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@@ -0,0 +1,108 @@
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+/**
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+ * @author Mugen87 / http://github.com/Mugen87
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+ */
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+
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+import { BufferGeometry } from '../core/BufferGeometry.js';
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+import { BufferAttribute } from '../core/BufferAttribute.js';
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+import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
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+import { Line } from '../objects/Line.js';
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+import { _Math } from '../math/Math.js';
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+
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+function PositionalAudioHelper( audio, range, divisionsInnerAngle, divisionsOuterAngle ) {
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+
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+ this.audio = audio;
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+ this.range = range || 1;
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+ this.divisionsInnerAngle = divisionsOuterAngle || 16;
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+ this.divisionsOuterAngle = divisionsOuterAngle || 2;
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+
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+ var geometry = new BufferGeometry();
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+ var divisions = this.divisionsInnerAngle + this.divisionsOuterAngle * 2;
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+ var positions = new Float32Array( ( divisions * 3 + 3 ) * 3 );
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+ geometry.addAttribute( 'position', new BufferAttribute( positions, 3 ) );
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+
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+ var materialInnerAngle = new LineBasicMaterial( { color: 0x00ff00 } );
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+ var materialOuterAngle = new LineBasicMaterial( { color: 0xffff00 } );
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+
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+ Line.call( this, geometry, [ materialOuterAngle, materialInnerAngle ] );
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+
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+ this.update();
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+
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+}
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+
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+PositionalAudioHelper.prototype = Object.create( Line.prototype );
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+PositionalAudioHelper.prototype.constructor = PositionalAudioHelper;
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+
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+PositionalAudioHelper.prototype.update = function () {
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+
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+ var audio = this.audio;
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+ var range = this.range;
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+ var divisionsInnerAngle = this.divisionsInnerAngle;
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+ var divisionsOuterAngle = this.divisionsOuterAngle;
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+
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+ var coneInnerAngle = _Math.degToRad( audio.panner.coneInnerAngle );
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+ var coneOuterAngle = _Math.degToRad( audio.panner.coneOuterAngle );
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+
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+ var halfConeInnerAngle = coneInnerAngle / 2;
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+ var halfConeOuterAngle = coneOuterAngle / 2;
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+
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+ var start = 0;
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+ var count = 0;
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+ var i, stride;
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+
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+ var geometry = this.geometry;
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+ var positionAttribute = geometry.attributes.position;
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+
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+ geometry.clearGroups();
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+
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+ //
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+
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+ function generateSegment( from, to, divisions, materialIndex ) {
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+
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+ var step = ( to - from ) / divisions;
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+
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+ positionAttribute.setXYZ( start, 0, 0, 0 );
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+ count ++;
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+
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+ for ( i = from; i < to; i += step ) {
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+
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+ stride = start + count;
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+
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+ positionAttribute.setXYZ( stride, Math.sin( i ) * range, 0, Math.cos( i ) * range );
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+ positionAttribute.setXYZ( stride + 1, Math.sin( Math.min( i + step, to ) ) * range, 0, Math.cos( Math.min( i + step, to ) ) * range );
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+ positionAttribute.setXYZ( stride + 2, 0, 0, 0 );
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+
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+ count += 3;
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+
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+ }
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+
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+ geometry.addGroup( start, count, materialIndex );
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+
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+ start += count;
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+ count = 0;
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+
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+ }
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+
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+ //
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+
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+ generateSegment( - halfConeOuterAngle, - halfConeInnerAngle, divisionsOuterAngle, 0 );
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+ generateSegment( - halfConeInnerAngle, halfConeInnerAngle, divisionsInnerAngle, 1 );
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+ generateSegment( halfConeInnerAngle, halfConeOuterAngle, divisionsOuterAngle, 0 );
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+
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+ //
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+
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+ positionAttribute.needsUpdate = true;
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+
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+ if ( coneInnerAngle === coneOuterAngle ) this.material[ 0 ].visible = false;
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+
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+};
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+
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+PositionalAudioHelper.prototype.dispose = function () {
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+
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+ this.geometry.dispose();
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+ this.material[ 0 ].dispose();
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+ this.material[ 1 ].dispose();
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+
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+};
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+
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+
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+export { PositionalAudioHelper };
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Mugen87