Qt Quick 3D - Custom Geometry Example
 QT += quick quick3d
 CONFIG += qmltypes
 QML_IMPORT_NAME = CustomGeometryExample
 QML_IMPORT_MAJOR_VERSION = 1
 target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/customgeometry
 INSTALLS += target
 SOURCES += \
     main.cpp \
     examplegeometry.cpp
 HEADERS += \
     examplegeometry.h
 qml_resources.files = \
     qmldir \
     Main.qml \
     TorusMesh.qml \
     qt_logo_rect.png
 qml_resources.prefix = /qt/qml/CustomGeometryExample/
 RESOURCES += qml_resources
 OTHER_FILES += \
     doc/src/*.*