Blender has the ability to limit the scope of rendering – outlining a region the special render border and checking the Border checkbox on the Render – Dimensions tab in Properties window. If such frame is set – Blender render only a limited area of the image.
There are two ways to set render border via the Blender API:
All user-defined classes (panels, operators), registered in Blender API, exists only during Blender runs. After program close they are deleted from memory. Therefore, if some variables are defined in user classes, all of them will be reset after Blender restart.
However, sometimes it is necessary to use in Blender add-on variables with values that not be lost in the process of program restarting. To retain variables values, it needs to wrap them into special class – property, and attach to any object whose properties are stored in * .blend file.
Creating Blender Add-ons variables with values saved in blend-filesRead More »
User defined operator classes, inherited from bpy.types.Operator, are static. Accordingly, only static variables can be defined in them.
Static variable sampleVar definition in SampleClass class:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
class SampleClass(bpy.types.Operator): bl_idname = "sample.sample_class" sampleVar = 5 def execute(self, context): print(self.sampleVar) self.__class__.sampleVar += 1 print(self.sampleVar) print(self.__class__.sampleVar) def sampleFunc(): SampleClass.sampleVar += 1 print(SampleClass.sampleVar) |