const button1 = document.getElementById('btn1');
        const button2 = document.getElementById('btn2');

        Hydreigon.ModelViewer.create(document.body, {
            "autoStart": true,
            "scenes": [{
                "url": "https://hydreigon-publish.cdn.bcebos.com/sdk-index/assets/model/RobotExpressive.glb",
                "offset": [0, -10, 0]
            }]
        }).then(app => {
            app.addEventListener('mount', () => {
                const leftHand = Hydreigon.ModelViewer.findChildByName(app.model.scene, 'Hand.L_0');
                const rightHand = Hydreigon.ModelViewer.findChildByName(app.model.scene, 'Hand.R_0');
                const id1 = Symbol();
                const id2 = Symbol();
                button1.onclick = () => {
                    let time = 0;
                    app.logicLoop.remove(id1);
                    app.logicLoop.add(() => {
                        time += Math.PI / 1000 * 50 / 3;
                        Hydreigon.ModelViewer.emissiveMesh(leftHand, time, [1, 1, 0]);
                        if (time >= Math.PI * 3) {
                            app.logicLoop.remove(id1);
                        }
                    }, id1);
                };
                button2.onclick = () => {
                    let time = 0;
                    app.logicLoop.remove(id2);
                    app.logicLoop.add(() => {
                        time += Math.PI / 1000 * 50 / 3;
                        Hydreigon.ModelViewer.emissiveMesh(rightHand, time,  [0, 1, 1]);
                        if (time >= Math.PI * 3) {
                            app.logicLoop.remove(id2);
                        }
                    }, id2);
                };
            });
        });