Crash on loading scene file after upgrading mitsuba version to 3.1.1

[sapo17]

mi.load_dict() throws an exception (i.e. causes material-optimizer to crash) if the loaded scene file does not contain the given parameter in mi_load_dict(). For example:

mi.load_dict("scene.xml", resx, resy): In this case if the scene.xml file does not define the resxand resy variables, mitsuba throws an XML error.

Another example:

mi.load_dict("scene.xml", resolution):

 File "c:\Users\saipc\OneDrive\Desktop\SAPO-DOX\Studium\UniWien\BachelorThesis\python\material-optimizer\material_optimizer_gui.py", line 35, in setScene
    self.scene = mi.load_file(
RuntimeError: ​[xml.cpp:1003] Unused parameter "resolution"!

[sapo17]

Current fix: material-optimizer requires that the loaded mitsuba file contains the following parameters:

• resx Refers to the width of the film (e.g. 512)
• resy: Refers to the height of the film (e.g. 512)
• integrator: Refers to the integrator of the scene (e.g. path)

[sapo17]

See commit