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Cloth: use the original vertex positions to build internal springs.

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In order to ensure correct operation of the rest shape key feature,
it's necessary to create a temporary copy of the mesh with rest
vertex positions to run the BVH lookup on. If the rest shape key
isn't used, there is no need for additional overhead.
This commit is contained in:
Alexander Gavrilov 2020-07-01 18:14:49 +03:00
parent f4f00661a5
commit 2788b0261c
1 changed files with 31 additions and 1 deletions
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32
source/blender/blenkernel/intern/cloth.c
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@ -43,6 +43,7 @@
#include "BKE_cloth.h"
#include "BKE_effect.h"
#include "BKE_global.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_modifier.h"
#include "BKE_pointcache.h"
@ -1270,6 +1271,21 @@ static void cloth_update_verts(Object *ob, ClothModifierData *clmd, Mesh *mesh)
}
}
/* Write rest vert locations to a copy of the mesh. */
static Mesh *cloth_make_rest_mesh(ClothModifierData *clmd, Mesh *mesh)
{
Mesh *new_mesh = BKE_mesh_copy_for_eval(mesh, false);
ClothVertex *verts = clmd->clothObject->verts;
MVert *mvert = new_mesh->mvert;
/* vertex count is already ensured to match */
for (unsigned i = 0; i < mesh->totvert; i++, verts++) {
copy_v3_v3(mvert[i].co, verts->xrest);
}
return new_mesh;
}
/* Update spring rest length, for dynamically deformable cloth */
static void cloth_update_spring_lengths(ClothModifierData *clmd, Mesh *mesh)
{
@ -1598,10 +1614,18 @@ static int cloth_build_springs(ClothModifierData *clmd, Mesh *mesh)
BVHTreeFromMesh treedata = {NULL};
unsigned int tar_v_idx;
BLI_bitmap *verts_used = NULL;
Mesh *tmp_mesh = NULL;
RNG *rng;
/* If using the rest shape key, it's necessary to make a copy of the mesh. */
if (clmd->sim_parms->shapekey_rest &&
!(clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_DYNAMIC_BASEMESH)) {
tmp_mesh = cloth_make_rest_mesh(clmd, mesh);
BKE_mesh_calc_normals(tmp_mesh);
}
verts_used = BLI_BITMAP_NEW(mvert_num * mvert_num, __func__);
BKE_bvhtree_from_mesh_get(&treedata, mesh, BVHTREE_FROM_LOOPTRI, 2);
BKE_bvhtree_from_mesh_get(&treedata, tmp_mesh ? tmp_mesh : mesh, BVHTREE_FROM_LOOPTRI, 2);
rng = BLI_rng_new_srandom(0);
for (int i = 0; i < mvert_num; i++) {
@ -1646,12 +1670,18 @@ static int cloth_build_springs(ClothModifierData *clmd, Mesh *mesh)
cloth_free_errorsprings(cloth, edgelist, spring_ref);
MEM_freeN(verts_used);
free_bvhtree_from_mesh(&treedata);
if (tmp_mesh) {
BKE_mesh_free(tmp_mesh);
}
return 0;
}
}
}
MEM_freeN(verts_used);
free_bvhtree_from_mesh(&treedata);
if (tmp_mesh) {
BKE_mesh_free(tmp_mesh);
}
BLI_rng_free(rng);
}