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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ float getHeight(vec2 pos) {
++ return textureLod(heightMap, pos, 0).r;
++ }
++
++ void MAIN()
++ {
++ const float offset = 0.004;
++
++ VERTEX.y += getHeight(UV0);
++ TANGENT = normalize(vec3(0.0, getHeight(UV0 + vec2(0.0, offset)) - getHeight(UV0 + vec2(0.0, -offset)), offset * 2.0));
++ BINORMAL = normalize(vec3(offset * 2.0, getHeight(UV0 + vec2(offset, 0.0)) - getHeight(UV0 + vec2(-offset, 0.0)), 0.0));
++ NORMAL = cross(TANGENT, BINORMAL);
++ }