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Tweaking e.g. a field strength would then not use the curve/surface normal anymore [but the object center instead]. If a curve has a forcefield with effector shape Curve (in code its shape is PFIELD_SHAPE_SURFACE then), it wil get a SurfaceModifier. Changing properties will free the SurfaceModifierData's bvhtree and mesh And these dont get copied along when doing the CoW copy, these are explicitly set to NULL. So this was also failing for meshes, not just curves. Without the mesh & bvhtree though, get_effector_data() will not set the EffectorData's normal correctly (it is closest_point_on_surface() which does this). And without the right EffectorData's normal, the effector will of course work unexpected. Going in and out of editmode made this work because that goes down this route: - BKE_object_handle_data_update - BKE_displist_make_curveTypes - do_makeDispListCurveTypes - curve_calc_modifiers_post -- BKE_mesh_new_nomain_from_curve_displist -- we then have our desired updated mesh from the curve -- this will also call the SurfaceModifiers deformVerts [which - given we have a valid mesh - will update the bvhtree properly] Also note that _animating_ the effector actually works, (have not done the deep dive why this works, assume the curve geometry is updated in this case) So, now just carefully tag the curve ID_RECALC_GEOMETRY in rna_FieldSettings_update for this specific case. Maniphest Tasks: T84623 Differential Revision: https://developer.blender.org/D10092
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.