示例#1
0
        /// <summary>
        /// This is exposed so it can be called externally on a separate thread, then call this asteroid's constructor
        /// in the main thread once this returns
        /// </summary>
        public static ITriangleIndexed[] GetHullTriangles(double radius)
        {
            const int NUMPOINTS = 60;           // too many, and it looks too perfect

            Exception lastException = null;
            Random    rand          = StaticRandom.GetRandomForThread();

            for (int infiniteLoopCntr = 0; infiniteLoopCntr < 50; infiniteLoopCntr++)           // there is a slight chance that the convex hull generator will choke on the inputs.  If so just retry
            {
                try
                {
                    double minRadius = radius * .9d;

                    Point3D[] points = new Point3D[NUMPOINTS];

                    // Make a point cloud
                    for (int cntr = 0; cntr < NUMPOINTS; cntr++)
                    {
                        points[cntr] = Math3D.GetRandomVector_Spherical(minRadius, radius).ToPoint();
                    }

                    // Squash it
                    Transform3DGroup transform = new Transform3DGroup();
                    transform.Children.Add(new ScaleTransform3D(.33d + (rand.NextDouble() * .66d), .33d + (rand.NextDouble() * .66d), 1d)); // squash it
                    transform.Children.Add(new RotateTransform3D(new QuaternionRotation3D(Math3D.GetRandomRotation())));                    // giving it a random rotation, since it's always squashed along the same axiis
                    transform.Transform(points);

                    // Get a hull that wraps those points
                    ITriangleIndexed[] retVal = Math3D.GetConvexHull(points.ToArray());

                    // Get rid of unused points
                    retVal = TriangleIndexed.Clone_CondensePoints(retVal);

                    // Exit Function
                    return(retVal);
                }
                catch (Exception ex)
                {
                    lastException = ex;
                }
            }

            throw new ApplicationException(lastException.ToString());
        }