first commit

public/sdk/three/jsm/helpers/PositionalAudioHelper.js

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+import {
+	BufferGeometry,
+	BufferAttribute,
+	LineBasicMaterial,
+	Line,
+	MathUtils
+} from 'three';
+
+class PositionalAudioHelper extends Line {
+
+	constructor( audio, range = 1, divisionsInnerAngle = 16, divisionsOuterAngle = 2 ) {
+
+		const geometry = new BufferGeometry();
+		const divisions = divisionsInnerAngle + divisionsOuterAngle * 2;
+		const positions = new Float32Array( ( divisions * 3 + 3 ) * 3 );
+		geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );
+
+		const materialInnerAngle = new LineBasicMaterial( { color: 0x00ff00 } );
+		const materialOuterAngle = new LineBasicMaterial( { color: 0xffff00 } );
+
+		super( geometry, [ materialOuterAngle, materialInnerAngle ] );
+
+		this.audio = audio;
+		this.range = range;
+		this.divisionsInnerAngle = divisionsInnerAngle;
+		this.divisionsOuterAngle = divisionsOuterAngle;
+		this.type = 'PositionalAudioHelper';
+
+		this.update();
+
+	}
+
+	update() {
+
+		const audio = this.audio;
+		const range = this.range;
+		const divisionsInnerAngle = this.divisionsInnerAngle;
+		const divisionsOuterAngle = this.divisionsOuterAngle;
+
+		const coneInnerAngle = MathUtils.degToRad( audio.panner.coneInnerAngle );
+		const coneOuterAngle = MathUtils.degToRad( audio.panner.coneOuterAngle );
+
+		const halfConeInnerAngle = coneInnerAngle / 2;
+		const halfConeOuterAngle = coneOuterAngle / 2;
+
+		let start = 0;
+		let count = 0;
+		let i;
+		let stride;
+
+		const geometry = this.geometry;
+		const positionAttribute = geometry.attributes.position;
+
+		geometry.clearGroups();
+
+		//
+
+		function generateSegment( from, to, divisions, materialIndex ) {
+
+			const step = ( to - from ) / divisions;
+
+			positionAttribute.setXYZ( start, 0, 0, 0 );
+			count ++;
+
+			for ( i = from; i < to; i += step ) {
+
+				stride = start + count;
+
+				positionAttribute.setXYZ( stride, Math.sin( i ) * range, 0, Math.cos( i ) * range );
+				positionAttribute.setXYZ( stride + 1, Math.sin( Math.min( i + step, to ) ) * range, 0, Math.cos( Math.min( i + step, to ) ) * range );
+				positionAttribute.setXYZ( stride + 2, 0, 0, 0 );
+
+				count += 3;
+
+			}
+
+			geometry.addGroup( start, count, materialIndex );
+
+			start += count;
+			count = 0;
+
+		}
+
+		//
+
+		generateSegment( - halfConeOuterAngle, - halfConeInnerAngle, divisionsOuterAngle, 0 );
+		generateSegment( - halfConeInnerAngle, halfConeInnerAngle, divisionsInnerAngle, 1 );
+		generateSegment( halfConeInnerAngle, halfConeOuterAngle, divisionsOuterAngle, 0 );
+
+		//
+
+		positionAttribute.needsUpdate = true;
+
+		if ( coneInnerAngle === coneOuterAngle ) this.material[ 0 ].visible = false;
+
+	}
+
+	dispose() {
+
+		this.geometry.dispose();
+		this.material[ 0 ].dispose();
+		this.material[ 1 ].dispose();
+
+	}
+
+}
+
+
+export { PositionalAudioHelper };