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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #ifndef BADSTRIDEGEOMETRY_H
++ #define BADSTRIDEGEOMETRY_H
++
++ #include <QtQuick3D/QQuick3DGeometry>
++
++ // A deliberately malformed geometry: its PositionSemantic attribute is declared
++ // at an offset that doesn't fit within the vertex stride, so reading a position
++ // out of every stride-sized record would walk past the end of the buffer.
++ class BadStrideGeometry : public QQuick3DGeometry
++ {
++ Q_OBJECT
++ QML_NAMED_ELEMENT(BadStrideGeometry)
++
++ public:
++ BadStrideGeometry();
++ };
++
++ #endif