Qt Quick 3D - Custom Effect Example

 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 VARYING vec2 center_vec;

 void MAIN()
 {
     center_vec = INPUT_UV - vec2(0.5, 0.5);
     center_vec.y *= INPUT_SIZE.y / INPUT_SIZE.x;
 }