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With image textures, it is considered that it has a 2-D graph and x axis is called S axis and y axis is called as T axis.
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Texture image always extends from 0.0 to 1.0 in the S (x) direction and from 0.0 to 1.0 in the T (y) direction in the texture coordinate system.
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TextureCoordinate only has a point field and specifies a list of texture coordinates and may be used as the value of the texCoord field in the IndexedFaceSet and ElevationGrid nodes.
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This is "pointed to" by texCoordIndex field
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It is possible to give a point in a TextureCoordinate node which is outside of the texture image such as beyond the left, right, bottom, or top edges of the image.
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When wrapping (repeatS/repeatT) is allowed, coordinates above the top of the image wrap to the bottom of the image, and coordinates below the bottom edge wrap back to the top, and so on.
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When wrapping is not in use, it is called clamping. This mode is useful to make sure that a texture image occurs just once. Clamping restricts the texture images in the S, T, or both directions to lie in range 0 to 1.
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repeatS and repeatT fields of texture nodes specifies whether wrapping is on or off in the corresponding Coordinate.
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