Inventor to go ahead and load
B-reps just for the purpose of doing finer faceting whenever the Display
Quality is set to "Smooth" (see above). In
HKEY_CURRENT_USER\Software\Autodesk\Inventor\RegistryVersion11.0\System\Preferences\Display
"Faceting Options"
change this value from 0x00000042 to 0x00010042
Do this when Inventor is not running.
Now, run Inventor and set the Display Quality to "Smooth". Then, open your
assembly and zoom in on the end of a pipe - it should (after a bit of
thinking), look smooth. When you don't want to spend the extra time
refaceting, set the Display Quality to "Medium".
Inventor Studio inquires the available set of facet levels of detail (LODs,
not to be confused with Assembly LODs) through the API and chooses the
finest available one for its renderings. However, the API only returns LODs
which are "complete", meaning there's a faceted rep for EVERY face in the
Part. If you've zoomed in on the Part, we have only faceted the faces in the
current view, so that new LOD is probably not complete. So, Studio may end
up getting a coarser LOD than what you see on screen. The Inventor Studio
developers are aware of this issue.
To get around this issue, rotate the zoomed in view so that any parts
suffering from this effect (like your long pipes) lie completely in the
window - i.e. look at the pipe end-on. After that, you can reorient the view
as desired for rendering and your Studio renderings should have smooth
faceting, just like the on-screen display.
BTW -- None of this is affected in any way by your graphics card or driver.
http://discussion.autodesk.com/adskcsp/thread.jspa?messageID=5395435叫
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