<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <title>GRASS Tutorial for nviz</title> <link rel="stylesheet" href="grassdocs.css" type="text/css"> </head> <body bgcolor="#FFFFFF" link="#0000DF" vlink="#006000"> <img src="grass_logo.png"><hr align=center size=6 noshade> <h1>NVIZ Reference Manual</h1> <hr width="100%" align=center size=4 noshade> <p> <a href="nviz_toc.html">CONTENTS</a> </p> <h2>Lighting Panel</h2> <p>The <strong>Lighting</strong> panel has options to control the position, color, and brightness of the lights. <strong>NVIZ</strong> uses a fill light and a main light. The fill light is a permanent dim white light directly over the surface. The main light controls the shading, which you adjust using the <strong>Lighting</strong> panel. As you adjust the lighting, a lighting model (sphere) appears on the surface and continually shows the effects of the lighting changes.</p> <BR><BR> <DL><DD> <img src="nvimg/panel/light.gif" alt="Light Panel" width="292" height="276"> </DD></DL> <BR><BR> <h3>OPTIONS</h3> <dl> <dt> <strong>Follow Viewpoint</strong></dt> <dd> Moves the light position with the view position (if selected). By default (off), the light remains fixed at the position set from the <strong>Lighting</strong> panel. <br><br></dd> <dt> <strong>Show Model</strong></dt> <dd>Draws the lighting model (sphere) in the viewer. The lighting model shows changes made to lighting parameters. <br><br></dd> <dt> <strong>Brightness</strong></dt> <dd>Adjusts the brightness of the main light. <br><br></dd> <dt> <strong>Ambient</strong></dt> <dd> Adjusts the ambient light associated with the main light and the brightness of the fill light. <br><br></dd> <dt> <strong>Height</strong></dt> <dd>Adjusts the main light height.<br><br></dd> <dt> <strong>Red</strong></dt> <dd> Adjusts the amount of Red in the main light. <br><br></dd> <dt> <strong>Green</strong></dt> <dd> Adjusts the amount of Green in the main light. <br><br></dd> <dt> <strong>Blue</strong></dt> <dd> Adjusts the amount of Blue in the main light. <br><br></dd> <dt> <strong>Position Box</strong></dt> <dd> Adjusts the main light direction. Click and drag the puck to change the light direction. The box annotations are <strong><em>N</em></strong>orth, <strong><em>S</em></strong>outh, <strong><em>E</em></strong>ast, and <strong><em>W</em></strong>est. <br><br></dd> <dt> <strong>Close</strong></dt> <dd> Closes the <strong>Lighting</strong> panel. <br><br></dd> </dl> </body> </html>
