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