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+/****************************************************************************
+**
+** Copyright (C) 2014 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+vec3 flakeNoiseBumpTexture( in texture_coordinate_info uvw, in float scale, in float strength, in vec3 normal )
+{
+ vec3 tex = uvw.position / scale;
+ vec3 grad = miNoise( tex ).xyz;
+
+ // displace coordinate according to noise value
+ tex += 2.0 * grad;
+
+ // then use only integer coordinates, to make flakes transients harder and not wobbly
+ grad = miNoise( round( tex ) ).xyz;
+
+ vec3 n = normalize(vec3(strength * grad.x, strength * grad.y, 1.0));
+ n = n.x*uvw.tangent_u + n.y*uvw.tangent_v + n.z*normal;
+ return normalize(normal + n);
+}
+