diff options
author | Bastien Montagne <montagne29@wanadoo.fr> | 2018-01-24 13:13:49 +0300 |
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committer | Bastien Montagne <montagne29@wanadoo.fr> | 2018-01-24 13:22:35 +0300 |
commit | ad046efa7966a0d1d201ca92ad8352ccfaed2ca3 (patch) | |
tree | 094eec984abf74785d1e3da7ed5f87a4042e5cbe | |
parent | 9112cceb5ee9846a0e223ab7f2c632acae7f8a4d (diff) |
Fix T53551: Weight paint crash when subsurf modifier is not first (master not 2.79).
We can only support painting from subsurf DM in a limited subset of
cases, others (like multiple subsurf, or topology-modyfying ones,
break mapping to original geometry).
This is not the most ideal fix (ideally, we should always be able to get
a mapping to original geometry from any point in modifiers stack...).
-rw-r--r-- | source/blender/blenkernel/intern/subsurf_ccg.c | 83 |
1 files changed, 67 insertions, 16 deletions
diff --git a/source/blender/blenkernel/intern/subsurf_ccg.c b/source/blender/blenkernel/intern/subsurf_ccg.c index 5d0f06e95ec..624a8975f5e 100644 --- a/source/blender/blenkernel/intern/subsurf_ccg.c +++ b/source/blender/blenkernel/intern/subsurf_ccg.c @@ -67,6 +67,7 @@ #include "BKE_global.h" #include "BKE_mesh.h" #include "BKE_mesh_mapping.h" +#include "BKE_modifier.h" #include "BKE_multires.h" #include "BKE_paint.h" #include "BKE_scene.h" @@ -4444,7 +4445,7 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm) { CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm; CCGKey key; - int numGrids, grid_pbvh; + int numGrids; CCG_key_top_level(&key, ccgdm->ss); @@ -4456,35 +4457,85 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm) if (!ob->sculpt) return NULL; - /* In vwpaint, we always use a grid_pbvh for multires/subsurf */ - grid_pbvh = (!(ob->mode & OB_MODE_SCULPT) || ccgDM_use_grid_pbvh(ccgdm)); + bool grid_pbvh = ccgDM_use_grid_pbvh(ccgdm); + if ((ob->mode & OB_MODE_SCULPT) == 0) { + /* In vwpaint, we may use a grid_pbvh for multires/subsurf, under certain conditions. + * More complex cases break 'history' trail back to original vertices, in that case we fall back to + * deformed cage only (i.e. original deformed mesh). */ + VirtualModifierData virtualModifierData; + ModifierData *md = modifiers_getVirtualModifierList(ob, &virtualModifierData); + + grid_pbvh = true; + bool has_one_ccg_modifier = false; + for (; md; md = md->next) { + /* We can only accept to use this ccgdm if: + * - it's the only active ccgdm in the stack. + * - there is no topology-modifying modifier in the stack. + * Otherwise, there is no way to map back to original geometry from grid-generated PBVH. + */ + const ModifierTypeInfo *mti = modifierType_getInfo(md->type); + + if (!modifier_isEnabled(NULL, md, eModifierMode_Realtime)) { + continue; + } + if (ELEM(mti->type, eModifierTypeType_OnlyDeform, eModifierTypeType_NonGeometrical)) { + continue; + } + + if (ELEM(md->type, eModifierType_Subsurf, eModifierType_Multires)) { + if (has_one_ccg_modifier) { + /* We only allow a single active ccg modifier in the stack. */ + grid_pbvh = false; + break; + } + has_one_ccg_modifier = true; + continue; + } + + /* Any other non-deforming modifier makes it impossible to use grid pbvh. */ + grid_pbvh = false; + break; + } + } if (ob->sculpt->pbvh) { + /* Note that we have to clean up exisitng pbvh instead of updating it in case it does not match current + * grid_pbvh status. */ if (grid_pbvh) { - /* pbvh's grids, gridadj and gridfaces points to data inside ccgdm - * but this can be freed on ccgdm release, this updates the pointers - * when the ccgdm gets remade, the assumption is that the topology - * does not change. */ - ccgdm_create_grids(dm); - BKE_pbvh_grids_update(ob->sculpt->pbvh, ccgdm->gridData, (void **)ccgdm->gridFaces, - ccgdm->gridFlagMats, ccgdm->gridHidden); + if (BKE_pbvh_get_ccgdm(ob->sculpt->pbvh) != NULL) { + /* pbvh's grids, gridadj and gridfaces points to data inside ccgdm + * but this can be freed on ccgdm release, this updates the pointers + * when the ccgdm gets remade, the assumption is that the topology + * does not change. */ + ccgdm_create_grids(dm); + BKE_pbvh_grids_update(ob->sculpt->pbvh, ccgdm->gridData, (void **)ccgdm->gridFaces, + ccgdm->gridFlagMats, ccgdm->gridHidden); + } + else { + BKE_pbvh_free(ob->sculpt->pbvh); + ob->sculpt->pbvh = NULL; + } + } + else if (BKE_pbvh_get_ccgdm(ob->sculpt->pbvh) != NULL) { + BKE_pbvh_free(ob->sculpt->pbvh); + ob->sculpt->pbvh = NULL; } ccgdm->pbvh = ob->sculpt->pbvh; } if (ccgdm->pbvh) { - /* For vertex paint, keep track of ccgdm */ - if (!(ob->mode & OB_MODE_SCULPT)) { + /* For grid pbvh, keep track of ccgdm */ + if (grid_pbvh) { BKE_pbvh_set_ccgdm(ccgdm->pbvh, ccgdm); } return ccgdm->pbvh; } - /* no pbvh exists yet, we need to create one. only in case of multires + /* No pbvh exists yet, we need to create one. only in case of multires * we build a pbvh over the modified mesh, in other cases the base mesh * is being sculpted, so we build a pbvh from that. */ - /* Note: vwpaint always builds a pbvh over the modified mesh. */ + /* Note: vwpaint tries to always build a pbvh over the modified mesh. */ if (grid_pbvh) { ccgdm_create_grids(dm); @@ -4517,8 +4568,8 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm) pbvh_show_mask_set(ccgdm->pbvh, ob->sculpt->show_mask); } - /* For vertex paint, keep track of ccgdm */ - if (!(ob->mode & OB_MODE_SCULPT) && ccgdm->pbvh) { + /* For grid pbvh, keep track of ccgdm. */ + if (grid_pbvh && ccgdm->pbvh) { BKE_pbvh_set_ccgdm(ccgdm->pbvh, ccgdm); } return ccgdm->pbvh; |