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Fix T94422: Shading/Normals break on array modifier caps 

The array modifier does not necessarily tag normals dirty.
If it doesnt, normals are recalculated "internally" using the offset ob
transform. This was happening for the array items, but not for the caps.

Now do the same thing for caps.

Maniphest Tasks: T94422

Differential Revision: https://developer.blender.org/D13681
This commit is contained in:
Philipp Oeser 2021-12-28 16:57:36 +01:00
parent 81879680e9
commit dfdc7c3f81
Notes: blender-bot 2023-02-14 06:00:51 +01:00 
Referenced by issue #88449: Blender LTS: Maintenance Task 2.93
Referenced by issue #88449, Blender LTS: Maintenance Task 2.93
Referenced by issue #94422, Shading/Normals break on array modifier caps
1 changed files with 15 additions and 3 deletions
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18
source/blender/modifiers/intern/MOD_array.c
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@ -285,7 +285,8 @@ static void mesh_merge_transform(Mesh *result,
int cap_nloops,
int cap_npolys,
int *remap,
int remap_len)
int remap_len,
const bool recalc_normals_later)
{
int *index_orig;
int i;
@ -305,6 +306,15 @@ static void mesh_merge_transform(Mesh *result,
mul_m4_v3(cap_offset, mv->co);
/* Reset MVert flags for caps */
mv->flag = mv->bweight = 0;
/* We have to correct normals too, if we do not tag them as dirty later! */
if (!recalc_normals_later) {
float no[3];
normal_short_to_float_v3(no, mv->no);
mul_mat3_m4_v3(cap_offset, no);
normalize_v3(no);
normal_float_to_short_v3(mv->no, no);
}
}
/* remap the vertex groups if necessary */
@ -711,7 +721,8 @@ static Mesh *arrayModifier_doArray(ArrayModifierData *amd,
start_cap_nloops,
start_cap_npolys,
vgroup_start_cap_remap,
vgroup_start_cap_remap_len);
vgroup_start_cap_remap_len,
use_recalc_normals);
/* Identify doubles with first chunk */
if (use_merge) {
dm_mvert_map_doubles(full_doubles_map,
@ -740,7 +751,8 @@ static Mesh *arrayModifier_doArray(ArrayModifierData *amd,
end_cap_nloops,
end_cap_npolys,
vgroup_end_cap_remap,
vgroup_end_cap_remap_len);
vgroup_end_cap_remap_len,
use_recalc_normals);
/* Identify doubles with last chunk */
if (use_merge) {
dm_mvert_map_doubles(full_doubles_map,