Added a new background without a seam.

graph.js

@@ -33,7 +33,7 @@ function add_background() {
     //const planeGeometry = new THREE.PlaneGeometry(1000, 1000, 1, 1);
     const loader = new THREE.TextureLoader();
     //const planeMaterial = new THREE.MeshLambertMaterial({color: 0xFF0000, side: THREE.DoubleSide}); //THREE.BackSide
-    const planeMaterial = new THREE.MeshBasicMaterial({map: loader.load(plugin_path + 'background.jpg'), side: THREE.DoubleSide}); //THREE.BackSide
+    const planeMaterial = new THREE.MeshBasicMaterial({map: loader.load(plugin_path + 'background_2.jpg'), side: THREE.DoubleSide}); //THREE.BackSide
     const mesh = new THREE.Mesh(sphereGeometry, planeMaterial);
     mesh.position.set(0, 0, 0);
     //mesh.rotation.set(0.5 * Math.PI, 0, 0);