fix bug

src/camera.ts

@@ -76,7 +76,7 @@ export class Camera {
     }
     get right(): vec3 {
         const ret = vec3.create();
-        vec3.cross(ret, this.up, this.forward)
-        return vec3.cross(vec3.create(),this.forward,[0,1,0]);;
+        vec3.cross(ret, this.forward, this.up);
+        return ret;
     }
 };