如何更改threejs中的圓錐體轉軸？

Question

我需要調整由THREE.CylinderGeometry創建的錐體。 我需要使它更長，並且朝向負Z軸方向發展，而我發現方向既是負面的，也是正面的。

我的確知道原因是圓錐體的縮放樞軸放在裏面，所以任何人都可以告訴我如何在三個j中改變網格的縮放樞軸？

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);