如何更改threejs中的圆锥体转轴？

Question

我需要调整由THREE.CylinderGeometry创建的锥体。 我需要使它更长，并且朝向负Z轴方向发展，而我发现方向既是负面的，也是正面的。

我的确知道原因是圆锥体的缩放枢轴放在里面，所以任何人都可以告诉我如何在三个j中改变网格的缩放枢轴？

Answer 1

//CYLINDER 
var cyl_material = new THREE.MeshBasicMaterial({ color: 0xff0000 }); 
var cyl_width = 1; 
var cyl_height = 5; 
// THREE.CylinderGeometry(bottomRadius, topRadius, height, segmentsRadius, 
segmentsHeight, openEnded) 
var cylGeometry = new THREE.CylinderGeometry(cyl_width, cyl_width, cyl_height, 20, 1, false); 
// translate the cylinder geometry so that the desired point within the 
geometry is now at the origin 
cylGeometry.applyMatrix(new THREE.Matrix4().makeTranslation(0, cyl_height/2, 0)); 
var cylinder = new THREE.Mesh(cylGeometry, cyl_material); 

scene.add(cylinder);