PluginManager in Mitsuba2

[mitsuba-renderer]

PluginManager in Mitsuba2

[fangchangma]

It would be great to add a minimal working example of how to create a scene directly in Python (rather than loading an XML file).

[Speierers]

The current release doesn't implement python bindings for the PluginManager class. This is likely to come in a future release.

In the meantime, the only way to create a scene is generate an XML file and load it.

[arpit15]

@Speierers I took a stab at it. I am able to create a scene in python with classes that are constructible in python(SamplingIntegrator, Sensor, Emitter) and render a scene. However, I am the not able to create a scene which all the supported xml tags.
The problem has been that I need access to base class ptr to call PluginManager::create_object. For ex: to create HDRFilm I need access to Film::m_class. On digging deeper in xml.cpp, I found that it has a variable tag_class which stores all the base class pointers.
Can you guide me on how to access base class ptr to make a call to PluginManager::create_object for all the tags supported in Mitsuba?

[Speierers]

Hi @arpit15,
Thanks for looking into this!
At this point it would be easier to open a PR so I could have a look a your code to guide you further.

[arpit15]

I have created a PR here.
There is a lot of unnecessary code on python side. A better way would be to have a dictionary like tag_class in xml.cpp and use the property like node_name to pass in a lambda function in plugin_v.cpp. However, I can't seem to figure out how to get access to class ptr as done in xml.cpp

[Speierers]

Thanks @arpit15. I am closing this as further discussions should take place in the PR from now.