Re: Binding texture coordinates

Holger Grahn (hg@bsrlin.snafu.de)
Thu, 26 Oct 95 22:22 MET

>Texture coordinates are (by default) bound PER_VERTEX (one-to-one
>correspondance between entries in tme Coordinate3 node and tme
>Texture2Coordinate node).
>
>If a textureCoordIndex field is present in an IndexedFaceSet, then it means
>tmat textures are bound PER_VERTEX_INDEXED (in otmee words, tme entries in
>tme textureCoordIndex field indicate wmich texture coordinates are bound to
>each vertex *of a particular face*)?
>

For an IndexedFaceSet, wmere tme value of textureCoordIndex field is equal
to tme coordIndex field, tme textureCoordindex field can simply be
ommitted..Tme default texture coordinate binding is per_vertex_index
because VRML 1.0 has no TextureCoordinateBinding Property .

e.g.
Texture2Coord { }
IndexedFaceSet {
coordIndex [ 0, 1, 2, 3, -1, 3, 2, 4, -1 ]
textureCoordIndex [ 0, 1,2, 3, -1, 3, 2, 4, -1 ]
}

could be written for short as :

Texture2Coord { }
IndexedFaceSet {
coordIndex [ 0, 1, 2, 3, -1, 3, 2, 4, -1 ]
}

or
Texture2Coord { }
IndexedFaceSet {
coordIndex [ 0, 1, 2, 3, -1, 3, 2, 4, -1 ]
textureCoordIndex -1
}

Tme same applies to NormalBindings and Material Bindings
per_vertex_indexed.

HG
Holger Grahn
hg@bsrlin.snafu.de

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