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path: root/source/blender/blenlib/intern/mesh_intersect.cc
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Diffstat (limited to 'source/blender/blenlib/intern/mesh_intersect.cc')
-rw-r--r--source/blender/blenlib/intern/mesh_intersect.cc91
1 files changed, 64 insertions, 27 deletions
diff --git a/source/blender/blenlib/intern/mesh_intersect.cc b/source/blender/blenlib/intern/mesh_intersect.cc
index 636209883c3..97f856476c5 100644
--- a/source/blender/blenlib/intern/mesh_intersect.cc
+++ b/source/blender/blenlib/intern/mesh_intersect.cc
@@ -1165,13 +1165,19 @@ static int filter_plane_side(const double3 &p,
* Assumes ab is not perpendicular to n.
* This works because the ratio of the projections of ab and ac onto n is the same as
* the ratio along the line ab of the intersection point to the whole of ab.
+ * The ab, ac, and dotbuf arguments are used as a temporaries; declaring them
+ * in the caller can avoid many allocs and frees of mpq3 and mpq_class structures.
*/
-static inline mpq3 tti_interp(const mpq3 &a, const mpq3 &b, const mpq3 &c, const mpq3 &n)
-{
- mpq3 ab = a - b;
- mpq_class den = mpq3::dot(ab, n);
+static inline mpq3 tti_interp(
+ const mpq3 &a, const mpq3 &b, const mpq3 &c, const mpq3 &n, mpq3 &ab, mpq3 &ac, mpq3 &dotbuf)
+{
+ ab = a;
+ ab -= b;
+ ac = a;
+ ac -= c;
+ mpq_class den = mpq3::dot_with_buffer(ab, n, dotbuf);
BLI_assert(den != 0);
- mpq_class alpha = mpq3::dot(a - c, n) / den;
+ mpq_class alpha = mpq3::dot_with_buffer(ac, n, dotbuf) / den;
return a - alpha * ab;
}
@@ -1179,11 +1185,28 @@ static inline mpq3 tti_interp(const mpq3 &a, const mpq3 &b, const mpq3 &c, const
* Return +1, 0, -1 as a + ad is above, on, or below the oriented plane containing a, b, c in CCW
* order. This is the same as -oriented(a, b, c, a + ad), but uses fewer arithmetic operations.
* TODO: change arguments to `const Vert *` and use floating filters.
+ * The ba, ca, n, and dotbuf arguments are used as temporaries; declaring them
+ * in the caller can avoid many allocs and frees of mpq3 and mpq_class structures.
*/
-static inline int tti_above(const mpq3 &a, const mpq3 &b, const mpq3 &c, const mpq3 &ad)
+static inline int tti_above(const mpq3 &a,
+ const mpq3 &b,
+ const mpq3 &c,
+ const mpq3 &ad,
+ mpq3 &ba,
+ mpq3 &ca,
+ mpq3 &n,
+ mpq3 &dotbuf)
{
- mpq3 n = mpq3::cross(b - a, c - a);
- return sgn(mpq3::dot(ad, n));
+ ba = b;
+ ba -= a;
+ ca = c;
+ ca -= a;
+
+ n.x = ba.y * ca.z - ba.z * ca.y;
+ n.y = ba.z * ca.x - ba.x * ca.z;
+ n.z = ba.x * ca.y - ba.y * ca.x;
+
+ return sgn(mpq3::dot_with_buffer(ad, n, dotbuf));
}
/**
@@ -1227,20 +1250,21 @@ static ITT_value itt_canon2(const mpq3 &p1,
mpq3 p1p2 = p2 - p1;
mpq3 intersect_1;
mpq3 intersect_2;
+ mpq3 buf[4];
bool no_overlap = false;
/* Top test in classification tree. */
- if (tti_above(p1, q1, r2, p1p2) > 0) {
+ if (tti_above(p1, q1, r2, p1p2, buf[0], buf[1], buf[2], buf[3]) > 0) {
/* Middle right test in classification tree. */
- if (tti_above(p1, r1, r2, p1p2) <= 0) {
+ if (tti_above(p1, r1, r2, p1p2, buf[0], buf[1], buf[2], buf[3]) <= 0) {
/* Bottom right test in classification tree. */
- if (tti_above(p1, r1, q2, p1p2) > 0) {
+ if (tti_above(p1, r1, q2, p1p2, buf[0], buf[1], buf[2], buf[3]) > 0) {
/* Overlap is [k [i l] j]. */
if (dbg_level > 0) {
std::cout << "overlap [k [i l] j]\n";
}
/* i is intersect with p1r1. l is intersect with p2r2. */
- intersect_1 = tti_interp(p1, r1, p2, n2);
- intersect_2 = tti_interp(p2, r2, p1, n1);
+ intersect_1 = tti_interp(p1, r1, p2, n2, buf[0], buf[1], buf[2]);
+ intersect_2 = tti_interp(p2, r2, p1, n1, buf[0], buf[1], buf[2]);
}
else {
/* Overlap is [i [k l] j]. */
@@ -1248,8 +1272,8 @@ static ITT_value itt_canon2(const mpq3 &p1,
std::cout << "overlap [i [k l] j]\n";
}
/* k is intersect with p2q2. l is intersect is p2r2. */
- intersect_1 = tti_interp(p2, q2, p1, n1);
- intersect_2 = tti_interp(p2, r2, p1, n1);
+ intersect_1 = tti_interp(p2, q2, p1, n1, buf[0], buf[1], buf[2]);
+ intersect_2 = tti_interp(p2, r2, p1, n1, buf[0], buf[1], buf[2]);
}
}
else {
@@ -1262,7 +1286,7 @@ static ITT_value itt_canon2(const mpq3 &p1,
}
else {
/* Middle left test in classification tree. */
- if (tti_above(p1, q1, q2, p1p2) < 0) {
+ if (tti_above(p1, q1, q2, p1p2, buf[0], buf[1], buf[2], buf[3]) < 0) {
/* No overlap: [i j] [k l]. */
if (dbg_level > 0) {
std::cout << "no overlap: [i j] [k l]\n";
@@ -1271,14 +1295,14 @@ static ITT_value itt_canon2(const mpq3 &p1,
}
else {
/* Bottom left test in classification tree. */
- if (tti_above(p1, r1, q2, p1p2) >= 0) {
+ if (tti_above(p1, r1, q2, p1p2, buf[0], buf[1], buf[2], buf[3]) >= 0) {
/* Overlap is [k [i j] l]. */
if (dbg_level > 0) {
std::cout << "overlap [k [i j] l]\n";
}
/* i is intersect with p1r1. j is intersect with p1q1. */
- intersect_1 = tti_interp(p1, r1, p2, n2);
- intersect_2 = tti_interp(p1, q1, p2, n2);
+ intersect_1 = tti_interp(p1, r1, p2, n2, buf[0], buf[1], buf[2]);
+ intersect_2 = tti_interp(p1, q1, p2, n2, buf[0], buf[1], buf[2]);
}
else {
/* Overlap is [i [k j] l]. */
@@ -1286,8 +1310,8 @@ static ITT_value itt_canon2(const mpq3 &p1,
std::cout << "overlap [i [k j] l]\n";
}
/* k is intersect with p2q2. j is intersect with p1q1. */
- intersect_1 = tti_interp(p2, q2, p1, n1);
- intersect_2 = tti_interp(p1, q1, p2, n2);
+ intersect_1 = tti_interp(p2, q2, p1, n1, buf[0], buf[1], buf[2]);
+ intersect_2 = tti_interp(p1, q1, p2, n2, buf[0], buf[1], buf[2]);
}
}
}
@@ -1438,6 +1462,7 @@ static ITT_value intersect_tri_tri(const IMesh &tm, int t1, int t2)
return ITT_value(INONE);
}
+ mpq3 buf[2];
const mpq3 &p1 = vp1->co_exact;
const mpq3 &q1 = vq1->co_exact;
const mpq3 &r1 = vr1->co_exact;
@@ -1447,13 +1472,19 @@ static ITT_value intersect_tri_tri(const IMesh &tm, int t1, int t2)
const mpq3 &n2 = tri2.plane->norm_exact;
if (sp1 == 0) {
- sp1 = sgn(mpq3::dot(p1 - r2, n2));
+ buf[0] = p1;
+ buf[0] -= r2;
+ sp1 = sgn(mpq3::dot_with_buffer(buf[0], n2, buf[1]));
}
if (sq1 == 0) {
- sq1 = sgn(mpq3::dot(q1 - r2, n2));
+ buf[0] = q1;
+ buf[0] -= r2;
+ sq1 = sgn(mpq3::dot_with_buffer(buf[0], n2, buf[1]));
}
if (sr1 == 0) {
- sr1 = sgn(mpq3::dot(r1 - r2, n2));
+ buf[0] = r1;
+ buf[0] -= r2;
+ sr1 = sgn(mpq3::dot_with_buffer(buf[0], n2, buf[1]));
}
if (dbg_level > 1) {
@@ -1473,13 +1504,19 @@ static ITT_value intersect_tri_tri(const IMesh &tm, int t1, int t2)
/* Repeat for signs of t2's vertices with respect to plane of t1. */
const mpq3 &n1 = tri1.plane->norm_exact;
if (sp2 == 0) {
- sp2 = sgn(mpq3::dot(p2 - r1, n1));
+ buf[0] = p2;
+ buf[0] -= r1;
+ sp2 = sgn(mpq3::dot_with_buffer(buf[0], n1, buf[1]));
}
if (sq2 == 0) {
- sq2 = sgn(mpq3::dot(q2 - r1, n1));
+ buf[0] = q2;
+ buf[0] -= r1;
+ sq2 = sgn(mpq3::dot_with_buffer(buf[0], n1, buf[1]));
}
if (sr2 == 0) {
- sr2 = sgn(mpq3::dot(r2 - r1, n1));
+ buf[0] = r2;
+ buf[0] -= r1;
+ sr2 = sgn(mpq3::dot_with_buffer(buf[0], n1, buf[1]));
}
if (dbg_level > 1) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-15 16:12:16 +0300