Qt Quick 3D - Custom Instanced Rendering

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

 VARYING vec4 vCustomData;
 VARYING vec3 vGlobalPosition;
 void MAIN()
 {
     vCustomData = INSTANCE_DATA;

     // MODEL_MATRIX does not exist when instancing
     vec4 pos = INSTANCE_MODEL_MATRIX * vec4(VERTEX, 1.0);
     vGlobalPosition = pos.xyz;
 }