<!-- AVATAR-FORGE · part 107 -->
is ) {

			blurUniforms[ 'poleAxis' ].value = poleAxis;

		}

		const { _lodMax } = this;
		blurUniforms[ 'dTheta' ].value = radiansPerPixel;
		blurUniforms[ 'mipInt' ].value = _lodMax - lodIn;

		const outputSize = this._sizeLods[ lodOut ];
		const x = 3 * outputSize * ( lodOut > _lodMax - LOD_MIN ? lodOut - _lodMax + LOD_MIN : 0 );
		const y = 4 * ( this._cubeSize - outputSize );

		_setViewport( targetOut, x, y, 3 * outputSize, 2 * outputSize );
		renderer.setRenderTarget( targetOut );
		renderer.render( blurMesh, _flatCamera );

	}

}


function _createPlanes( lodMax ) {

	const lodPlanes = [];
	const sizeLods = [];
	const sigmas = [];

	let lod = lodMax;

	const totalLods = lodMax - LOD_MIN + 1 + EXTRA_LOD_SIGMA.length;

	for ( let i = 0; i < totalLods; i ++ ) {

		const sizeLod = Math.pow( 2, lod );
		sizeLods.push( sizeLod );
		let sigma = 1.0 / sizeLod;

		if ( i > lodMax - LOD_MIN ) {

			sigma = EXTRA_LOD_SIGMA[ i - lodMax + LOD_MIN - 1 ];

		} else if ( i === 0 ) {

			sigma = 0;

		}

		sigmas.push( sigma );

		const texelSize = 1.0 / ( sizeLod - 2 );
		const min = - texelSize;
		const max = 1 + texelSize;
		const uv1 = [ min, min, max, min, max, max, min, min, max, max, min, max ];

		const cubeFaces = 6;
		const vertices = 6;
		const positionSize = 3;
		const uvSize = 2;
		const faceIndexSize = 1;

		const position = new Float32Array( positionSize * vertices * cubeFaces );
		const uv = new Float32Array( uvSize * vertices * cubeFaces );
		const faceIndex = new Float32Array( faceIndexSize * vertices * cubeFaces );

		for ( let face = 0; face < cubeFaces; face ++ ) {

			const x = ( face % 3 ) * 2 / 3 - 1;
			const y = face > 2 ? 0 : - 1;
			const coordinates = [
				x, y, 0,
				x + 2 / 3, y, 0,
				x + 2 / 3, y + 1, 0,
				x, y, 0,
				x + 2 / 3, y + 1, 0,
				x, y + 1, 0
			];
			position.set( coordinates, positionSize * vertices * face );
			uv.set( uv1, uvSize * vertices * face );
			const fill = [ face, face, face, face, face, face ];
			faceIndex.set( fill, faceIndexSize * vertices * face );

		}

		const planes = new BufferGeometry();
		planes.setAttribute( 'position', new BufferAttribute( position, positionSize ) );
		planes.setAttribute( 'uv', new BufferAttribute( uv, uvSize ) );
		planes.setAttribute( 'faceIndex', new BufferAttribute( faceIndex, faceIndexSize ) );
		lodPlanes.push( planes );

		if ( lod > LOD_MIN ) {

			lod --;

		}

	}

	return { lodPlanes, sizeLods, sigmas };

}

function _createRenderTarget( width, height, params ) {

	const cubeUVRenderTarget = new WebGLRenderTarget( width, height, params );
	cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;
	cubeUVRenderTarget.texture.name = 'PMREM.cubeUv';
	cubeUVRenderTarget.scissorTest = true;
	return cubeUVRenderTarget;

}

function _setViewport( target, x, y, width, height ) {

	target.viewport.set( x, y, width, height );
	target.scissor.set( x, y, width, height );

}

function _getBlurShader( lodMax, width, height ) {

	const weights = new Float32Array( MAX_SAMPLES );
	const poleAxis = new Vector3( 0, 1, 0 );
	const shaderMaterial = new ShaderMaterial( {

		name: 'SphericalGaussianBlur',

		defines: {
			'n': MAX_SAMPLES,
			'CUBEUV_TEXEL_WIDTH': 1.0 / width,
			'CUBEUV_TEXEL_HEIGHT': 1.0 / height,
			'CUBEUV_MAX_MIP': `${lodMax}.0`,
		},

		uniforms: {
			'envMap': { value: null },
			'samples': { value: 1 },
			'weights': { value: weights },
			'latitudinal': { value: false },
			'dTheta': { value: 0 },
			'mipInt': { value: 0 },
			'poleAxis': { value: poleAxis }
		},

		vertexShader: _getCommonVertexShader(),

		fragmentShader: /* glsl */`

			precision mediump float;
			precision mediump int;

			varying vec3 vOutputDirection;

			uniform sampler2D envMap;
			uniform int samples;
			uniform float weights[ n ];
			uniform bool latitudinal;
			uniform float dTheta;
			uniform float mipInt;
			uniform vec3 poleAxis;

			#define ENVMAP_TYPE_CUBE_UV
			#include <cube_uv_reflection_fragment>

			vec3 getSample( float theta, vec3 axis ) {

				float cosTheta = cos( theta );
				// Rodrigues' axis-angle rotation
				vec3 sampleDirection = vOutputDirection * cosTheta
					+ cross( axis, vOutputDirection ) * sin( theta )
					+ axis * dot( axis, vOutputDirection ) * ( 1.0 - cosTheta );

				return bilinearCubeUV( envMap, sampleDirection, mipInt );

			}

			void main() {

				vec3 axis = latitudinal ? poleAxis : cross( poleAxis, vOutputDirection );

				if ( all( equal( axis, vec3( 0.0 ) ) ) ) {

					axis = vec3( vOutputDirection.z, 0.0, - vOutputDirection.x );

				}

				axis = normalize( axis );

				gl_FragColor = vec4( 0.0, 0.0, 0.0, 1.0 );
				gl_FragColor.rgb += weights[ 0 ] * getSample( 0.0, axis );

				for ( int i = 1; i < n; i++ ) {

					if ( i >= samples ) {

						break;

					}

					float theta = dTheta * float( i );
					gl_FragColor.rgb += weights[ i ] * getSample( -1.0 * theta, axis );
					gl_FragColor.rgb += weights[ i ] * getSample( theta, axis );

				}