[Bf-committers] Python callbacks and keeping properties in sync

[Wenzel Jakob]

Hello all,

I am currently designing a rendering backend that integrates Mitsuba (a 
physically based renderer) with Blender 2.56a based on Doug Hammond's 
extensions framework.

One of the issues I am periodically facing is synchronization between 
the Blender and Mitsuba interpretations of the scene. For instance, 
Blender Internal and Mitsuba have wildly different material 
configurations, and hence the rendering plugin adds custom UI panels to 
configure all materials.

However, there is still a bit of overlap with Blender Internal. It would 
be great if it was possible to "react" to property changes in a material 
so that they can be forwarded to the other respective material 
implementation (where it makes sense). For instance: if the user 
specifies a diffuse gray BI material, that could easily be replicated in 
the Mitsuba material panel.

I remember that somebody was working on Python-based property callbacks, 
which could potentially be used to implement such a feature. I'm curious 
to hear about the state of this work.

Thank you,
Wenzel