Merging Geometry

import * as PIXI from 'pixi.js';

const app = new PIXI.Application({ resizeTo: window });

document.body.appendChild(app.view);

const geometry = new PIXI.Geometry()
    .addAttribute('aVertexPosition', // the attribute name
        [-100, -100, // x, y
            100, -100, // x, y
            100, 100,
            -100, 100], // x, y
        2) // the size of the attribute
    .addAttribute('aUvs', // the attribute name
        [0, 0, // u, v
            1, 0, // u, v
            1, 1,
            0, 1], // u, v
        2) // the size of the attribute
    .addIndex([0, 1, 2, 0, 2, 3]);

const geometry2 = new PIXI.Geometry()
    .addAttribute('aVertexPosition', // the attribute name
        [-100 + 100, -100, // x, y
            100 + 100, -100, // x, y
            100 + 100, 100], // x, y
        2) // the size of the attribute
    .addAttribute('aUvs', // the attribute name
        [0, 0, // u, v
            1, 0, // u, v
            1, 1], // u, v
        2) // the size of the attribute
    .addIndex([0, 1, 2]);

const geometry3 = PIXI.Geometry.merge([geometry, geometry2]);

const shader = PIXI.Shader.from(`

    precision mediump float;

    attribute vec2 aVertexPosition;
    attribute vec2 aUvs;

    uniform mat3 translationMatrix;
    uniform mat3 projectionMatrix;

    varying vec2 vUvs;

    void main() {

        vUvs = aUvs;
        gl_Position = vec4((projectionMatrix * translationMatrix * vec3(aVertexPosition, 1.0)).xy, 0.0, 1.0);

    }`,

`precision mediump float;

    varying vec2 vUvs;

    uniform sampler2D uSampler2;

    void main() {

        gl_FragColor = texture2D(uSampler2, vUvs );
    }

`,
{
    uSampler2: PIXI.Texture.from('https://pixijs.com/assets/bg_scene_rotate.jpg'),
});

const quad = new PIXI.Mesh(geometry3, shader);

quad.position.set(400, 300);
quad.scale.set(2);

app.stage.addChild(quad);

app.ticker.add((delta) =>
{
    quad.rotation += 0.01;
});