DGtal: dgtalCalculus-halfsphere.cpp File Reference

#include <iostream>
#include <string>
#include <DGtal/base/Common.h>
#include <DGtal/helpers/StdDefs.h>
#include <DGtal/helpers/Shortcuts.h>
#include <DGtal/helpers/ShortcutsGeometry.h>
#include <DGtal/shapes/SurfaceMesh.h>
#include <DGtal/dec/PolygonalCalculus.h>
#include <DGtal/dec/GeodesicsInHeat.h>
#include <polyscope/polyscope.h>
#include <polyscope/surface_mesh.h>
#include <polyscope/pick.h>
#include "ConfigExamples.h"
#include <Eigen/Dense>
#include <Eigen/Sparse>

Include dependency graph for dgtalCalculus-halfsphere.cpp:

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Typedefs
typedef Shortcuts< Z3i::KSpace >	SH3

typedef ShortcutsGeometry< Z3i::KSpace >	SHG3

typedef SurfaceMesh< RealPoint, RealVector >	SurfMesh

typedef SurfMesh::Face	Face

typedef SurfMesh::Vertex	Vertex

typedef PolygonalCalculus< SH3::RealPoint, SH3::RealVector >	PolyCalculus

Functions
void	precompute ()

void	picksource (int v_idx)

void	computeGeodesics ()

void	myCallback ()

int	main ()

Variables
polyscope::SurfaceMesh *	psMesh

SurfMesh	surfmesh

float	dt = 2.0

float	Lambda = 0.05

bool	Mixed = false

GeodesicsInHeat< PolyCalculus > *	heat

PolyCalculus *	calculus

int	vertex_idx = -1

int	face_idx = -1

int	edge_idx = -1

bool	isPrecomputed =false

Detailed Description

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Author: Jacques-Olivier Lachaud (jacqu.nosp@m.es-o.nosp@m.livie.nosp@m.r.la.nosp@m.chaud.nosp@m.@uni.nosp@m.v-sav.nosp@m.oie..nosp@m.fr ) Laboratory of Mathematics (CNRS, UMR 5127), University of Savoie, France

Date: 2022/04/10

This file is part of the DGtal library.

Definition in file dgtalCalculus-halfsphere.cpp.

Typedef Documentation

◆ Face

typedef SurfMesh::Face Face

Definition at line 54 of file dgtalCalculus-halfsphere.cpp.

◆ PolyCalculus

typedef PolygonalCalculus<SH3::RealPoint,SH3::RealVector> PolyCalculus

Definition at line 56 of file dgtalCalculus-halfsphere.cpp.

◆ SH3

typedef Shortcuts<Z3i::KSpace> SH3

Definition at line 50 of file dgtalCalculus-halfsphere.cpp.

◆ SHG3

typedef ShortcutsGeometry<Z3i::KSpace> SHG3

Definition at line 51 of file dgtalCalculus-halfsphere.cpp.

◆ SurfMesh

typedef SurfaceMesh< RealPoint, RealVector > SurfMesh

Definition at line 53 of file dgtalCalculus-halfsphere.cpp.

◆ Vertex

typedef SurfMesh::Vertex Vertex

Definition at line 55 of file dgtalCalculus-halfsphere.cpp.

Function Documentation

◆ computeGeodesics()

void computeGeodesics ( )

Definition at line 97 of file dgtalCalculus-halfsphere.cpp.

 {
   // heat->addSource( 0 ); //Forcing one seed (for screenshots)
   GeodesicsInHeat<PolyCalculus>::Vector dist = heat->compute();
   psMesh->addVertexDistanceQuantity("geodesic", dist);
 }

References heat, and psMesh.

Referenced by myCallback().

◆ main()

int main ( void )

Definition at line 155 of file dgtalCalculus-halfsphere.cpp.

 {
   auto params = SH3::defaultParameters() | SHG3::defaultParameters() |  SHG3::parametersGeometryEstimation();
   params("surfaceComponents", "All");
   params("polynomial", "x^2+(y+1)^2+z^2-1.0")
     ("minAABB",-1.0)("maxAABB",1.0)("offset",1.0)
     ("gridstep",0.0625);
   auto shape        = SH3::makeImplicitShape3D( params );
   auto dshape       = SH3::makeDigitizedImplicitShape3D( shape, params );
   auto K            = SH3::getKSpace( params );
   auto binary_image = SH3::makeBinaryImage( dshape, params );
   auto surface      = SH3::makeDigitalSurface( binary_image, K, params );
   auto primalSurface= SH3::makePrimalSurfaceMesh(surface);
   auto surfels      = SH3::getSurfelRange( surface, params );
   auto normals      = SHG3::getNormalVectors( shape, K, surfels, params );
   
   //Need to convert the faces
   std::vector<std::vector<SH3::SurfaceMesh::Vertex>> faces;
   std::vector<RealPoint> positions;
   
   for(auto face= 0 ; face < primalSurface->nbFaces(); ++face)
     faces.push_back(primalSurface->incidentVertices( face ));
   
   //Recasting to vector of vertices
   positions = primalSurface->positions();
  
   surfmesh = SurfMesh(positions.begin(),
                       positions.end(),
                       faces.begin(),
                       faces.end());
   surfmesh.setFaceNormals( normals.cbegin(), normals.cend() );
   std::cout << surfmesh << std::endl;
   std::cout<<"number of non-manifold Edges = " << surfmesh.computeNonManifoldEdges().size()<<std::endl;
   
   // Initialize polyscope
   polyscope::init();
  
   psMesh = polyscope::registerSurfaceMesh("digital surface", positions, faces);
  
   // Set the callback function
   polyscope::state::userCallback = myCallback;
   polyscope::show();
   return EXIT_SUCCESS;
 }

References binary_image, DGtal::SurfaceMesh< TRealPoint, TRealVector >::computeNonManifoldEdges(), init(), K, myCallback(), psMesh, DGtal::SurfaceMesh< TRealPoint, TRealVector >::setFaceNormals(), surface, and surfmesh.

◆ myCallback()

void myCallback ( )

Definition at line 105 of file dgtalCalculus-halfsphere.cpp.

 {
   // Select a vertex with the mouse
   if (polyscope::pick::haveSelection()) {
     bool goodSelection = false;
     auto selection = polyscope::pick::getSelection();
     auto selectedSurface = static_cast<polyscope::SurfaceMesh*>(selection.first);
     size_t idx = selection.second;
  
     // Only authorize selection on the input surface and the reconstruction
     auto surf = polyscope::getSurfaceMesh("digital surface");
     goodSelection = goodSelection || (selectedSurface == surf);
     const auto nv = selectedSurface->nVertices(); 
     // Validate that it its a face index
     if ( goodSelection && idx < nv )
       {
         std::ostringstream otext;
         otext << "Selected vertex = " << idx;
         ImGui::Text( "%s", otext.str().c_str() );
         vertex_idx = idx;
         if (!isPrecomputed)
           {
             precompute();
             isPrecomputed=true;
           }
         picksource( vertex_idx );
       }
   }
   
   ImGui::SliderFloat("Lambda parameter", &Lambda, 0.0, 1.0);
   ImGui::SliderFloat("dt", &dt, 0.,4.);
   ImGui::Checkbox("Use mixed Neumann+Dirichlet heat solution", &Mixed);
   if(ImGui::Button("Precomputation (required if you change the dt)"))
   {
     precompute();
     isPrecomputed=true;
   }
   
   if(ImGui::Button("Compute geodesic"))
   {
     if (!isPrecomputed)
     {
       precompute();
       isPrecomputed=true;
     }
     computeGeodesics();
   }
   ImGui::Text("You can use the mouse left-click to select the new source point.");
 }

References computeGeodesics(), dt, isPrecomputed, Lambda, Mixed, picksource(), precompute(), and vertex_idx.

Referenced by main().

◆ picksource()

void picksource ( int v_idx )

Definition at line 90 of file dgtalCalculus-halfsphere.cpp.

 {
   heat->addSource( v_idx );
   GeodesicsInHeat<PolyCalculus>::Vector source = heat->source();
   psMesh->addVertexScalarQuantity("source", source);
 }

References heat, and psMesh.

Referenced by myCallback().

◆ precompute()

void precompute ( )

Definition at line 71 of file dgtalCalculus-halfsphere.cpp.

 {
   auto projEmbedder = [&]( int f, int v)
   {
     auto nn = surfmesh.faceNormal( f );
     RealPoint centroid = surfmesh.faceCentroid( f );
     RealPoint p = surfmesh.position( v );
     const auto cp = p - centroid;
     RealPoint q = p - nn.dot(cp)*nn;
     return q;
   };
   calculus = new PolyCalculus(surfmesh);
   calculus->setEmbedder( projEmbedder );
   heat = new GeodesicsInHeat<PolyCalculus>(calculus);
   trace.beginBlock("Init solvers");
   heat->init(dt,Lambda,Mixed);
   trace.endBlock();
 }