      blueNoisePath: 'blue_noise.png'
                });
                this.motionBlurCompositeMaterial.uniforms.tVelocity.value = this.drawBuffers.renderTarget.textures[1];

                // Occlusion material
                this.blackoutMaterial = new MeshBasicMaterial({ color: 0x000000 });

                // Gaussian blur materials
                this.hBlurMaterial = new BlurMaterial(BlurDirectionX);
                this.hBlurMaterial.uniforms.uBlurAmount.value = this.blurAmount;

               