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 CAD / Development / Macintosh / 138
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Subject: 
Could someone run a perspective mode test on ldglite?
Newsgroups: 
lugnet.cad.dev.mac
Date: 
Thu, 6 Jun 2002 14:16:46 GMT
Viewed: 
2085 times
  
While following up on the latest round of bug reports I noticed
this page.

  http://wind.prohosting.com/anoved/lego.shtml

Neat pics, but while viewing them I realized that all of the
perspective (non-orthographic) views displayed a lot of z-fighting
(underlying surfaces and lines bleeding through).  This also
used to happen in Mesa because of the default 16bit zbuffer.
I fixed it there by moving the znear and zfar clip planes closer
together if GL_DEPTH_BITS reports a value less than 24.  Perhaps
I need to do it for values less than 32 instead.  If I recall,
someone posted that ATI rage 128 used on the Macs posted a value
of GL_DEPTH_BITS = 24 when ldglite is run.  Can someone verify
this?

Also, could someone try some perspective mode viewing with these
command line settings to see if it fixes the bleeding?

  -z100 -Z2000 -J

If so, I'll make it the default in the code.  Or maybe I'll even
calculate the best settings on the fly.  This should be possible
with the l3 parser.  I think it already calculates a bounding box
for the model.

-z100 -Z2000 -J

Thanks,

Don



Message has 2 Replies:
  Re: Could someone run a perspective mode test on ldglite?
 
(...) This isn't a direct answer to your question, but one thing I noticed in LDView is that setting the polygon offset too high will result in some of the observed problems. In particular, the problem on inverse slope bricks of the pillar showing (...) (22 years ago, 6-Jun-02, to lugnet.cad.dev.mac)
  Re: Could someone run a perspective mode test on ldglite?
 
(...) GL_VERSION = 1.1 ATI-1.1 GL_EXTENSIONS = GL_APPLE_specular_vector GL_APPLE_transform_hint GL_APPLE_packed_pixel GL_APPLE_client_storage GL_APPLE_client_address_range GL_ARB_transpose_matrix GL_EXT_clip_volume_hint GL_EXT_rescale_normal (...) (22 years ago, 6-Jun-02, to lugnet.cad.dev.mac)

Message is in Reply To:
  Re: Some bugs with LDGLite
 
(...) Oh no, that's a real bug, and not just on the Mac. Thanks for finding it. The 'r' key switches between the l3 and the ldlite parsers. I could swear I disabled that key for LEDIT mode because editing requires the data structures provided by the (...) (22 years ago, 6-Jun-02, to lugnet.cad.dev.mac)

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