Axiom.SceneManagers.Octree.TerrainRenderable.CalculateMinLevelDist2 C# (CSharp) Method

		public void CalculateMinLevelDist2( float C )
		{
			// level 1 has no delta
			minLevelDistSqr[ 0 ] = 0;

			for ( int level = 1; level < numMipMaps; level++ )
			{
				minLevelDistSqr[ level ] = 0;

				int step = 1 << level;

				for ( int j = 0; j < size - step; j += step )
				{
					for ( int i = 0; i < size - step; i += step )
					{
						//check each height inbetween the steps.
						float h1 = GetVertex( i, j, 1 );
						float h2 = GetVertex( i + step, j, 1 );
						float h3 = GetVertex( i + step, j + step, 1 );
						float h4 = GetVertex( i, j + step, 1 );

						for ( int z = 1; z < step; z++ )
						{
							for ( int x = 1; x < step; x++ )
							{
								float zpct = z / step;
								float xpct = x / step;

								//interpolated height
								float top = h3 * ( 1.0f - xpct ) + xpct * h4;
								float bottom = h1 * ( 1.0f - xpct ) + xpct * h2;

								float interp_h = top * ( 1.0f - zpct ) + zpct * bottom;

								float actual_h = GetVertex( i + x, j + z, 1 );
								float delta = Utility.Abs( interp_h - actual_h );

								float D2 = delta * delta * C * C;

								if ( minLevelDistSqr[ level ] < D2 )
									minLevelDistSqr[ level ] = D2;
							}
						}
					}
				}
			}

			//make sure the levels are increasing...
			for ( int i = 1; i < numMipMaps; i++ )
			{
				if ( minLevelDistSqr[ i ] < minLevelDistSqr[ i - 1 ] )
					minLevelDistSqr[ i ] = minLevelDistSqr[ i - 1 ] + 1;
			}
		}