Disabled external gits

Alpano/tests/ch/epfl/alpano/dem/WavyDEM.java

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+package ch.epfl.alpano.dem;
+
+import ch.epfl.alpano.Interval2D;
+import static java.lang.Math.PI;
+import static java.lang.Math.sin;
+import static java.lang.Math.cos;
+
+final class WavyDEM implements DiscreteElevationModel {
+  private final static double PERIOD = 100, HEIGHT = 1000;
+  private final Interval2D extent;
+
+  public WavyDEM(Interval2D extent) {
+    this.extent = extent;
+  }
+
+@Override
+  public void close() throws Exception { }
+
+  @Override
+  public Interval2D extent() { return extent; }
+
+  @Override
+  public double elevationSample(int x, int y) {
+    double x1 = PI * 2d * x / PERIOD;
+    double y1 = PI * 2d * y / PERIOD;
+    return (1 + sin(x1) * cos(y1)) / 2d * HEIGHT;
+  }
+}