The issue was introduced by b35831ad6c.
Since that commit `tree->boundary` will always be non-nullptr, even
when the target mesh had no boundaries. Some code was still relying
on the fact that `tree->boundary != nullptr` means the mesh has
boundary.
Update shrinkwrap code for this fact, avoiding access past array
boundaries.
Pull Request: https://projects.blender.org/blender/blender/pulls/120054
This is mainly to make the computation threadsafe, to allow computing
the cache on a const mesh, and also to decrease the cost of copying
meshes. Computing caches on const meshes generally makes it easier
to avoid copying meshes unnecessarily in other ways, which would be
useful for some pending fixes and cleanups to modifier evaluation.
- Use C++ Array type
- Move to blender::bke::shrinkwrap namespace
- Use edge_is_boundary instead of edge_mode in a few places
- Avoid writing to edge_mode unnecessarily
Make the naming consistent with the recent change from "loop" to
"corner". Avoid the need for a special type for these triangles by
conveying the semantics in the naming instead.
- `looptris` -> `corner_tris`
- `lt` -> `tri` (or `corner_tri` when there is less context)
- `looptri_index` -> `tri_index` (or `corner_tri_index`)
- `lt->tri[0]` -> `tri[0]`
- `Span<MLoopTri>` -> `Span<int3>`
- `looptri_faces` -> `tri_faces` (or `corner_tri_faces`)
If we followed the naming pattern of "corner_verts" and "edge_verts"
exactly, we'd probably use "tri_corners" instead. But that sounds much
worse and less intuitive to me.
I've found that by using standard vector types for this sort of data,
the commonalities with other areas become much clearer, and code ends
up being naturally more data oriented. Besides that, the consistency
is nice, and we get to mostly remove use of `DNA_meshdata_types.h`.
Pull Request: https://projects.blender.org/blender/blender/pulls/116238
Convert shrinkwrap data arrays to use C++ arrays and BitVector,
use references in "EditMeshData" code, and store both structs
with `std::unique_ptr` instead of a raw allocation.
Sergey Sharybin
Hans Goudey
Campbell Barton
Lukas Tönne
Hans Goudey