1 import * as THREE from 'three'; 2 3 export function generateTunnelGeometry( 4 tunnelHeight = 20, tunnelWidth = 14, 5 tunnelWallThickness = 0.5, tunnelLen = 26) { 6 7 const path = new THREE.Path(); 8 path.moveTo(-tunnelWidth/2, 0); 9 path.lineTo(-tunnelWidth/2, tunnelHeight*1/3); 10 path.moveTo(-tunnelWidth/2, tunnelHeight*1/3); 11 path.quadraticCurveTo(0, tunnelHeight, tunnelWidth/2, tunnelHeight*1/3); 12 path.moveTo(tunnelWidth/2, 0); 13 path.lineTo(tunnelWidth/2, 0); 14 15 16 // cerramos la curva con otra de la misma forma con una diferencia de 17 // `tunnelWallThickness` 18 path.lineTo(tunnelWidth/2-tunnelWallThickness, 0); 19 path.moveTo(tunnelWidth/2-tunnelWallThickness, 0); 20 21 path.lineTo(tunnelWidth/2-tunnelWallThickness, tunnelHeight*1/3); 22 path.moveTo(tunnelWidth/2-tunnelWallThickness, tunnelHeight*1/3); 23 24 path.quadraticCurveTo( 25 0, tunnelHeight-(tunnelWallThickness*2), 26 -tunnelWidth/2+tunnelWallThickness, tunnelHeight*1/3); 27 28 path.lineTo(-tunnelWidth/2+tunnelWallThickness, 0); 29 path.moveTo(-tunnelWidth/2+tunnelWallThickness, 0); 30 31 path.lineTo(-tunnelWidth/2, 0); 32 path.moveTo(-tunnelWidth/2, 0); 33 34 const points = path.getPoints(); 35 const shape = new THREE.Shape(points); 36 37 const extrudeSettings = { 38 curveSegments: 24, 39 steps: 50, 40 depth: tunnelLen, 41 }; 42 43 const geometry = new THREE.ExtrudeGeometry(shape, extrudeSettings); 44 45 // el `1` en `x` es porque por algun motivo queda descentrado con respecto 46 // a la vía del tren 47 geometry.translate(1, 0, -tunnelLen/2); 48 return geometry; 49 }
