Sybren A. Stüvel
be8879718e
Blender can crash while rendering, when scene data is changed from within a `frame_change_pre` or `frame_change_post` callback function. This results in bug reports like T60094, T67627, and T73530. Until this is properly resolved, this limitation should be documented. No functional changes.
24 lines
906 B
Python
24 lines
906 B
Python
"""
|
|
Note on Altering Data
|
|
+++++++++++++++++++++
|
|
|
|
Altering data from handlers should be done carefully. While rendering the
|
|
``frame_change_pre`` and ``frame_change_post`` handlers are called from one
|
|
thread and the viewport updates from a different thread. If the handler changes
|
|
data that is accessed by the viewport, this can cause a crash of Blender. In
|
|
such cases, lock the interface (Render → Lock Interface or
|
|
:data:`bpy.types.RenderSettings.use_lock_interface`) before starting a render.
|
|
|
|
Below is an example of a mesh that is altered from a handler:
|
|
"""
|
|
|
|
def frame_change_pre(scene):
|
|
# A triangle that shifts in the z direction
|
|
zshift = scene.frame_current * 0.1
|
|
vertices = [(-1, -1, zshift), (1, -1, zshift), (0, 1, zshift)]
|
|
triangles = [(0, 1, 2)]
|
|
|
|
object = bpy.data.objects["The Object"]
|
|
object.data.clear_geometry()
|
|
object.data.from_pydata(vertices, [], triangles)
|