Compiling Qwtplot3d in Qt Creator was relatively smooth. I've ended up with the files libqwtplot3d.lib, libqwtplot3dd.lib, qwtplot3d.dll and qwtplot3dd.dll (located in a subdirectory to the debug build folder). Using the library, however, is more problematic.

As a test, I've created a project with a pushbutton, and connected the click event of this button to the code

@1.SurfacePlot *plot3 = new SurfacePlot(this);@

When clicking the button, my program crashes with the error message "QWidget: Must construct a QApplication before a QPaintDevice", even though I've already did construct my QApplication back in main.cpp. It's quite similar to the error in this thread, but as far as I can tell I'm building both the libraries and my test project in debug mode: http://qt-project.org/forums/viewthread/12838

My first thought was that it was a user error, so I proceeded to test the example projects that are distributed with Qwtplot3d. I did get them to build after a few minor modifications, but they all crash immediately with the text "The program has unexpectedly finished."

I'm using Qt Creator with Qt 5 on Windows, with the mingw compiler.

Any suggestions as to where I go from here? Does anybody know of any known issues with Qwtplot3d combined with Qt 5?

Below is the first part of the .pro file of my test project. Am I doing something wrong when linking to the library?

@QT += core gui
QT += printsupport
QT += opengl

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

INCLUDEPATH += "D:/Qt/qwtplot3d/include"
LIBS += D:/Qt/build-qwtplot3d-Desktop_Qt_5_1_0_MinGW_32bit-Debug/lib/qwtplot3d.dll

TARGET = EngineMatch_1
TEMPLATE = app@

Grateful for any help or advice. I'm quite stuck at the moment.