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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include "nopositiongeometry.h"
++ #include <QtGui/QVector3D>
++
++ NoPositionGeometry::NoPositionGeometry()
++ {
++ QByteArray vertexData(3 * sizeof(QVector3D), Qt::Initialization::Uninitialized);
++ setVertexData(vertexData);
++ setStride(sizeof(QVector3D));
++ setBounds(QVector3D(-1.0f, -1.0f, -1.0f), QVector3D(1.0f, 1.0f, 1.0f));
++ setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
++
++ // Deliberately do not call addAttribute(PositionSemantic, ...) here: this
++ // is what used to hit a reachable Q_UNREACHABLE() in
++ // QQuick3DPhysicsMesh's attributeBySemantic() helper.
++ }