Root of the issue goes to the fact that bevel list calculation might drop some points
if they're at the same position. This made spline length calculation goes wrong.
Now the length of the bevel segments is stored in the bevel list, so values are
always reliable.
Initial patch by Lukas Treyer with some tweaks from me.
Commits early in this year (to save some space) broke this. Hopefully this time
it works in all cases - lastCageIndex is no more influenced by realtime/edit active states.
Also, inactivate buttons instead of hiding them, can be useful to set those data
even though it does not have any immediate effect.
Took the opportunity to switch cage buttons to RNA, btw.
Indeed, constructive modifiers are highly likely to modify CDLayers like vgroups or vcols!
See vertexgroup2.blend file ({F93770}) in T40523, especially obvious with subsurf modifier.
Changes to ED_node_shader_default() were reverted since the code there was actually
not suitable for setting up the default line style node tree properly.
The issue is that we've got hell with DEBUG and _DEBUG,
theu're defined really inconsistent acros CMake and SCons.
Used more reliable NDEBUG definition for IDP_spit.
The issue was caused by NLA evaluation without actions not setting
id's flag as updated (as that's happening when action writes data
to the ID datablock).
Added the same flag set for the NLA evaluation as what's happening
for actions.
The issue was caused by the render engine loading edit mesh, which re-allocates
mesh array which might be referenced by other object's derived meshed.
Worst thing about this is that updating render engine happens from the end of
scene update function, after all the objects are updated and so. This is needed
so render engine gets the update objects which is correct.
The only proper way to solve the issue is to make it so viewport engine does not
leave objects in inconsistent state, meaning nobody will reference to freed data.
In order to reach this we do edit mesh loading before running objects update so
all the objects which uses that mesh will have proper references in the derived
mesh.
This also solves old creepyness which happened before when having single object
in edit mode. tweaking it will calculate derived mesh as a part of scene update,
then this derived mesh will be freed by edit mesh loading and viewport will be
creating derived mesh again.
Now render engine is expected to do nothing with meshes which are in edit mode,
but they still need to load edit data for non0meshes. It's not really easy to
do from the BKE level because needed functions are implemented in the editor.
Thanks Campbell for the review!
Differential Revision: https://developer.blender.org/D697
