Qt3D minimal example using CMake
Overview
With Qt5.7 the Qt3D module is now a part of the Qt library, and it is a fully functional scene graph module. This post will provide a minimal example window and a scene graph (torus) by using CMake instead of QMake.
Note: the below example requires Qt5.7 version as a minimum Qt version.
CMAkeLists.txt file
cmake_minimum_required(VERSION 2.8.11)
project(qt3DExample)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
# include necessary qt3d modules
find_package(Qt5 REQUIRED COMPONENTS Core Gui Widgets 3DCore 3DExtras 3DRender 3DInput)
set(SOURCES
main.cpp
)
add_executable(${PROJECT_NAME} ${SOURCES})
# link the qt3d libraries
target_link_libraries(${PROJECT_NAME}
Qt5::Core
Qt5::Gui
Qt5::Widgets
Qt5::3DCore
Qt5::3DExtras
Qt5::3DRender
Qt5::3DInput
)main.cpp file
As a scene graph, we will place a single torus on the scene and will use some basic scene graph componenets connected to it: transform, material, geometry type. This example is a simplified version of the Qt 3D: Simple C++ Example.
#include <QGuiApplication>
#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>
#include <Qt3DCore/QAspectEngine>
#include <Qt3DRender/qrenderaspect.h>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QMaterial>
#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QTorusMesh>
#include <Qt3DExtras/QOrbitCameraController>
#include <Qt3DExtras/QPhongMaterial>
Qt3DCore::QEntity* createTestScene()
{
Qt3DCore::QEntity* root = new Qt3DCore::QEntity;
Qt3DCore::QEntity* torus = new Qt3DCore::QEntity(root);
Qt3DExtras::QTorusMesh* mesh = new Qt3DExtras::QTorusMesh;
mesh->setRadius(5);
mesh->setMinorRadius(1);
mesh->setRings(100);
mesh->setSlices(20);
Qt3DCore::QTransform* transform = new Qt3DCore::QTransform;
// transform->setScale3D(QVector3D(1.5, 1, 0.5));
transform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1,0,0), 45.f ));
Qt3DRender::QMaterial* material = new Qt3DExtras::QPhongMaterial(root);
torus->addComponent(mesh);
torus->addComponent(transform);
torus->addComponent(material);
return root;
}
int main(int argc, char* argv[])
{
QGuiApplication app(argc, argv);
Qt3DExtras::Qt3DWindow view;
Qt3DCore::QEntity* scene = createTestScene();
// camera
Qt3DRender::QCamera *camera = view.camera();
camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
camera->setPosition(QVector3D(0, 0, 40.0f));
camera->setViewCenter(QVector3D(0, 0, 0));
// manipulator
Qt3DExtras::QOrbitCameraController* manipulator = new Qt3DExtras::QOrbitCameraController(scene);
manipulator->setLinearSpeed(50.f);
manipulator->setLookSpeed(180.f);
manipulator->setCamera(camera);
view.setRootEntity(scene);
view.show();
return app.exec();
}Example screenshot
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