Hi, I'm writing here following a chat I had with Campbell about recent changes that made impossible to call operators from the 'draw' section of custom panels. He suggested I submit here my problems with this behaviour.
This technique is used since a previous change where directly writing into properties has been forbidden. I understand that bad coding could lead to some deadlocks or infinite loops but having the ability for a script to react to property changes is quite important and not achievable otherwise due to the lack of callbacks (so far I know). Here's the situation I'm facing: I've written an unofficial (both from Blender and Refractive Software point of view) addon to allow smooth export of blender scene/anim to the unbiased render Octane. From the user perspective it consists of 3 custom panels, replacing the default 'render', 'material' and 'texture' ones. I'm proud to say it has became quite popular and allows a nice workflow to happen. The need for tracking properties is due to my wish to prevent the user accessing or modifying values that can't be taken in account by Octane. For instance the custom texture panel forces the type to 'Image', coordinates to 'UV' and the Projection to 'Flat', as these are the only values that can work with Octane (and are hidden by the custom panel). Another example is the main 'render' panel automatically resetting the x and y aspect ratio to 1 as Octane only renders square pixels. This last one is very important for the camera view in Blender to match final result in Octane. Doing those operations in the 'draw' section may have some limitations but seems to properly make the job (for instance I don't care if a user loads an old scene with non proper values, I only expect my script to fix these once they're presented to the panel - good enough for me). According to Campbell it's seems there's no suitable workaround, so I'm asking you don't prevent anymore operators to be called from the 'draw' section of panels until callbacks are available (or may be you have a working workaround available). Cheers, Lionel _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
