manolas
/
vcglib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

added function for laplacian smoothing of normals on unstructured point clouds

This commit is contained in:
Marco Callieri 2011-02-09 14:42:30 +00:00
parent 4107c587d0
commit 6395138b1f
1 changed files with 66 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
vcg/space/normal_extrapolation.h
View File

@ -347,6 +347,72 @@ namespace vcg
}
if (callback!=NULL) (callback)(100, message);
};
static void SmoothNormalsUsingNeighbors(const VertexIterator &begin, const VertexIterator &end, const unsigned int k, bool usedistance, CallBackPos *callback=NULL)
{
BoundingBoxType dataset_bb;
for (VertexIterator iter=begin; iter!=end; iter++)
dataset_bb.Add(iter->P());
ScalarType max_distance = dataset_bb.Diag();
// Step 1: identify the tangent planes used to locally approximate the surface
int vertex_count = int( std::distance(begin, end) );
int step = int(vertex_count/100)-1;
int progress = 0;
int percentage;
char message[128];
sprintf(message, "Locating neighbors...");
vcg::Octree< VertexType, ScalarType > octree_for_neighbors;
octree_for_neighbors.Set( begin, end );
std::vector< NormalType > new_normals(vertex_count);
std::vector< VertexPointer > nearest_vertices;
std::vector< CoordType > nearest_points;
std::vector< ScalarType > distances;
for (VertexIterator iter=begin; iter!=end; iter++)
{
if (callback!=NULL && (++progress%step)==0 && (percentage=int((progress*100)/vertex_count))<100) (callback)(percentage, message);
VertPointDistanceFunctor vpdf;
DummyObjectMarker dom;
octree_for_neighbors.GetKClosest(vpdf, dom, k, iter->P(), max_distance, nearest_vertices, distances, nearest_points);
// for each vertex *iter, compute the normal as avarege of the k-nearest vertices of *iter
NormalType normal_accum(0.0, 0.0, 0.0);
ScalarType dist_max = -100.0;
if(usedistance)
for (unsigned int n=0; n<k; n++)
{
if (distances[n] > dist_max)
dist_max = distances[n];
}
for (unsigned int n=0; n<k; n++)
{
if(usedistance)
normal_accum += (nearest_vertices[n]->N() * distances[n]/dist_max);
else
normal_accum += nearest_vertices[n]->N();
}
new_normals[iter-begin] = normal_accum;
}
sprintf(message, "Assigning normals...");
progress = 0;
for (VertexIterator iter=begin; iter!=end; iter++)
{
if (callback!=NULL && (++progress%step)==0 && (percentage=int((progress*100)/vertex_count))<100) (callback)(percentage, message);
iter->N() = new_normals[iter-begin].Normalize();
}
};
};
};//end of namespace vcg