threejs创建的三维曲线如何控制其缓慢增长

Question

问题描述

CatmullRomCurve3 生成的曲线会整条显示，怎么让其慢慢变长

相关代码

          var curve = new THREE.CatmullRomCurve3( [
            new THREE.Vector3( 0, 0, 0 ),
            new THREE.Vector3( 1, -1, -1 ),
            new THREE.Vector3( -5, 5, 5 )
          ] );

          var geometry = new THREE.Geometry();
          geometry.vertices = curve.getPoints( 50 );
          console.log(curve);
          var material = new THREE.LineBasicMaterial( { color : 0xff0000 } );
          addMesh = new THREE.Line(geometry, material);
          scene.add(addMesh);
          

Answer 1

创建虚线，初始状态控制实线部分为0，虚线部分为足够长，然后在每一帧中通过控制虚线的虚实长度分配实现生长动画