25 lines
907 B
Python
25 lines
907 B
Python
"""
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Note on Altering Data
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+++++++++++++++++++++
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Altering data from handlers should be done carefully. While rendering the
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``frame_change_pre`` and ``frame_change_post`` handlers are called from one
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thread and the viewport updates from a different thread. If the handler changes
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data that is accessed by the viewport, this can cause a crash of Blender. In
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such cases, lock the interface (Render → Lock Interface or
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:data:`bpy.types.RenderSettings.use_lock_interface`) before starting a render.
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Below is an example of a mesh that is altered from a handler:
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"""
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def frame_change_pre(scene):
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# A triangle that shifts in the z direction
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zshift = scene.frame_current * 0.1
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vertices = [(-1, -1, zshift), (1, -1, zshift), (0, 1, zshift)]
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triangles = [(0, 1, 2)]
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object = bpy.data.objects["The Object"]
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object.data.clear_geometry()
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object.data.from_pydata(vertices, [], triangles)
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