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AdMesh:

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unify positive and negative zeros in stl_check_facets_exact() and stl_check_facets_nearby()
New function stl_transform() by a 3x4 matrix.
Some constness improvements.
This commit is contained in:
bubnikv
2017-02-26 21:59:09 +01:00
parent b7aeeb968b
commit efb02f71f0
4 changed files with 43 additions and 27 deletions
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xs/src/admesh/connect.c
+20
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@@ -82,6 +82,16 @@ stl_check_facets_exact(stl_file *stl) {
for(i = 0; i < stl->stats.number_of_facets; i++) {
facet = stl->facet_start[i];
// Positive and negative zeros are possible in the floats, which are considered equal by the FP unit.
// When using a memcmp on raw floats, those numbers report to be different.
// Unify all +0 and -0 to +0 to make the floats equal under memcmp.
{
uint32_t *f = (uint32_t*)&facet;
for (int j = 0; j < 12; ++ j, ++ f) // 3x vertex + normal: 4x3 = 12 floats
if (*f == 0x80000000)
// Negative zero, switch to positive zero.
*f = 0;
}
/* If any two of the three vertices are found to be exactally the same, call them degenerate and remove the facet. */
if( !memcmp(&facet.vertex[0], &facet.vertex[1],
@@ -278,6 +288,16 @@ stl_check_facets_nearby(stl_file *stl, float tolerance) {
for(i = 0; i < stl->stats.number_of_facets; i++) {
facet = stl->facet_start[i];
// Positive and negative zeros are possible in the floats, which are considered equal by the FP unit.
// When using a memcmp on raw floats, those numbers report to be different.
// Unify all +0 and -0 to +0 to make the floats equal under memcmp.
{
uint32_t *f = (uint32_t*)&facet;
for (int j = 0; j < 12; ++ j, ++ f) // 3x vertex + normal: 4x3 = 12 floats
if (*f == 0x80000000)
// Negative zero, switch to positive zero.
*f = 0;
}
for(j = 0; j < 3; j++) {
if(stl->neighbors_start[i].neighbor[j] == -1) {
edge[j].facet_number = i;