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Fix #109565: Array modifier changes the Root vertex of Skin modifier

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The merging behavior of the Array, Mirror, Screw modifiers has changed
since 4369627e71.

Before, only the customdata of the destination vertex was kept. Source
vertices were completely removed.

With 4369627e71, all vertices in the merge group (whether source or
destination) now have their customdata interpolated.

But this can cause problems for example with the root vertex customdata
of the skin modifier, where if only one of the vertices of the group of
vertices has this flag, the resulting one will also have it.

This commit restores the behavior for the vertices customdata and does
not interpolate it if `do_mix_vert_data` is false.

Pull Request: https://projects.blender.org/blender/blender/pulls/109627
This commit is contained in:
Germano Cavalcante
2023-07-06 15:05:33 +02:00
committed by Germano Cavalcante
parent 4731beec99
commit 74772c6920
5 changed files with 57 additions and 33 deletions
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9
source/blender/geometry/GEO_mesh_merge_by_distance.hh
View File

@@ -52,7 +52,14 @@ std::optional<Mesh *> mesh_merge_by_distance_connected(const Mesh &mesh,
* this is not supported and will likely generate corrupted geometry.
*
* \param vert_dest_map_len: The number of non '-1' values in `vert_dest_map`. (not the size)
* \param do_mix_vert_data: If true, the groups of vertices in the `vert_dest_map_len`, defined by
* source vertices with the same target plus the target vertex, will have their custom data
* interpolated into the resulting vertex. If false, only the custom data of the target vertex will
* remain.
*/
Mesh *mesh_merge_verts(const Mesh &mesh, MutableSpan<int> vert_dest_map, int vert_dest_map_len);
Mesh *mesh_merge_verts(const Mesh &mesh,
MutableSpan<int> vert_dest_map,
int vert_dest_map_len,
const bool do_mix_vert_data);
} // namespace blender::geometry

74
source/blender/geometry/intern/mesh_merge_by_distance.cc
View File

@@ -87,6 +87,7 @@ struct WeldPoly {
struct WeldMesh {
/* Group of vertices to be merged. */
Array<int> vert_group_map; /* Maps the vertex group offset from the target vert index. */
Array<int> vert_groups_offs;
Array<int> vert_groups_buffer;
@@ -356,14 +357,15 @@ static Vector<int> weld_vert_ctx_alloc_and_setup(MutableSpan<int> vert_dest_map,
static void weld_vert_groups_setup(Span<int> wvert,
Span<int> vert_dest_map,
const int vert_kill_len,
MutableSpan<int> r_vert_groups_map,
Array<int> &r_vert_groups_map,
Array<int> &r_vert_groups_buffer,
Array<int> &r_vert_groups_offs)
{
r_vert_groups_map.reinitialize(vert_dest_map.size());
r_vert_groups_map.fill(OUT_OF_CONTEXT);
const int vert_groups_len = wvert.size() - vert_kill_len;
/* Add +1 to allow calculation of the length of the last group. */
const int vert_groups_len = wvert.size() - vert_kill_len;
r_vert_groups_offs.reinitialize(vert_groups_len + 1);
r_vert_groups_offs.fill(0);
@@ -1374,7 +1376,7 @@ static void weld_poly_find_doubles(const Span<int> corner_verts,
static void weld_mesh_context_create(const Mesh &mesh,
MutableSpan<int> vert_dest_map,
const int vert_kill_len,
MutableSpan<int> r_vert_group_map,
const bool do_vert_group,
WeldMesh *r_weld_mesh)
{
const Span<int2> edges = mesh.edges();
@@ -1417,12 +1419,14 @@ static void weld_mesh_context_create(const Mesh &mesh,
edges.size(),
r_weld_mesh);
weld_vert_groups_setup(wvert,
vert_dest_map,
vert_kill_len,
r_vert_group_map,
r_weld_mesh->vert_groups_buffer,
r_weld_mesh->vert_groups_offs);
if (do_vert_group) {
weld_vert_groups_setup(wvert,
vert_dest_map,
vert_kill_len,
r_weld_mesh->vert_group_map,
r_weld_mesh->vert_groups_buffer,
r_weld_mesh->vert_groups_offs);
}
weld_edge_groups_setup(edges.size(),
r_weld_mesh->edge_kill_len,
@@ -1545,7 +1549,8 @@ static void customdata_weld(
static Mesh *create_merged_mesh(const Mesh &mesh,
MutableSpan<int> vert_dest_map,
const int removed_vertex_count)
const int removed_vertex_count,
const bool do_mix_vert_data)
{
#ifdef USE_WELD_DEBUG_TIME
SCOPED_TIMER(__func__);
@@ -1557,10 +1562,9 @@ static Mesh *create_merged_mesh(const Mesh &mesh,
const int totvert = mesh.totvert;
const int totedge = mesh.totedge;
Array<int> vert_group_map(totvert);
WeldMesh weld_mesh;
weld_mesh_context_create(mesh, vert_dest_map, removed_vertex_count, vert_group_map, &weld_mesh);
weld_mesh_context_create(
mesh, vert_dest_map, removed_vertex_count, do_mix_vert_data, &weld_mesh);
const int result_nverts = totvert - weld_mesh.vert_kill_len;
const int result_nedges = totedge - weld_mesh.edge_kill_len;
@@ -1576,15 +1580,23 @@ static Mesh *create_merged_mesh(const Mesh &mesh,
/* Vertices. */
/* Be careful when setting values to this array as it uses the same buffer as #vert_group_map.
* This map will be used to adjust edges and loops to point to new vertex indices. */
MutableSpan<int> vert_final_map = vert_group_map;
MutableSpan<int> vert_final_map;
Array<int> vert_final_map_local;
if (!weld_mesh.vert_group_map.is_empty()) {
/* Be careful when setting values to this array as it uses the same buffer as #vert_group_map.
* This map will be used to adjust edges and loops to point to new vertex indices. */
vert_final_map = weld_mesh.vert_group_map;
}
else {
vert_final_map_local.reinitialize(totvert);
vert_final_map = vert_final_map_local;
}
int dest_index = 0;
for (int i = 0; i < totvert; i++) {
int source_index = i;
int count = 0;
while (i < totvert && vert_group_map[i] == OUT_OF_CONTEXT) {
while (i < totvert && vert_dest_map[i] == OUT_OF_CONTEXT) {
vert_final_map[i] = dest_index + count;
count++;
i++;
@@ -1596,15 +1608,16 @@ static Mesh *create_merged_mesh(const Mesh &mesh,
if (i == totvert) {
break;
}
if (vert_group_map[i] != ELEM_MERGED) {
int *src_indices;
int count;
{
int *wgroup = &weld_mesh.vert_groups_offs[vert_group_map[i]];
src_indices = &weld_mesh.vert_groups_buffer[*wgroup];
count = *(wgroup + 1) - *wgroup;
if (vert_dest_map[i] == i) {
if (do_mix_vert_data) {
int *group_offs = &weld_mesh.vert_groups_offs[weld_mesh.vert_group_map[i]];
int *src_indices = &weld_mesh.vert_groups_buffer[*group_offs];
int count = *(group_offs + 1) - *group_offs;
customdata_weld(&mesh.vdata, &result->vdata, src_indices, count, dest_index);
}
else {
CustomData_copy_data(&mesh.vdata, &result->vdata, i, dest_index, 1);
}
customdata_weld(&mesh.vdata, &result->vdata, src_indices, count, dest_index);
vert_final_map[i] = dest_index;
dest_index++;
}
@@ -1770,7 +1783,7 @@ std::optional<Mesh *> mesh_merge_by_distance_all(const Mesh &mesh,
return std::nullopt;
}
return create_merged_mesh(mesh, vert_dest_map, vert_kill_len);
return create_merged_mesh(mesh, vert_dest_map, vert_kill_len, true);
}
struct WeldVertexCluster {
@@ -1869,12 +1882,15 @@ std::optional<Mesh *> mesh_merge_by_distance_connected(const Mesh &mesh,
}
}
return create_merged_mesh(mesh, vert_dest_map, vert_kill_len);
return create_merged_mesh(mesh, vert_dest_map, vert_kill_len, true);
}
Mesh *mesh_merge_verts(const Mesh &mesh, MutableSpan<int> vert_dest_map, int vert_dest_map_len)
Mesh *mesh_merge_verts(const Mesh &mesh,
MutableSpan<int> vert_dest_map,
int vert_dest_map_len,
const bool do_mix_vert_data)
{
return create_merged_mesh(mesh, vert_dest_map, vert_dest_map_len);
return create_merged_mesh(mesh, vert_dest_map, vert_dest_map_len, do_mix_vert_data);
}
/** \} */

2
source/blender/modifiers/intern/MOD_array.cc
View File

@@ -826,7 +826,7 @@ static Mesh *arrayModifier_doArray(ArrayModifierData *amd,
if (tot_doubles > 0) {
Mesh *tmp = result;
result = geometry::mesh_merge_verts(
*tmp, MutableSpan<int>{full_doubles_map, result->totvert}, tot_doubles);
*tmp, MutableSpan<int>{full_doubles_map, result->totvert}, tot_doubles, false);
BKE_id_free(nullptr, tmp);
}
MEM_freeN(full_doubles_map);

2
source/blender/modifiers/intern/MOD_mirror.cc
View File

@@ -87,7 +87,7 @@ static Mesh *mirror_apply_on_axis(MirrorModifierData *mmd,
if (vert_merge_map_len) {
Mesh *tmp = result;
result = geometry::mesh_merge_verts(
*tmp, MutableSpan<int>{vert_merge_map, result->totvert}, vert_merge_map_len);
*tmp, MutableSpan<int>{vert_merge_map, result->totvert}, vert_merge_map_len, false);
BKE_id_free(nullptr, tmp);
}
MEM_freeN(vert_merge_map);

3
source/blender/modifiers/intern/MOD_screw.cc
View File

@@ -180,7 +180,8 @@ static Mesh *mesh_remove_doubles_on_axis(Mesh *result,
* Therefore the duplicate polygon test can be skipped. */
result = geometry::mesh_merge_verts(*tmp,
MutableSpan<int>{full_doubles_map, result->totvert},
int(tot_doubles * (step_tot - 1)));
int(tot_doubles * (step_tot - 1)),
false);
BKE_id_free(nullptr, tmp);
MEM_freeN(full_doubles_map);