blender-core-runtime

Use when dealing with Blender Python runtime behavior -- mathutils, threading, handlers, timers, or crashes after undo/redo. Prevents the #1 runtime crash: using threading for bpy operations instead of bpy.app.timers, or caching bpy.data references across undo boundaries. Covers Vector/Matrix/Quaternion, KDTree, BVHTree, @persistent handlers, bpy.msgbus subscriptions, and background mode limitations. Keywords: mathutils, threading, undo, ReferenceError, bpy.app.timers, @persistent, bpy.msgbus, KDTree, BVHTree, background mode, Blender crash, startup script, auto-run, run on open, Blender freezes.

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