NoiseSphere.cs

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using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes
{
    public class NoiseSphere : ITerrainPaintableEffect
    {
        #region ITerrainPaintableEffect Members

        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz,
            double strength, double duration, int startX, int endX, int startY, int endY)
        {
            strength = TerrainUtil.MetersToSphericalStrength(strength);

            int x, y;

            for (x = startX; x <= endX; x++)
            {
                for (y = startY; y <= endY; y++)
                {
                    if (!mask[x, y])
                        continue;

                    // Calculate a sphere and add it to the heighmap
                    double z = strength;
                    z *= z;
                    z -= ((x - rx) * (x - rx)) + ((y - ry) * (y - ry));

                    double noise = TerrainUtil.PerlinNoise2D(x / (double) map.Width, y / (double) map.Height, 8, 1.0);

                    if (z > 0.0)
                        map[x, y] += noise * z * duration;
                }
            }
        }

        #endregion
    }
}