three.js Cube Geometry - how to update parameters?

Question

Possibly dumb question but here goes. Three.js geometries have 'parameter' feilds associated with them, see the box geometry here...

box Geometry parameters

I am trying to update these parameters like this...

var nodeSize = 10;
var geometry = new THREE.CubeGeometry(nodeSize, nodeSize, nodeSize);
mesh = new THREE.Mesh(geometry, new THREE.MeshNormalMaterial({side:THREE.DoubleSide}));

scene.add(mesh);
mesh.geometry.parameters.depth=20;

But of course, the geometry remains unchanged. Is there a way of updating the geometry by editing these parameters?

fiddle here https://jsfiddle.net/kn3owveg/2/

Any help appreciated!

Answer 1

parameters.depth is only used at geometry construction time. it has no effect when modifying it. you can think of it as read only .

Use the example at BoxGeometry and the gui on the right to see how to achieve what you want.

Answer 2

Gaitat is totally right, you can't change geometry with changing of parameters .

And there can be another solution. With scaling of your cube.

function setSize( myMesh, xSize, ySize, zSize){
  scaleFactorX = xSize / myMesh.geometry.parameters.width;
  scaleFactorY = ySize / myMesh.geometry.parameters.height;
  scaleFactorZ = zSize / myMesh.geometry.parameters.depth;
  myMesh.scale.set( scaleFactorX, scaleFactorY, scaleFactorZ );
}
...
setSize(mesh, 10, 10, 20);

jsfiddle example

Answer 3

更改参数后，需要再次render 。