How do you want to manipulate it?

I would like to change textures, opacity, rotation etc.

For example - cube.rotation.x+= 90;.

This works fine when “cube” is created in Three.js

var cube = new THREE.Mesh( geometry, material );
            scene.add( cube );

When I import cube from Blender, “cube.rotation.x+= 90” gives “cube is not defined”.

loader.load('jsonText.json',function ( object ){
                scene.add( object );
                cube.rotation.x = 90;
            }
        );

Json file is below.

{
    "metadata": {
        "version": 4.5,
        "type": "Object",
        "generator": "Object3D.toJSON"
    },
    "geometries": [
        {
            "uuid": "F587CA59-4813-4AC0-A16A-EE68CE473554",
            "type": "BufferGeometry",
            "data": {
                "attributes": {
                    "position": {
                        "itemSize": 3,
                        "type": "Float32Array",
                        "array": [-0.5,0.5,1,-0.5,1.5,1,-0.5,1.5,-1,-0.5,0.5,1,-0.5,1.5,-1,-0.5,0.5,-1,-0.5,0.5,-1,-0.5,1.5,-1,0.5,1.5,-1,-0.5,0.5,-1,0.5,1.5,-1,0.5,0.5,-1,0.5,0.5,1,0.5,1.5,1,-0.5,1.5,1,0.5,0.5,1,-0.5,1.5,1,-0.5,0.5,1,-0.5,0.5,-1,0.5,0.5,-1,0.5,0.5,1,-0.5,0.5,-1,0.5,0.5,1,-0.5,0.5,1,0.5,1.5,-1,-0.5,1.5,-1,-0.5,1.5,1,0.5,1.5,-1,-0.5,1.5,1,0.5,1.5,1],
                        "normalized": false
                    },
                    "normal": {
                        "itemSize": 3,
                        "type": "Float32Array",
                        "array": [-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0],
                        "normalized": false
                    }
                },
                "boundingSphere": {
                    "center": [0,1,0],
                    "radius": 1.224745
                }
            }
        }],
    "materials": [
        {
            "uuid": "FBE8471B-9A87-46EF-B188-935A705E815D",
            "type": "MeshPhongMaterial",
            "name": "None",
            "color": 16777215,
            "emissive": 0,
            "specular": 1118481,
            "shininess": 30,
            "flatShading": true,
            "depthFunc": 3,
            "depthTest": true,
            "depthWrite": true
        }],
    "object": {
        "uuid": "D14B9B4B-4487-449C-8876-6669DDDE8D68",
        "type": "Scene",
        "name": "Scene",
        "layers": 1,
        "matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
        "children": [
            {
                "uuid": "92CBA877-46B1-48E5-8082-E933258FDE2F",
                "type": "Group",
                "name": "microwave.obj",
                "layers": 1,
                "matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
                "children": [
                    {
                        "uuid": "6D0B45BA-FF78-4795-A4DF-F213D1E40EFE",
                        "type": "Mesh",
                        "name": "cube",
                        "layers": 1,
                        "matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
                        "geometry": "F587CA59-4813-4AC0-A16A-EE68CE473554",
                        "material": "FBE8471B-9A87-46EF-B188-935A705E815D"
                    }]
            }],
        "background": 11184810
    }
}

So it works?

No it doesn’t work, it returns cube as undefined.

Can you show me the error