Moreover, qwtplot3d does not supply an SVG renderer. I have changed the code to throw an exception, and implemented code to display exceptions so it is more obvious to the user this is the case.
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Verified. Looks like it could be a failure to close the file.
The problem appears to be in the IO::save method of qwt_plot3d.
I will need to build a debug version of that library to see what's going on.
Basically PDF and postscript work - at least okular and gv think so (although okular is a little slow on rendering the PDF).
SVG is simply not implemented: see ApplicationWindow::exportGraph(), line 4747 of ApplicationWindow.cpp
Last edit: High Performance Coder 2015-07-04
Moreover, qwtplot3d does not supply an SVG renderer. I have changed the code to throw an exception, and implemented code to display exceptions so it is more obvious to the user this is the case.
fixed here