Yes 3dfx voodoo3 2000.
The wireframe was drawn as triangles (GeometryInfo.TRIANGLE_ARRAY).
PolygonAttributes style set to POLYGON_LINE. The rest of the scene is
drawn with filled triangles, but this one set of geometry is unfilled.
If necessary, I could make a test app to narrow down the problem.
I believe if I make the polygons filled, it would display correctly.
The problem seems like the trapezoid (which is being formed by clipping
the triangle) is itself being tessellated into triangles, and the
resulting triangles are being displayed as wireframes.
-Lee
-----Original Message-----
From: Philip Taylor [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 18, 2000 1:59 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] J3D 1.2beta DirectX on Voodoo3
I do believe that 3dfx has fixed their 256x256 texture size limit with
cards
after Voodoo3.
bummer on the limit I agree, it forces itself into the art pipeline and
thats always a bad thing when technology dictates to the artists.
otoh they had the fastest texture loads, probably because they had to
since
with the smaller max texture size you had to do more loads.
re polygon clipping let me ask a few questions since I dont grok how
this
test was run.
again this was 3Dfx hardware?
was it each primitive drawn as lines ( in D3D-speak this is the
primitive
drawn as a LINELIST or LINESTRIP ), or was the entire scene drawn in
wireframe mode ( in D3D-speak this is changing fillmode from SOLID to
WIREFRAME )?
this probably makes a difference.
further, if the test could be re-run in solid fill mode and verify the
clipped polygon was observed to be visually correct, that would be
additional good data.
-----Original Message-----
From: J. Lee Dixon [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 18, 2000 10:12 AM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] J3D 1.2beta DirectX on Voodoo3
The 256x256 texture size limit on Voodoo cards surprises me. First, the
OpenGL driver has texture problems, now this. I had a pretty high
respect for Voodoo cards, now I'm thinking I should have gone GeForce,
but the Voodoo does have a nice price tag (got mine for $80).
Justin, I noticed that the 3dfx section on the J3D FAQ looks a little
old, especially with the 3dfx OpenGL driver texturing problem, the
256x256 limit, etc. Actually, your FAQ talks about Voodoo2. Is it time
to have a Voodoo3/4/5 section? Let me know if you need help writing up
a paragraph or two. I personally think that Java 3D/opengl is UNUSABLE
on the Voodoo3 since texturing is broken (see my 6/15/2000 post "HELP!
Java3D OpenGL running on Voodoo3 2000"), but that's my unasked-for
opinion. :-%
As for the polygon/FOV clipping problem, I understand that the triangle
gets clipped to a trapezoid, but it is obviously wrong to draw the
trapezoid wireframe instead of the original triangle. This doesn't
happen on my ATI Rage PRO, and I highly expect that it doesn't happen on
the other graphics cards.
Lee
J. Lee Dixon
Software Engineer
SAIC - Celebration, FL
[EMAIL PROTECTED]
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