void Various_Processing_Component::LaplacianSmoothing (PolyhedronPtr pMesh, double deformFactor, int iteraNum, bool preserveBoundaries)
{
Vertex_iterator pVertex;
int numVertex = pMesh->size_of_vertices();
Vector * newPositions = new Vector[numVertex];
for (int i=0; i<iteraNum; i++)
{
int n = 0;
for (pVertex = pMesh->vertices_begin(); pVertex != pMesh->vertices_end(); pVertex++)
{
Vector currentVector = pVertex->point() - CGAL::ORIGIN;
// do not smooth the boundary vertices if demanded by user
bool is_border_vertex = false;
bool stopFlag = false;
Halfedge_around_vertex_circulator hav = (*pVertex).vertex_begin();
do
{
if (hav->is_border()==true)
{
is_border_vertex = true;
stopFlag = true;
}
hav++;
} while ((hav!=(*pVertex).vertex_begin())&&(stopFlag==false));
if ((preserveBoundaries==true)&&(is_border_vertex==true))
{
newPositions[n] = currentVector;
n++;
continue;
}
std::size_t degree = (*pVertex).vertex_degree();
double alpha = 1.0/degree;
Vector vectemp = Point3d(0,0,0) - CGAL::ORIGIN;
Halfedge_around_vertex_circulator h = (*pVertex).vertex_begin();
do
{
vectemp = vectemp+(h->opposite()->vertex()->point()-CGAL::ORIGIN-currentVector)*alpha;
++h;
} while (h != (*pVertex).vertex_begin());
newPositions[n] = currentVector + deformFactor*vectemp;
n++;
}
n = 0;
for (pVertex = pMesh->vertices_begin(); pVertex != pMesh->vertices_end(); pVertex++)
{
pVertex->point() = Point3d(0,0,0) + newPositions[n];
n++;
}
}
delete [] newPositions;
newPositions = 0;
pMesh->compute_normals();
}
void Various_Processing_Component::NoiseAdditionUniform (PolyhedronPtr pMesh, double noiseIntensity, bool preserveBoundaries)
{
// mesh centre calculation based on discrete "moment".
//TODO: maybe in the future it will be based on volume moment.
int numVertex = pMesh->size_of_vertices();;
Vector centroid = Point3d(0,0,0) - CGAL::ORIGIN;
double distancetoCentroid = 0.0;
Vertex_iterator pVertex;
for (pVertex = pMesh->vertices_begin(); pVertex != pMesh->vertices_end(); pVertex++)
{
Vector vectemp = pVertex->point() - CGAL::ORIGIN;
centroid = centroid + vectemp;
}
centroid = centroid/numVertex;
// calculate the average distance from vertices to mesh centre
for (pVertex = pMesh->vertices_begin(); pVertex!= pMesh->vertices_end(); pVertex++)
{
Vector vectemp = pVertex->point() - CGAL::ORIGIN;
distancetoCentroid = distancetoCentroid + (double)std::sqrt((vectemp - centroid) * (vectemp - centroid));
}
distancetoCentroid = distancetoCentroid/numVertex;
// add random uniform-distributed (between [-noiseLevel, +noiseLevel])
srand((unsigned)time(NULL));
double noisex, noisey, noisez;
double noiseLevel = distancetoCentroid * noiseIntensity;
for (pVertex = pMesh->vertices_begin(); pVertex!= pMesh->vertices_end(); pVertex++)
{
// keep boundaries untouched if demanded by user
bool is_border_vertex = false;
bool stopFlag = false;
Halfedge_around_vertex_circulator hav = (*pVertex).vertex_begin();
do
{
if (hav->is_border()==true)
{
is_border_vertex = true;
stopFlag = true;
}
hav++;
} while ((hav!=(*pVertex).vertex_begin())&&(stopFlag==false));
if ((preserveBoundaries==true)&&(is_border_vertex==true))
continue;
noisex = noiseLevel * (1.0*rand()/RAND_MAX-0.5)*2;
noisey = noiseLevel * (1.0*rand()/RAND_MAX-0.5)*2;
noisez = noiseLevel * (1.0*rand()/RAND_MAX-0.5)*2;
Vector temp = Point3d(noisex, noisey, noisez) - CGAL::ORIGIN;
pVertex->point() = pVertex->point() + temp;
}
// for correct rendering, we need to update the mesh normals
pMesh->compute_normals();
}
// this time, we add Gaussian-distributed additive noise to the mesh vertex coordinates
// the standard deviation of the Gaussian distribution is "noiseLevel = distancetoCentroid * noiseIntensity"
void Various_Processing_Component::NoiseAdditionGaussian (PolyhedronPtr pMesh, double noiseIntensity, bool preserveBoundaries)
{
int numVertex = pMesh->size_of_vertices();;
Vector centroid = Point3d(0,0,0) - CGAL::ORIGIN;
double distancetoCentroid = 0.0;
Vertex_iterator pVertex;
for (pVertex = pMesh->vertices_begin(); pVertex != pMesh->vertices_end(); pVertex++)
{
Vector vectemp = pVertex->point() - CGAL::ORIGIN;
centroid = centroid + vectemp;
}
centroid = centroid/numVertex;
for (pVertex = pMesh->vertices_begin(); pVertex!= pMesh->vertices_end(); pVertex++)
{
Vector vectemp = pVertex->point() - CGAL::ORIGIN;
distancetoCentroid = distancetoCentroid + (double)std::sqrt((vectemp - centroid) * (vectemp - centroid));
}
distancetoCentroid = distancetoCentroid/numVertex;
srand((unsigned)time(NULL));
double noisex, noisey, noisez;
double * gaussNumbers = new double[3];
double noiseLevel = distancetoCentroid * noiseIntensity;
for (pVertex = pMesh->vertices_begin(); pVertex!= pMesh->vertices_end(); pVertex++)
{
bool is_border_vertex = false;
bool stopFlag = false;
Halfedge_around_vertex_circulator hav = (*pVertex).vertex_begin();
do
{
if (hav->is_border()==true)
{
is_border_vertex = true;
stopFlag = true;
}
hav++;
} while ((hav!=(*pVertex).vertex_begin())&&(stopFlag==false));
if ((preserveBoundaries==true)&&(is_border_vertex==true))
continue;
// pseudo-random Gaussian-distributed numbers generation from uniformly-distributed pseudo-random numbers
double x, y, r2;
for (int i=0; i<3; i++)
{
do
{
x = -1.0 + 2.0 * 1.0*rand()/RAND_MAX;
y = -1.0 + 2.0 * 1.0*rand()/RAND_MAX;
r2 = x * x + y * y;
} while ((r2>1.0)||(r2==0.0));
gaussNumbers[i] = y * sqrt(-2.0 * log(r2) / r2);
}
noisex = noiseLevel * gaussNumbers[0];
noisey = noiseLevel * gaussNumbers[1];
noisez = noiseLevel * gaussNumbers[2];
Vector temp = Point3d(noisex, noisey, noisez) - CGAL::ORIGIN;
pVertex->point() = pVertex->point() + temp;
}
pMesh->compute_normals();
delete [] gaussNumbers;
gaussNumbers = 0;
}
