Qt文档阅读笔记-Qt Quick 3D - Simple Example解析

程序运行截图如下：

还是动的。

官方出这篇博文的目的是如何教我们使用Qt Quick 3D去渲染简单的场景。

 

首先是设置其场景。

在main.qml文件中设置整个场景，导入QtQuick3D组建，用于使用各种3D数据类型：

import QtQuick3D 1.14Window {id: windowwidth: 1280height: 720visible: trueView3D {id: viewanchors.fill: parent//! [environment]environment: SceneEnvironment {clearColor: "skyblue"backgroundMode: SceneEnvironment.Color}//! [environment]//! [camera]PerspectiveCamera {position: Qt.vector3d(0, 200, -300)rotation: Qt.vector3d(30, 0, 0)}//! [camera]//! [light]DirectionalLight {rotation: Qt.vector3d(30, 70, 0)}//! [light]//! [objects]Model {position: Qt.vector3d(0, -200, 0)source: "#Cylinder"scale: Qt.vector3d(2, 0.2, 1)materials: [ DefaultMaterial {diffuseColor: "red"}]}Model {position: Qt.vector3d(0, 150, 0)source: "#Sphere"materials: [ DefaultMaterial {diffuseColor: "blue"}]SequentialAnimation on y {loops: Animation.InfiniteNumberAnimation {duration: 3000to: -150from: 150easing.type:Easing.InQuad}NumberAnimation {duration: 3000to: 150from: -150easing.type:Easing.OutQuad}}}//! [objects]}}

定义了场景所处的环境。在这个例子中将background的颜色改成了‘skyblue’。

environment: SceneEnvironment {clearColor: "skyblue"backgroundMode: SceneEnvironment.Color}

随后定义了场景中的相机。在此官方实例中使用了PerspectiveCamera充当相机，将相机向后移，这个后是指人倒退向后这个，并且给一个看的角度

PerspectiveCamera {position: Qt.vector3d(0, 200, -300)rotation: Qt.vector3d(30, 0, 0)}

在画物体前，还需要一个光源去照，在物理里面，只有光照到物体上，反射的光进入眼睛才会有颜色，没有光就是一坨黑。

DirectionalLight {rotation: Qt.vector3d(30, 70, 0)}

其次是画简单的物体。

画一个用红色圆柱弄的圆盘，并且画一个球，这个球有一些动态效果

Model {position: Qt.vector3d(0, -200, 0)source: "#Cylinder"scale: Qt.vector3d(2, 0.2, 1)materials: [ DefaultMaterial {diffuseColor: "red"}]}Model {position: Qt.vector3d(0, 150, 0)source: "#Sphere"materials: [ DefaultMaterial {diffuseColor: "blue"}]SequentialAnimation on y {loops: Animation.InfiniteNumberAnimation {duration: 3000to: -150from: 150easing.type:Easing.InQuad}NumberAnimation {duration: 3000to: 150from: -150easing.type:Easing.OutQuad}}}

源码如下：

simple.pro

QT += quick quick3d-privatetarget.path = $$[QT_INSTALL_EXAMPLES]/quick3d/simple INSTALLS += targetSOURCES += \main.cppRESOURCES += \qml.qrcOTHER_FILES += \doc/src/*.*

main.cpp

#include <QGuiApplication> #include <QQmlApplicationEngine>#include <QtGui> #include <QtQuick3D/private/qquick3dviewport_p.h>int main(int argc, char *argv[]) {QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);QGuiApplication app(argc, argv);QSurfaceFormat::setDefaultFormat(QQuick3DViewport::idealSurfaceFormat(4));QQmlApplicationEngine engine;engine.load(QUrl(QStringLiteral("qrc:/main.qml")));if (engine.rootObjects().isEmpty())return -1;return app.exec(); }

main.qml

import QtQuick 2.14 import QtQuick.Window 2.14 import QtQuick3D 1.14Window {id: windowwidth: 1280height: 720visible: trueView3D {id: viewanchors.fill: parent//! [environment]environment: SceneEnvironment {clearColor: "skyblue"backgroundMode: SceneEnvironment.Color}//! [environment]//! [camera]PerspectiveCamera {position: Qt.vector3d(0, 200, -300)rotation: Qt.vector3d(30, 0, 0)}//! [camera]//! [light]DirectionalLight {rotation: Qt.vector3d(30, 70, 0)}//! [light]//! [objects]Model {position: Qt.vector3d(0, -200, 0)source: "#Cylinder"scale: Qt.vector3d(2, 0.2, 1)materials: [ DefaultMaterial {diffuseColor: "red"}]}Model {position: Qt.vector3d(0, 150, 0)source: "#Sphere"materials: [ DefaultMaterial {diffuseColor: "blue"}]SequentialAnimation on y {loops: Animation.InfiniteNumberAnimation {duration: 3000to: -150from: 150easing.type:Easing.InQuad}NumberAnimation {duration: 3000to: 150from: -150easing.type:Easing.OutQuad}}}//! [objects]} }

 

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