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Fixed a regression bug in admesh: bad hashing.

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Also the hash table size for admesh was made adaptive based on the number
of faces.
This commit is contained in:
bubnikv 2018-09-25 16:05:26 +02:00
parent 6260e43f61
commit 47b2d363f0
3 changed files with 30 additions and 16 deletions
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34
src/admesh/connect.cpp
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@ -25,6 +25,9 @@
#include <string.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <boost/detail/endian.hpp>
#include "stl.h"
@ -125,11 +128,11 @@ stl_load_edge_exact(stl_file *stl, stl_hash_edge *edge,
std::swap(a, b);
edge->which_edge += 3; /* this edge is loaded backwards */
}
memcpy(&edge->key[0], a->data(), sizeof(stl_vertex));
memcpy(&edge->key[sizeof(stl_vertex)], b->data(), sizeof(stl_vertex));
memcpy(&edge->key[0], a->data(), sizeof(stl_vertex));
memcpy(&edge->key[3], b->data(), sizeof(stl_vertex));
// Switch negative zeros to positive zeros, so memcmp will consider them to be equal.
for (size_t i = 0; i < 6; ++ i) {
unsigned char *p = edge->key + i * 4;
unsigned char *p = (unsigned char*)(edge->key + i);
#ifdef BOOST_LITTLE_ENDIAN
if (p[0] == 0 && p[1] == 0 && p[2] == 0 && p[3] == 0x80)
// Negative zero, switch to positive zero.
@ -142,6 +145,16 @@ stl_load_edge_exact(stl_file *stl, stl_hash_edge *edge,
}
}
static inline size_t hash_size_from_nr_faces(const size_t nr_faces)
{
// Good primes for addressing a cca. 30 bit space.
// https://planetmath.org/goodhashtableprimes
static std::vector<uint32_t> primes{ 98317, 196613, 393241, 786433, 1572869, 3145739, 6291469, 12582917, 25165843, 50331653, 100663319, 201326611, 402653189, 805306457, 1610612741 };
// Find a prime number for 50% filling of the shared triangle edges in the mesh.
auto it = std::upper_bound(primes.begin(), primes.end(), nr_faces * 3 * 2 - 1);
return (it == primes.end()) ? primes.back() : *it;
}
static void
stl_initialize_facet_check_exact(stl_file *stl) {
int i;
@ -152,10 +165,9 @@ stl_initialize_facet_check_exact(stl_file *stl) {
stl->stats.freed = 0;
stl->stats.collisions = 0;
stl->M = hash_size_from_nr_faces(stl->stats.number_of_facets);
stl->M = 81397;
for(i = 0; i < stl->stats.number_of_facets ; i++) {
for (i = 0; i < stl->stats.number_of_facets ; i++) {
/* initialize neighbors list to -1 to mark unconnected edges */
stl->neighbors_start[i].neighbor[0] = -1;
stl->neighbors_start[i].neighbor[1] = -1;
@ -296,11 +308,11 @@ static int stl_load_edge_nearby(stl_file *stl, stl_hash_edge *edge, stl_vertex *
((vertex1[1] != vertex2[1]) ?
(vertex1[1] < vertex2[1]) :
(vertex1[2] < vertex2[2]))) {
memcpy(&edge->key[0], vertex1.data(), sizeof(stl_vertex));
memcpy(&edge->key[sizeof(stl_vertex)], vertex2.data(), sizeof(stl_vertex));
memcpy(&edge->key[0], vertex1.data(), sizeof(stl_vertex));
memcpy(&edge->key[3], vertex2.data(), sizeof(stl_vertex));
} else {
memcpy(&edge->key[0], vertex2.data(), sizeof(stl_vertex));
memcpy(&edge->key[sizeof(stl_vertex)], vertex1.data(), sizeof(stl_vertex));
memcpy(&edge->key[0], vertex2.data(), sizeof(stl_vertex));
memcpy(&edge->key[3], vertex1.data(), sizeof(stl_vertex));
edge->which_edge += 3; /* this edge is loaded backwards */
}
return 1;
@ -338,7 +350,7 @@ static void stl_initialize_facet_check_nearby(stl_file *stl)
/* tolerance = STL_MAX((stl->stats.bounding_diameter / 500000.0), tolerance);*/
/* tolerance *= 0.5;*/
stl->M = 81397;
stl->M = hash_size_from_nr_faces(stl->stats.number_of_facets);
stl->heads = (stl_hash_edge**)calloc(stl->M, sizeof(*stl->heads));
if(stl->heads == NULL) perror("stl_initialize_facet_check_nearby");