Commit: 5ea27bec1fc1e65ce85cccd3079883a41970cd6c
Author: Campbell Barton
Date: Tue Jun 14 16:47:05 2016 +1000
Branches: master
https://developer.blender.org/rB5ea27bec1fc1e65ce85cccd3079883a41970cd6c
BMesh Decimate: use doubles to calculate optimized position
This allows the error threshold for calculating the optimized location to be
much lower.
Resolves visible artifacts w/ 1m-tri happy-buddha example.
===================================================================
M source/blender/blenlib/BLI_quadric.h
M source/blender/blenlib/intern/quadric.c
M source/blender/bmesh/tools/bmesh_decimate_collapse.c
===================================================================
diff --git a/source/blender/blenlib/BLI_quadric.h
b/source/blender/blenlib/BLI_quadric.h
index eaf9c7a..d46a221 100644
--- a/source/blender/blenlib/BLI_quadric.h
+++ b/source/blender/blenlib/BLI_quadric.h
@@ -39,8 +39,7 @@ typedef struct Quadric {
/* conversion */
void BLI_quadric_from_plane(Quadric *q, const double v[4]);
-void BLI_quadric_to_tensor_m3(const Quadric *q, float m[3][3]);
-void BLI_quadric_to_vector_v3(const Quadric *q, float v[3]);
+void BLI_quadric_to_vector_v3(const Quadric *q, double v[3]);
void BLI_quadric_clear(Quadric *q);
@@ -50,7 +49,7 @@ void BLI_quadric_add_qu_ququ(Quadric *r, const Quadric *a,
const Quadric *b);
void BLI_quadric_mul(Quadric *a, const double scalar);
/* solve */
-double BLI_quadric_evaluate(const Quadric *q, const float v_fl[3]);
-bool BLI_quadric_optimize(const Quadric *q, float v[3], const float epsilon);
+double BLI_quadric_evaluate(const Quadric *q, const double v[3]);
+bool BLI_quadric_optimize(const Quadric *q, double v[3], const double
epsilon);
#endif /* __BLI_QUADRIC_H__ */
diff --git a/source/blender/blenlib/intern/quadric.c
b/source/blender/blenlib/intern/quadric.c
index 588cd9c..c9d2749 100644
--- a/source/blender/blenlib/intern/quadric.c
+++ b/source/blender/blenlib/intern/quadric.c
@@ -63,26 +63,68 @@ void BLI_quadric_from_plane(Quadric *q, const double v[4])
q->d2 = v[3] * v[3];
}
-void BLI_quadric_to_tensor_m3(const Quadric *q, float m[3][3])
+#if 0 /* UNUSED */
+
+static void quadric_to_tensor_m3(const Quadric *q, double m[3][3])
{
- m[0][0] = (float)q->a2;
- m[0][1] = (float)q->ab;
- m[0][2] = (float)q->ac;
+ m[0][0] = q->a2;
+ m[0][1] = q->ab;
+ m[0][2] = q->ac;
- m[1][0] = (float)q->ab;
- m[1][1] = (float)q->b2;
- m[1][2] = (float)q->bc;
+ m[1][0] = q->ab;
+ m[1][1] = q->b2;
+ m[1][2] = q->bc;
- m[2][0] = (float)q->ac;
- m[2][1] = (float)q->bc;
- m[2][2] = (float)q->c2;
+ m[2][0] = q->ac;
+ m[2][1] = q->bc;
+ m[2][2] = q->c2;
}
-void BLI_quadric_to_vector_v3(const Quadric *q, float v[3])
+#endif
+
+/**
+ * Inline inverse matrix creation.
+ * Equivalent of:
+ *
+ * \code{.c}
+ * quadric_to_tensor_m3(q, m);
+ * invert_m3_db(m, eps);
+ * \endcode
+ */
+static bool quadric_to_tensor_m3_inverse(const Quadric *q, double m[3][3],
double epsilon)
{
- v[0] = (float)q->ad;
- v[1] = (float)q->bd;
- v[2] = (float)q->cd;
+ const double det =
+ (q->a2 * (q->b2 * q->c2 - q->bc * q->bc) -
+ q->ab * (q->ab * q->c2 - q->ac * q->bc) +
+ q->ac * (q->ab * q->bc - q->ac * q->b2));
+
+ if (fabs(det) > epsilon) {
+ const double invdet = 1.0 / det;
+
+ m[0][0] = (q->b2 * q->c2 - q->bc * q->bc) * invdet;
+ m[1][0] = (q->bc * q->ac - q->ab * q->c2) * invdet;
+ m[2][0] = (q->ab * q->bc - q->b2 * q->ac) * invdet;
+
+ m[0][1] = (q->ac * q->bc - q->ab * q->c2) * invdet;
+ m[1][1] = (q->a2 * q->c2 - q->ac * q->ac) * invdet;
+ m[2][1] = (q->ab * q->ac - q->a2 * q->bc) * invdet;
+
+ m[0][2] = (q->ab * q->bc - q->ac * q->b2) * invdet;
+ m[1][2] = (q->ac * q->ab - q->a2 * q->bc) * invdet;
+ m[2][2] = (q->a2 * q->b2 - q->ab * q->ab) * invdet;
+
+ return true;
+ }
+ else {
+ return false;
+ }
+}
+
+void BLI_quadric_to_vector_v3(const Quadric *q, double v[3])
+{
+ v[0] = q->ad;
+ v[1] = q->bd;
+ v[2] = q->cd;
}
void BLI_quadric_clear(Quadric *q)
@@ -105,26 +147,22 @@ void BLI_quadric_mul(Quadric *a, const double scalar)
mul_vn_db((double *)a, QUADRIC_FLT_TOT, scalar);
}
-double BLI_quadric_evaluate(const Quadric *q, const float v_fl[3])
+double BLI_quadric_evaluate(const Quadric *q, const double v[3])
{
- const double v[3] = {UNPACK3(v_fl)};
return ((q->a2 * v[0] * v[0]) + (q->ab * 2 * v[0] * v[1]) + (q->ac * 2
* v[0] * v[2]) + (q->ad * 2 * v[0]) +
(q->b2 * v[1] * v[1]) + (q->bc * 2 * v[1] * v[2]) + (q->bd * 2
* v[1]) +
(q->c2 * v[2] * v[2]) + (q->cd * 2 * v[2]) +
(q->d2));
}
-bool BLI_quadric_optimize(const Quadric *q, float v[3], const float epsilon)
+bool BLI_quadric_optimize(const Quadric *q, double v[3], const double epsilon)
{
- float m[3][3];
+ double m[3][3];
- BLI_quadric_to_tensor_m3(q, m);
-
- if (invert_m3_ex(m, epsilon)) {
+ if (quadric_to_tensor_m3_inverse(q, m, epsilon)) {
BLI_quadric_to_vector_v3(q, v);
- mul_m3_v3(m, v);
- negate_v3(v);
-
+ mul_m3_v3_db(m, v);
+ negate_v3_db(v);
return true;
}
else {
diff --git a/source/blender/bmesh/tools/bmesh_decimate_collapse.c
b/source/blender/bmesh/tools/bmesh_decimate_collapse.c
index fe8b132..3ea7dae 100644
--- a/source/blender/bmesh/tools/bmesh_decimate_collapse.c
+++ b/source/blender/bmesh/tools/bmesh_decimate_collapse.c
@@ -68,7 +68,9 @@
#endif
#define BOUNDARY_PRESERVE_WEIGHT 100.0f
-#define OPTIMIZE_EPS 0.01f /* FLT_EPSILON is too small, see [#33106] */
+/* Uses double precision, impacts behavior on near-flat surfaces,
+ * cane give issues with very small faces. 1e-2 is too big, see: T48154. */
+#define OPTIMIZE_EPS 1e-8
#define COST_INVALID FLT_MAX
typedef enum CD_UseFlag {
@@ -140,8 +142,8 @@ static void bm_decim_build_quadrics(BMesh *bm, Quadric
*vquadrics)
}
-static void bm_decim_calc_target_co(
- BMEdge *e, float optimize_co[3],
+static void bm_decim_calc_target_co_db(
+ BMEdge *e, double optimize_co[3],
const Quadric *vquadrics)
{
/* compute an edge contraction target for edge 'e'
@@ -158,10 +160,22 @@ static void bm_decim_calc_target_co(
return; /* all is good */
}
else {
- mid_v3_v3v3(optimize_co, e->v1->co, e->v2->co);
+ optimize_co[0] = 0.5 * ((double)e->v1->co[0] +
(double)e->v2->co[0]);
+ optimize_co[1] = 0.5 * ((double)e->v1->co[1] +
(double)e->v2->co[1]);
+ optimize_co[2] = 0.5 * ((double)e->v1->co[2] +
(double)e->v2->co[2]);
}
}
+static void bm_decim_calc_target_co_fl(
+ BMEdge *e, float optimize_co[3],
+ const Quadric *vquadrics)
+{
+ double optimize_co_db[3];
+ bm_decim_calc_target_co_db(e, optimize_co_db, vquadrics);
+ copy_v3fl_v3db(optimize_co, optimize_co_db);
+}
+
+
static bool bm_edge_collapse_is_degenerate_flip(BMEdge *e, const float
optimize_co[3])
{
BMIter liter;
@@ -240,8 +254,6 @@ static void bm_decim_build_edge_cost_single(
const float *vweights, const float vweight_factor,
Heap *eheap, HeapNode **eheap_table)
{
- const Quadric *q1, *q2;
- float optimize_co[3];
float cost;
if (eheap_table[BM_elem_index_get(e)]) {
@@ -279,15 +291,17 @@ static void bm_decim_build_edge_cost_single(
}
/* end sanity check */
+ {
+ double optimize_co[3];
+ bm_decim_calc_target_co_db(e, optimize_co, vquadrics);
- bm_decim_calc_target_co(e, optimize_co, vquadrics);
-
- q1 = &vquadrics[BM_elem_index_get(e->v1)];
- q2 = &vquadrics[BM_elem_index_get(e->v2)];
-
- cost = (BLI_quadric_evaluate(q1, optimize_co) +
- BLI_quadric_evaluate(q2, optimize_co));
+ const Quadric *q1, *q2;
+ q1 = &vquadrics[BM_elem_index_get(e->v1)];
+ q2 = &vquadrics[BM_elem_index_get(e->v2)];
+ cost = (BLI_quadric_evaluate(q1, optimize_co) +
+ BLI_quadric_evaluate(q2, optimize_co));
+ }
/* 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] */
@@ -1155,7 +1169,7 @@ static bool bm_decim_edge_collapse(
return false;
}
- bm_decim_calc_target_co(e, optimize_co, vquadrics);
+ bm_decim_calc_target_co_fl(e, optimize_co, vquadrics);
/* check if this would result in an overlapping face */
if (UNLIKELY(bm_edge_collapse_is_degenerate_flip(e,
optimize_co))) {
@@ -1426,7 +1440,7 @@ void BM_mesh_decimate_collapse(
goto invalidate;
}
- bm_decim_calc_target_co(e, optimize_co,
vquadrics);
+ bm_decim_calc_target_co_fl(e, optimize_co,
vquadrics);
if (e_index_mirr == e_index) {
optimize_co[symmetry_axis] = 0.0f;
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