title: Google earth not showing correct polygon orientation
body: <p>I created a sample kml, in which there are two polygons with same orientation. But in google earth, one is darker than the other one, it shows wrong orientation.</p>
  
  <p>Here is a sample kml file.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom"&gt;
  &lt;Document&gt;
  &lt;name&gt;KmlFile&lt;/name&gt;
  &lt;Placemark&gt;
  &lt;name&gt;Shell Polygons&lt;/name&gt;
  &lt;MultiGeometry&gt;
  &lt;Polygon&gt;
  &lt;altitudeMode&gt;relativeToGround&lt;/altitudeMode&gt;
  &lt;outerBoundaryIs&gt;
  &lt;LinearRing&gt;
  &lt;coordinates&gt;
  -1.46794286722133,53.38399869052405,0.9 -1.46794286722724,53.38399869050928,6.720900000000001 -1.46802203110511,53.38399869049681,3 -1.46794286722133,53.38399869052405,0.9
  &lt;/coordinates&gt;
  &lt;/LinearRing&gt;
  &lt;/outerBoundaryIs&gt;
  &lt;/Polygon&gt;
  &lt;Polygon&gt;
  &lt;altitudeMode&gt;relativeToGround&lt;/altitudeMode&gt;
  &lt;outerBoundaryIs&gt;
  &lt;LinearRing&gt;
  &lt;coordinates&gt;
  -1.46802203110511,53.38399869049681,3 -1.46794286722724,53.38399869050928,6.720900000000001 -1.46802203106645,53.38399869048823,6.392399999999999 -1.46802203110511,53.38399869049681,3
  &lt;/coordinates&gt;
  &lt;/LinearRing&gt;
  &lt;/outerBoundaryIs&gt;
  &lt;/Polygon&gt;
  &lt;/MultiGeometry&gt;
  &lt;/Placemark&gt;
  &lt;/Document&gt;
  &lt;/kml&gt;
  </code></pre>
  
  <p>According to the coordinates, we can get the normal of them (by cross product), 1.27245E-10,-0.000460805,-1.17167E-15 and 7.40792E-11,-0.000268555,-6.81175E-16 , then dot product them, get 1.23752E-07 > 0. But the kml was rendered as one is darker than the other one.</p>
  
  <p>Is there something wrong with my kml file? or is this really an issue of google earth?</p>
  
  <p>Any reply will be appreciated.</p>