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<h2>nviz - A GRASS Visualization Program</h2>
<p><img src="img/nv/inter1b.gif"><hr></p>
<p><strong>nviz</strong> is a GRASS module-in-progress which allows users
to realistically render multiple surfaces in a 3D space, optionally
using thematic coloring, draping GRASS vector files over the surfaces,
and displaying GRASS site files either draped on the surfaces or
as 3D point locations.</p>
<p>We are currently in the process of rewriting the tcl/tk interface to make
it easier for programmers to add functionality, and porting the
graphics from IRIS GL to OpenGL.</p>
<p><strong><a href="nviz_toc.html">Draft Tutorial</a></strong></p>
<p><strong><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/viz97/brown/">Features - Slides from Visualization 97 Conference</a></strong></p>
<hr>
<p>Maintained list of <a href="http://freegis.org/cgi-bin/viewcvs.cgi/~checkout~/grass/src.contrib/gmsl/nviz2.2/bugs_todo">BUGS in NVIZ</a> (we are working on these bugs).</p>
<hr>
<p><strong>Animations</strong>. Since each surface often consists of hundreds of thousands of
polygons, with render times of several seconds to a minute, we represent the surfaces with wire meshes as a rough approximation when a user is</p>
<ul>
<li><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/viz/movies/position.mpg">
positioning the viewpoint (324 K)</a>,</li>
<li><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/viz/movies/mvsurf.mpg">
positioning the surfaces (152 K)</a> for a better view of data, or </li>
<li><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/viz/movies/cpwire.mpg">
moving a cutting plane (220 K)</a>
through the surfaces.</li>
<li>By using scripts or keyframe animation,
<a href="http://skagit.meas.ncsu.edu/~helena/gmslab/viz/movies/hor_slice.mpg">fully rendered animations (125 K)</a> are generated.</li>
</ul>
<hr>
<p><strong>Snapshots</strong>. These thumbnail images are links to full size screen dumps
showing some of the multiple surface features of nviz.</p>
<a href="img/nv/cplane.gif"> <img src="img/nv/cplane_i.gif"></a>
<a href="img/nv/inter1.gif"> <img src="img/nv/inter1_i.gif"></a>
<a href="img/nv/lmodel.gif"> <img src="img/nv/lmodel_i.gif"></a>
<a href="img/nv/cut1.gif"> <img src="img/nv/cut1_i.gif"></a>
<a href="img/nv/9j.gif"> <img src="img/nv/9j_i.gif"></a>
<a href="img/nv/mask1.gif"> <img src="img/nv/mask1_i.gif"></a>
<a href="img/nv/sit0.gif"> <img src="img/nv/sit0_i.gif"></a>
<br>
<a href="img/nv/trcut0.gif"> <img src="img/nv/trcut0_i.gif"></a>
<a href="img/nv/trcut1.gif"> <img src="img/nv/trcut1_i.gif"></a>
<a href="img/nv/trcut3.gif"> <img src="img/nv/trcut3_i.gif"></a>
<br>
<a href="img/nv/sit3a.gif"> <img src="img/nv/sit3a_i.gif"></a>
<a href="img/nv/surf3a.gif"> <img src="img/nv/surf3a_i.gif"></a>
<a href="img/nv/transp2.gif"> <img src="img/nv/transp2_i.gif" align=top></a>
<hr>
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