Qt Quick 3D - Custom Geometry Example

/**************************************************************************** ** ** Copyright (C) 2020 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#include "examplegeometry.h" #include <QRandomGenerator> #include <QVector3D> ExampleTriangleGeometry::ExampleTriangleGeometry() { updateData(); } void ExampleTriangleGeometry::setNormals(bool enable) { if (m_hasNormals == enable) return; m_hasNormals = enable; emit normalsChanged(); updateData(); update(); } void ExampleTriangleGeometry::setNormalXY(float xy) { if (m_normalXY == xy) return; m_normalXY = xy; emit normalXYChanged(); updateData(); update(); } void ExampleTriangleGeometry::setUV(bool enable) { if (m_hasUV == enable) return; m_hasUV = enable; emit uvChanged(); updateData(); update(); } void ExampleTriangleGeometry::setUVAdjust(float f) { if (m_uvAdjust == f) return; m_uvAdjust = f; emit uvAdjustChanged(); updateData(); update(); } void ExampleTriangleGeometry::updateData() { clear(); int stride = 3 * sizeof(float); if (m_hasNormals) stride += 3 * sizeof(float); if (m_hasUV) stride += 2 * sizeof(float); QByteArray vertexData(3 * stride, Qt::Initialization::Uninitialized); float *p = reinterpret_cast<float *>(vertexData.data()); // a triangle, front face = counter-clockwise *p++ = -1.0f; *p++ = -1.0f; *p++ = 0.0f; if (m_hasNormals) { *p++ = m_normalXY; *p++ = m_normalXY; *p++ = 1.0f; } if (m_hasUV) { *p++ = 0.0f + m_uvAdjust; *p++ = 0.0f + m_uvAdjust; } *p++ = 1.0f; *p++ = -1.0f; *p++ = 0.0f; if (m_hasNormals) { *p++ = m_normalXY; *p++ = m_normalXY; *p++ = 1.0f; } if (m_hasUV) { *p++ = 1.0f - m_uvAdjust; *p++ = 0.0f + m_uvAdjust; } *p++ = 0.0f; *p++ = 1.0f; *p++ = 0.0f; if (m_hasNormals) { *p++ = m_normalXY; *p++ = m_normalXY; *p++ = 1.0f; } if (m_hasUV) { *p++ = 1.0f - m_uvAdjust; *p++ = 1.0f - m_uvAdjust; } setVertexData(vertexData); setStride(stride); setBounds(QVector3D(-1.0f, -1.0f, 0.0f), QVector3D(+1.0f, +1.0f, 0.0f)); setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles); addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, QQuick3DGeometry::Attribute::F32Type); if (m_hasNormals) { addAttribute(QQuick3DGeometry::Attribute::NormalSemantic, 3 * sizeof(float), QQuick3DGeometry::Attribute::F32Type); } if (m_hasUV) { addAttribute(QQuick3DGeometry::Attribute::TexCoordSemantic, m_hasNormals ? 6 * sizeof(float) : 3 * sizeof(float), QQuick3DGeometry::Attribute::F32Type); } } ExamplePointGeometry::ExamplePointGeometry() { updateData(); } void ExamplePointGeometry::updateData() { clear(); constexpr auto randomFloat = [](const float lowest, const float highest) -> float { return lowest + QRandomGenerator::global()->generateDouble() * (highest - lowest); }; constexpr int NUM_POINTS = 2000; constexpr int stride = 3 * sizeof(float); QByteArray vertexData; vertexData.resize(NUM_POINTS * stride); float *p = reinterpret_cast<float *>(vertexData.data()); for (int i = 0; i < NUM_POINTS; ++i) { *p++ = randomFloat(-5.0f, +5.0f); *p++ = randomFloat(-5.0f, +5.0f); *p++ = 0.0f; } setVertexData(vertexData); setStride(stride); setBounds(QVector3D(-5.0f, -5.0f, 0.0f), QVector3D(+5.0f, +5.0f, 0.0f)); setPrimitiveType(QQuick3DGeometry::PrimitiveType::Points); addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, QQuick3DGeometry::Attribute::F32Type); }