example improved

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@35609 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.nviz/d.nviz.html

@@ -86,12 +86,14 @@ To interactively create an NVIZ animation from raster elev.rast with
 the scene, run the following:
 
 <div class="code"><pre>
+g.region rast=elevation.dem
+d.rast elevation.dem
 d.nviz -ik input=elevation.dem output=nviz.script dist=2400 ht=1220 frames=1000
 </pre></div>
 In the above the example the user is prompted to select the route from the GRASS monitor.
-The output script, nviz.script, can then be run in NVIZ:
+The output script, 'nviz.script.nvscr', can then be run in NVIZ:
 <div class="code"><pre>
-nviz el=elevation.dem script=nviz.script
+nviz elevation=elevation.dem script=nviz.script.nvscr
 </pre></div>
 
 <H2>NOTES / HINTS</H2>
@@ -121,7 +123,7 @@ user can run nviz with a previuosly saved state and the
 <em>d.nviz</em> generated script:
 
 <div class="code"><pre>
-nviz state=saved.state script=nviz.script
+nviz state=saved.state script=nviz.script.nvscr
 </pre></div>
 
 <h3>Keyframe animator script</h3>