<table bgColor="#ffffff" border="0" width="100%"> <tbody> <tr> <td align="left" cellpadding="10"> <a href="index.html"><img alt="DirectionalLight Diagram" title="DirectionalLight Diagram" border="0" hspace="10" src="DirectionalLightFigure.png" width="303" height="156" align="left"/></a> </td> <td> &nbsp;&nbsp;&nbsp; </td> <td> <p> Light nodes make the appearance of geometry visible and viewable in a scene. </p> <p> Lights illuminate geometry in a scene relative to the user's view. Lighting nodes include <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#DirectionalLight" target="X3dTooltips" title="X3D Tooltip">DirectionalLight</a>, <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#PointLight" target="X3dTooltips" title="X3D Tooltip">PointLight</a>, <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#SpotLight" target="X3dTooltips" title="X3D Tooltip">SpotLight</a>, and the active <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#NavigationInfo" target="X3dTooltips" title="X3D Tooltip">NavigationInfo</a> headlight (which points along the user's viewing direction). </p> <p> Environmental effects include <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#Background" target="X3dTooltips" title="X3D Tooltip">Background</a>, <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#TextureBackground" target="X3dTooltips" title="X3D Tooltip">TextureBackground</a>, <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#Fog" target="X3dTooltips" title="X3D Tooltip">Fog</a> and <a href="https://www.web3d.org/x3d/content/X3dTooltips.html#LocalFog" target="X3dTooltips" title="X3D Tooltip">LocalFog</a>. Each set of light nodes, NavigationInfo nodes, background nodes and fog nodes are bound on a separate binding stack, meaning that only one of each can be active at a time. </p> <p> The supporting <a href="https://x3dGraphics.com/slidesets/X3dForWebAuthors/Chapter11LightingEnvironment.pdf" target="X3dChapterSlideset">Chapter&nbsp;11 slideset</a> and course videos (<a href="https://www.movesinstitute.org/Video/Courses/X3dForWebAuthors/X3dForWebAuthorsVideo.html#11" target="X3dChapterVideos">NPS</a>, <a href="https://www.youtube.com/playlist?list=PLuSIsM-86sinCdhttlFIr5ZLBXRjzazWU" target="X3dChapterYouTubeVideos">YouTube</a>) for <i>X3D for Web Authors</i> are available online via <a href="https://x3dGraphics.com" target="_blank">X3dGraphics.com</a>. </p> </td> </tr> </tbody> </table>