double d9 = yOffset + (double)j4 * yScale + this.yCoord;
                        int k4 = (int)d9;

                        if (d9 < (double)k4)
                        {
                            --k4;
                        }

                        int l4 = k4 & 255;
                        d9 = d9 - (double)k4;
                        double d10 = d9 * d9 * d9 * (d9 * (d9 * 6.0D - 15.0D) + 10.0D);

                        if (j4 == 0 || l4 != k)
                        {
                            k = l4;
                            l = this.permutations[j3] + l4;
                            i1 = this.permutations[l] + i4;
                            j1 = this.permutations[l + 1] + i4;
                            k1 = this.permutations[j3 + 1] + l4;
                            l1 = this.permutations[k1] + i4;
                            i2 = this.permutations[k1 + 1] + i4;
                            d1 = this.lerp(d6, this.grad(this.permutations[i1], d5, d9, d7), this.grad(this.permutations[l1], d5 - 1.0D, d9, d7));
                            d2 = this.lerp(d6, this.grad(this.permutations[j1], d5, d9 - 1.0D, d7), this.grad(this.permutations[i2], d5 - 1.0D, d9 - 1.0D, d7));
                            d3 = this.lerp(d6, this.grad(this.permutations[i1 + 1], d5, d9, d7 - 1.0D), this.grad(this.permutations[l1 + 1], d5 - 1.0D, d9, d7 - 1.0D));
                            d4 = this.lerp(d6, this.grad(this.permutations[j1 + 1], d5, d9 - 1.0D, d7 - 1.0D), this.grad(this.permutations[i2 + 1], d5 - 1.0D, d9 - 1.0D, d7 - 1.0D));
                        }

                        double d11 = this.lerp(d10, d1, d2);
                        double d12 = this.lerp(d10, d3, d4);
                        double d13 = this.lerp(d8, d11, d12);
                        int j7 = i++;
                        noiseArray[j7] += d13 * d0;