X3D: Extensible 3D Graphics for Web Authors 125 2.2.4.1. repeatS and repeatT The field repeatS indicates whether to horizontally repeat texture along the s axis, and repeatT indicates whether to vertically repeat texture along the t axis. 2.2.5. X3DTextureTransform2DNode type The X3DTextureTransform2DNode type implements the X3DTextureTransformNode interface defined previously, and is the base type for all node types that specify a 2D transformation of texture coordinates. X3DTextureTransform2DNode fields exactly match those defined for the TextureTransform node. 3. Node descriptions 3.1. Appearance node Each Shape node defines a single geometric object along with a corresponding Appearance. Several different kinds of material, texture or line and fill properties are possible, with each optionally provided as child nodes within the Appearance node. Material nodes are most commonly used, because Material provides a variety of ways to uniformly color an object and modify its shading. New since VRML97, the FillProperties and LineProperties nodes can modify the style used to draw simple colors, enabling dotted lines, hatch fills, and so on. A texture