Select operator that takes multiple selected face regions and
selects any number of matching regions (when they have distinguishing features to isolate them).
UI access next.
Modeling tool to cut intersections into geometry (like boolean, without calculating inside/outside).
Faces are split along intersections, leaving new edges selected.
Access from Face menu.
Now the bevel tool, modifier, and internal operator have a material
slot # parameter that the user can set. If left at default of -1,
behavior is as current -- bevel face material is taken from the
closest original face (this may be ambiguous). If material slot
is >= 0, it gives the material slot index number for the material
to use.
If the side of a beveled edge hit another vertex, the offset
amount reset to zero. This was the result of commit rB1582dd5e4d7c
which clamped the amount to zero to avoid creating spikes with
obtuse angles. Now we clamp the amount to the closest end of
the edge to where the amount wants to be.
Also fixes the first part of T40365.
With very small meshes or very small bevel amounts, the bevel
profile would be flat even if a round one was requested.
Problem was that the code was checking the length of a cross
product for closeness to zero to test coplanarity. Needed
to normalize things before making that test to account for scale.
When doing a 'weld' type join where there are two non-beveled edges
in the same plane one beveled one but not the other, then there
should be a curved profile; bug was creating a straight one.
Used a different technique to resolve "impossible" offset cases
that makes more consistency. Also changed the plane in which
the profile lies for the case with only one beveled edge and
more than 3 other edges.
When rebuilding the polygons that touch bevel-involved vertices,
need to copy the edge attributes from corresponding original edges.
Special treatment of corner segments, to maintain continuity of
smooth and seam attributes.
Another fix: if have four meeting edges, two opposite ones beveled
and the other two not, propgate the non-beveled-edges attributes
across the line that joins them (perpendicular to the bevel).
Turned out there was still quite a few cases were indices were set dirty,
but elem_index_dirty was not tagged accordingly (mostly for BM_LOOP,
but a few others as well). So probably this crash was not the only one
hidden here.
Hopefully all possible cases were catched this time!
This updates the fix in rB27db75363, which had to be undone
because it broke other bevels.
It also fixes cases where edges went away went doing vertex
bevel on vertices with some wire edges.
The test for wire edges when reattaching was wrong, because
some newly made edges are wire at the point of the test.
This made some duplicate edges.
Need to track the original wire edges a different way.
Now code explicity excludes wire edges from beveling
and reattaches the wire edges to one of the newly
created vertices after beveling.
Also fixes a bug where vertex-beveling a wire-edge-only
vertex would not reattach the wire edges.
