Re: [JAVA3D] Compressed geometry problems. Puzzling...

[Adam Tegen]

I am using it to save to a file.  It does a LOT more than float conversion.  It quantizes positions, normals, and colors.  It performs connectivity compression.  Among other things.  I am using it to make a small file format.

 

Hope that clarifies.

 

Adam

-----Original Message-----
From: Discussion list for Java 3D API [mailto:[EMAIL PROTECTED]]On Behalf Of Shawn Kendall
Sent: Thursday, November 30, 2000 5:20 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] Compressed geometry problems. Puzzling...

I have a quick question about Compress Geometry.
In know that the memory/file footprint is reduce when using CompressedGoemetry.
The question I have is, what is the performance effect?  Does it increase performance, because there is less to process, or does it reduce performance because it has to do more work converting the compress data to regular floats/doubles?
Or neither? :-)
Thanks

Adam Tegen wrote:

00f201c05b18$474598a0$[EMAIL PROTECTED]" type="cite">

After hours of debugging I having quite figured it out yet.  However, if I call GeometryInfo.compact() I don't get the exceptions anymore.  The geometry seems VERY quantized to the point were the gaps between surfaces are very noticeable.  I tried turning the coordQuant to 16, but that made no difference.

 

Could anyone tell me exactly what compact() does, why it keeps the exception from happening and if it may (or may not) be responsibly for the coordinate distortion?

 

Thanks,

 

Adam

-----Original Message-----
From: Discussion list for Java 3D API [mailto:[EMAIL PROTECTED]]On Behalf Of Adam Tegen
Sent: Thursday, November 30, 2000 12:56 PM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] Compressed geometry problems.

Hello-

 

I'm trying to use compressed geometry for J3d.  On some of the input, it works just find, and on some of it, it dies.  I have reduced the problem to the following piece of code:

 

save(GeometryInfo geomInfo)
{

    try
    {

        GeometryInfo[] geomInfos = new GeometryInfo[1];
        geomInfos[0] = geomInfo;
        CompressionStream cStream = new CompressionStream(positionQuant, colorQuant, normalQuant,geomInfos);
        GeometryCompressor comp = new GeometryCompressor();
        CompressedGeometry compGeom = comp.compress(cStream);

        /*immediately decompress to test it and I SOMETIMES get an exception*/
        compGeom.decompress();

        /*...*/
    }
 }

 

here is the Exception:

 java.lang.IllegalArgumentException: GeneralizedStrip: strip ended incompletely

 at javax.media.j3d.GeneralizedStrip.toStripsAndFans(GeneralizedStrip.java:277)

 at javax.media.j3d.GeneralizedStrip.toTriangleStrips(GeneralizedStrip.java:423)

 at javax.media.j3d.GeneralizedVertexList.toTriangleStripArray(GeneralizedVertexList.java:299)

 at javax.media.j3d.GeometryDecompressorShape3D.addShape3D(GeometryDecompressorShape3D.java:288)

 at javax.media.j3d.GeometryDecompressorShape3D.decompress(GeometryDecompressorShape3D.java:161)

 at javax.media.j3d.GeometryDecompressorShape3D.toTriangleStripArrays(GeometryDecompressorShape3D.java:97)

 at javax.media.j3d.CompressedGeometry.decompress(CompressedGeometry.java:290)

Does anybody have a clue?  Is this a bug?

--
___________________________________________________________

Shawn Kendall               Full Sail Real World Education
Course Director             3300 University BLVD
Real Time 3D for Gaming     Winter Park FL 32792
[EMAIL PROTECTED]       http://www.fullsail.com
___________________________________________________________

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