Subject:
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Re: fixes??
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 7 Jun 1999 06:55:06 GMT
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Viewed:
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756 times
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Luckily, you have access to the LDLite source code.
And it is the following lines near the top of stub.c:
// replace pixels within tolerance to avoid rounding problems
#define Z_LINE_TOLERANCE 2
// move lines closer to viewer before drawing to avoid rounding problems
#define Z_LINE_OFFSET 3
The z values are in 1/16ths of an LDRAW-unit. The Z_LINE_TOLERANCE
is used in case one line is drawn exactly over another, so we make
sure the entire line is replaced rather than some moire pattern
due to rounding. The Z_LINE_OFFSET works like the "Polygon
Offset".
Playing with these values makes some models look better at some
resolutions and angles. I typically adjust these so that the
file m928.dat by Steven "Wombat" Walter at the standard view
looks the best. Maybe these need to be tweakable?
-gyug
Leonardo Zide wrote:
>
> Steve Bliss wrote:
> >
> > The problem is the primitive stud*.dat files are specifying two different
> > colors for the same voxel (3D pixel)--the voxels are the edges are being
> > filled with both the edge color and the surface color. So the renderer has
> > to 'decide' which color to use.
> >
> > Without making drastic changes in the LDraw language, there's not much that
> > can be done. If the edges are 'cheated' (moved slightly above the surface
> > so they will alway be drawn), they will appear to float above the surface
> > at high resolutions.
>
> You don't need to change anything in the LDraw language, you can use
> something called "Polygon Offset" (those who have used OpenGL will know
> what I mean), it moves the lines a little bit to the front when checking
> the Z-buffer. You'd just need to have access to the LDraw source code to
> change that... :)
>
> Leonardo
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Message has 1 Reply:
 | | Re: fixes??
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| (...) Did you get the changes to the way LDLite saves bitmaps that I submited about 2 months ago ? You haven't told me anything. Leonardo (25 years ago, 7-Jun-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: fixes??
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| (...) You don't need to change anything in the LDraw language, you can use something called "Polygon Offset" (those who have used OpenGL will know what I mean), it moves the lines a little bit to the front when checking the Z-buffer. You'd just need (...) (25 years ago, 2-Jun-99, to lugnet.cad.dev)
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