Re: [JAVA3D] IndexedGeometryArray

[Michael Nischt]

thanks a lot,
now everything works fine..


I thought the following would be sufficient for indexed-geometry, probably therefore I was confused:

For indexed geometry we propose to create new initialIndexIndex and validIndexCount attributes. The following must hold:

initialIndexIndex + validIndexCount <= indexCount

(since by-ref and by-copy applies to the vertex data, not to the indices, the above holds for both by-ref and by-copy).
In addition, the following methods will be overridden and will throw an UnsupportedOperationException: setInitialVertexIndex, setInitialCoordIndex, setInitialColorIndex, setInitialNormalIndex, setInitialTexCoordIndex and setValidVertexCount. These will become immutable attributes.


greetings
 -Michael Nischt



Chien Yang wrote:

[EMAIL PROTECTED]">

Michael,

        Your setup fails in the second condition of the Valid vertex ranges
check.

Valid vertex ranges :
For geometry by-reference, each non-null vertex component must satisfy
the following:

         initialARRIndex + validVertexCount <= vertexCount
         ARR.length >= nWords * (initialARRindex + validVertexCount)

where ARR refers to one of the coord, color, normal, or texcoord arrays,
while nWords is the number of words per vertex for the particular type of
array. This implies that the lengths of the separate arrays of components
need not be the same (this can be particularly useful for indexed geometry).

Hope this helps.

- Chien Yang
  Java 3D Team.

Date: Thu, 07 Mar 2002 15:29:55 +0100
From: Michael Nischt <[EMAIL PROTECTED]>
Subject: [JAVA3D] IndexedGeometryArray
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X-Report-Abuse-To: [EMAIL PROTECTED]hi there,I thought since j3d beta the VertexArray's length needn't to be equal -only the length of the IndexArrays must.but follwowing code: int vertexFormat = IndexedTriangleArray.COORDINATES |IndexedTriangleArray.NORMALS                         | IndexedTriangleArray.TEXTURE_COORDINATE_2                         | IndexedTriangleArray.BY_REFERENCE;        triArray = new IndexedTriangleArray(coords.length / 3,vertexFormat, coordIndices.length);        triArray.setCoordRefFloat(coords);        triArray.setNormalRefFloat(normals);        triArray.setTexCoordRefFloat(0, texCoords);        triArray.setCoordinateIndices(0, coordIndices);        triArray.setNormalIndices(0, normalIndices);        triArray.setTextureCoordinateIndices(0, 0, texCoordIndices);thro

ws:Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException:GeometryArray: texture coord array length is incorrect        at

javax.media.j3d.GeometryArrayRetained.setTexCoordRefFloat(GeometryArrayRetained.
java:8766)

        at
javax.media.j3d.GeometryArray.setTexCoordRefFloat(GeometryArray.java:5368)
        at test.GeomIO.load(GeomIO.java:224)

with:
coords.length      = 2418
normals.length    = 2438
texCoords.length =  956

and all IndexArrays are at: 2337


without texCoords (though normals.length != coords.length) everything is
working correct, so I'm asking mtself what i have done wrong ?


btw. why I still have to set the vertexCount for IndexedGeometryArrays ?


greetings
 -Michael Nischt

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