public void testSurfaceTriangle() throws Exception {
Vector3d v1 = new Vector3d(1.0, 0.0, 0.0);
Vector3d v2 = new Vector3d(0.0, 1.0, 0.0);
Vector3d v3 = new Vector3d(0.0, 0.0, 1.0);
PixTools pt = new PixTools();
double res = pt.SurfaceTriangle(v1, v2, v3);
System.out.println("Triangle surface is=" + res / Math.PI
+ " steredians");
assertEquals("Triangle surface=" + res, 0.5, res / Math.PI, 1e-10);
System.out.println(" test of SurfaceTriangle is done");
}