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BMesh: decimator, allow vgroup factor over 1

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Can be useful to apply more extreme weighting
This commit is contained in:
Campbell Barton
2015-06-05 15:26:37 +10:00
parent aca40295e8
commit ffaf271ab9
4 changed files with 32 additions and 34 deletions
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5
source/blender/bmesh/tools/bmesh_decimate.h
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@@ -27,7 +27,10 @@
* \ingroup bmesh
*/
void BM_mesh_decimate_collapse(BMesh *bm, const float factor, float *vweights, const bool do_triangulate);
void BM_mesh_decimate_collapse(
BMesh *bm, const float factor,
float *vweights, float vweight_factor,
const bool do_triangulate);
void BM_mesh_decimate_unsubdivide_ex(BMesh *bm, const int iterations, const bool tag_only);
void BM_mesh_decimate_unsubdivide(BMesh *bm, const int iterations);

49
source/blender/bmesh/tools/bmesh_decimate_collapse.c
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@@ -225,7 +225,8 @@ static float bm_decim_build_edge_cost_single__topology(BMEdge *e)
static void bm_decim_build_edge_cost_single(
BMEdge *e,
const Quadric *vquadrics, const float *vweights,
const Quadric *vquadrics,
const float *vweights, const float vweight_factor,
Heap *eheap, HeapNode **eheap_table)
{
const Quadric *q1, *q2;
@@ -270,17 +271,10 @@ static void bm_decim_build_edge_cost_single(
BLI_quadric_evaluate(q2, optimize_co));
// print("COST %.12f\n");
/* note, 'cost' shouldn't be negative but happens sometimes with small values.
* this can cause faces that make up a flat surface to over-collapse, see [#37121] */
cost = fabsf(cost);
/* edge weights can be 2 max, ((2 * 2) ^ 2) == 16x max,
* a high weight means being inserted into the heap ahead of 16x better edges.
* but thats fine since its the purpose of weighting. */
#define VWEIGHT_SCALE 2
#ifdef USE_TOPOLOGY_FALLBACK
if (UNLIKELY(cost < TOPOLOGY_FALLBACK_EPS)) {
/* subtract existing cost to further differentiate edges from one another
@@ -293,14 +287,13 @@ static void bm_decim_build_edge_cost_single(
}
else {
/* with weights we need to use the real length so we can scale them properly */
float e_weight = (vweights[BM_elem_index_get(e->v1)] +
vweights[BM_elem_index_get(e->v2)]);
const float e_weight = (vweights[BM_elem_index_get(e->v1)] +
vweights[BM_elem_index_get(e->v2)]);
cost = bm_decim_build_edge_cost_single__topology(e) - cost;
/* note, this is rather arbitrary max weight is 2 here,
* allow for skipping edges 4x the length, based on weights */
if (e_weight) {
e_weight *= VWEIGHT_SCALE;
cost *= 1.0f + SQUARE(e_weight);
cost *= 1.0f + (e_weight * vweight_factor);
}
BLI_assert(cost <= 0.0f);
@@ -309,14 +302,12 @@ static void bm_decim_build_edge_cost_single(
else
#endif
if (vweights) {
float e_weight = 2.0f - (vweights[BM_elem_index_get(e->v1)] +
vweights[BM_elem_index_get(e->v2)]);
const float e_weight = 2.0f - (vweights[BM_elem_index_get(e->v1)] +
vweights[BM_elem_index_get(e->v2)]);
if (e_weight) {
e_weight *= VWEIGHT_SCALE;
cost += (BM_edge_calc_length(e) * SQUARE(e_weight));
cost += (BM_edge_calc_length(e) * ((e_weight * vweight_factor)));
}
}
#undef VWEIGHT_SCALE
eheap_table[BM_elem_index_get(e)] = BLI_heap_insert(eheap, cost, e);
return;
@@ -338,7 +329,8 @@ static void bm_decim_invalid_edge_cost_single(
static void bm_decim_build_edge_cost(
BMesh *bm,
const Quadric *vquadrics, const float *vweights,
const Quadric *vquadrics,
const float *vweights, const float vweight_factor,
Heap *eheap, HeapNode **eheap_table)
{
BMIter iter;
@@ -347,7 +339,7 @@ static void bm_decim_build_edge_cost(
BM_ITER_MESH_INDEX (e, &iter, bm, BM_EDGES_OF_MESH, i) {
eheap_table[i] = NULL; /* keep sanity check happy */
bm_decim_build_edge_cost_single(e, vquadrics, vweights, eheap, eheap_table);
bm_decim_build_edge_cost_single(e, vquadrics, vweights, vweight_factor, eheap, eheap_table);
}
}
@@ -921,7 +913,8 @@ static bool bm_edge_collapse(
/* collapse e the edge, removing e->v2 */
static void bm_decim_edge_collapse(
BMesh *bm, BMEdge *e,
Quadric *vquadrics, float *vweights,
Quadric *vquadrics,
float *vweights, const float vweight_factor,
Heap *eheap, HeapNode **eheap_table,
const CD_UseFlag customdata_flag)
{
@@ -1011,7 +1004,7 @@ static void bm_decim_edge_collapse(
e_iter = e_first = v_other->e;
do {
BLI_assert(BM_edge_find_double(e_iter) == NULL);
bm_decim_build_edge_cost_single(e_iter, vquadrics, vweights, eheap, eheap_table);
bm_decim_build_edge_cost_single(e_iter, vquadrics, vweights, vweight_factor, eheap, eheap_table);
} while ((e_iter = bmesh_disk_edge_next(e_iter, v_other)) != e_first);
}
@@ -1033,7 +1026,7 @@ static void bm_decim_edge_collapse(
BLI_assert(BM_vert_in_edge(e_outer, l->v) == false);
bm_decim_build_edge_cost_single(e_outer, vquadrics, vweights, eheap, eheap_table);
bm_decim_build_edge_cost_single(e_outer, vquadrics, vweights, vweight_factor, eheap, eheap_table);
}
}
}
@@ -1057,7 +1050,11 @@ static void bm_decim_edge_collapse(
* \param vweights Optional array of vertex aligned weights [0 - 1],
* a vertex group is the usual source for this.
*/
void BM_mesh_decimate_collapse(BMesh *bm, const float factor, float *vweights, const bool do_triangulate)
void BM_mesh_decimate_collapse(
BMesh *bm,
const float factor,
float *vweights, float vweight_factor,
const bool do_triangulate)
{
Heap *eheap; /* edge heap */
HeapNode **eheap_table; /* edge index aligned table pointing to the eheap */
@@ -1085,7 +1082,7 @@ void BM_mesh_decimate_collapse(BMesh *bm, const float factor, float *vweights, c
/* build initial edge collapse cost data */
bm_decim_build_quadrics(bm, vquadrics);
bm_decim_build_edge_cost(bm, vquadrics, vweights, eheap, eheap_table);
bm_decim_build_edge_cost(bm, vquadrics, vweights, vweight_factor, eheap, eheap_table);
face_tot_target = bm->totface * factor;
bm->elem_index_dirty |= BM_ALL;
@@ -1107,13 +1104,11 @@ void BM_mesh_decimate_collapse(BMesh *bm, const float factor, float *vweights, c
BMEdge *e = BLI_heap_popmin(eheap);
BLI_assert(BM_elem_index_get(e) < tot_edge_orig); /* handy to detect corruptions elsewhere */
// printf("COST %.10f\n", value);
/* under normal conditions wont be accessed again,
* but NULL just incase so we don't use freed node */
eheap_table[BM_elem_index_get(e)] = NULL;
bm_decim_edge_collapse(bm, e, vquadrics, vweights, eheap, eheap_table, customdata_flag);
bm_decim_edge_collapse(bm, e, vquadrics, vweights, vweight_factor, eheap, eheap_table, customdata_flag);
}

6
source/blender/makesrna/intern/rna_modifier.c
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@@ -1507,10 +1507,10 @@ static void rna_def_modifier_decimate(BlenderRNA *brna)
RNA_def_property_ui_text(prop, "Triangulate", "Keep triangulated faces resulting from decimation (collapse only)");
RNA_def_property_update(prop, 0, "rna_Modifier_update");
prop = RNA_def_property(srna, "vertex_group_factor", PROP_FLOAT, PROP_FACTOR);
prop = RNA_def_property(srna, "vertex_group_factor", PROP_FLOAT, PROP_NONE);
RNA_def_property_float_sdna(prop, NULL, "defgrp_factor");
RNA_def_property_range(prop, 0, 1.0f);
RNA_def_property_ui_range(prop, 0, 1, 1, 4);
RNA_def_property_range(prop, 0, 1000);
RNA_def_property_ui_range(prop, 0, 10, 1, 4);
RNA_def_property_ui_text(prop, "Factor", "Vertex group strength");
RNA_def_property_update(prop, 0, "rna_Modifier_update");
/* end collapse-only option */

6
source/blender/modifiers/intern/MOD_decimate.c
View File

@@ -147,12 +147,12 @@ static DerivedMesh *applyModifier(ModifierData *md, Object *ob,
if (dmd->flag & MOD_DECIM_FLAG_INVERT_VGROUP) {
for (i = 0; i < vert_tot; i++) {
vweights[i] = (1.0f - defvert_find_weight(&dvert[i], defgrp_index)) * dmd->defgrp_factor;
vweights[i] = 1.0f - defvert_find_weight(&dvert[i], defgrp_index);
}
}
else {
for (i = 0; i < vert_tot; i++) {
vweights[i] = (defvert_find_weight(&dvert[i], defgrp_index)) * dmd->defgrp_factor;
vweights[i] = defvert_find_weight(&dvert[i], defgrp_index);
}
}
}
@@ -165,7 +165,7 @@ static DerivedMesh *applyModifier(ModifierData *md, Object *ob,
case MOD_DECIM_MODE_COLLAPSE:
{
const bool do_triangulate = (dmd->flag & MOD_DECIM_FLAG_TRIANGULATE) != 0;
BM_mesh_decimate_collapse(bm, dmd->percent, vweights, do_triangulate);
BM_mesh_decimate_collapse(bm, dmd->percent, vweights, dmd->defgrp_factor, do_triangulate);
break;
}
case MOD_DECIM_MODE_UNSUBDIV: