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 };