Qt Quick 3D - Volumetric Rendering Example
// Copyright (C) 2023 The Qt Company Ltd. // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause #include "lineboxgeometry.h" #include <QRandomGenerator> #include <QVector3D> #include <array> LineBoxGeometry::LineBoxGeometry() { constexpr int kStride = sizeof(QVector3D); QByteArray vertexData(24 * kStride, Qt::Initialization::Uninitialized); QVector3D *p = reinterpret_cast<QVector3D *>(vertexData.data()); std::array<QVector3D, 8> pts; pts[0] = QVector3D(-50, -50, -50); pts[1] = QVector3D(-50, -50, +50); pts[2] = QVector3D(-50, +50, +50); pts[3] = QVector3D(-50, +50, -50); pts[4] = QVector3D(+50, -50, -50); pts[5] = QVector3D(+50, -50, +50); pts[6] = QVector3D(+50, +50, +50); pts[7] = QVector3D(+50, +50, -50); // left side *p = pts[0]; p++; *p = pts[1]; p++; *p = pts[1]; p++; *p = pts[2]; p++; *p = pts[2]; p++; *p = pts[3]; p++; *p = pts[3]; p++; *p = pts[0]; p++; // right side *p = pts[4]; p++; *p = pts[5]; p++; *p = pts[5]; p++; *p = pts[6]; p++; *p = pts[6]; p++; *p = pts[7]; p++; *p = pts[7]; p++; *p = pts[4]; p++; // across *p = pts[0]; p++; *p = pts[4]; p++; *p = pts[1]; p++; *p = pts[5]; p++; *p = pts[2]; p++; *p = pts[6]; p++; *p = pts[3]; p++; *p = pts[7]; p++; setVertexData(vertexData); setStride(kStride); setBounds(QVector3D(-50.0f, -50.0f, -50.0f), QVector3D(+50.0f, +50.0f, +50.0f)); setPrimitiveType(QQuick3DGeometry::PrimitiveType::Lines); addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, QQuick3DGeometry::Attribute::F32Type); }