Hello Qt Quick 3D Example
// Copyright (C) 2020 The Qt Company Ltd. // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause #include "imageinstancetable.h" #include <math.h> #include <QMatrix4x4> #include <QColor> #include <QImage> #include <QQmlFile> ImageInstanceTable::ImageInstanceTable(QQuick3DObject *parent) : QQuick3DInstancing(parent) { } ImageInstanceTable::~ImageInstanceTable() { } int ImageInstanceTable::gridSize() const { return m_gridSize; } float ImageInstanceTable::gridSpacing() const { return m_gridSpacing; } QString ImageInstanceTable::image() const { return m_imageSource; } void ImageInstanceTable::setGridSize(int gridSize) { if (m_gridSize == gridSize) return; m_gridSize = gridSize; emit gridSizeChanged(m_gridSize); markDirty(); m_dirty = true; } void ImageInstanceTable::setGridSpacing(float gridSpacing) { if (qFuzzyCompare(m_gridSpacing, gridSpacing)) return; m_gridSpacing = gridSpacing; emit gridSpacingChanged(m_gridSpacing); markDirty(); m_dirty = true; } void ImageInstanceTable::setImage(QString image) { if (m_imageSource == image) return; m_imageSource = image; emit imageChanged(m_imageSource); markDirty(); m_dirty = true; } QByteArray ImageInstanceTable::getInstanceBuffer(int *instanceCount) { if (m_dirty) { QImage image(m_imageSource); if (image.isNull()) qWarning() << "Could not load image" << m_imageSource; m_instanceData.resize(0); image = image.scaledToWidth(m_gridSize, Qt::SmoothTransformation); int instanceNumber = 0; for (int blockX = 0; blockX < image.width(); ++blockX) { float xPos = m_gridSpacing * (blockX - m_gridSize/2); for (int blockY = 0; blockY < image.width(); ++blockY) { QColor color = image.pixel(blockX, blockY); float yPos = -m_gridSpacing * (blockY - m_gridSize/2); float zPos = 10 * m_gridSpacing * (color.lightnessF() - 1.0); auto entry = calculateTableEntry({xPos,yPos,zPos}, {1.0, 1.0, 1.0}, {0,0,0}, color, {}); m_instanceData.append(reinterpret_cast<const char *>(&entry), sizeof(entry)); instanceNumber++; } } m_instanceCount = instanceNumber; m_dirty = false; } if (instanceCount) *instanceCount = m_instanceCount; return m_instanceData; }