File OsgFactory.cpp

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// Copyright (c) 2012-2013, IGN France.
// Copyright (c) 2012-2022, Oslandia.
// SPDX-License-Identifier: LGPL-2.0-or-later

#include "SFCGAL/config.h"
#ifdef SFCGAL_WITH_OSG

#include "SFCGAL/detail/io/OsgFactory.h"

#include "SFCGAL/GeometryCollection.h"
#include "SFCGAL/LineString.h"
#include "SFCGAL/Point.h"
#include "SFCGAL/Polygon.h"
#include "SFCGAL/PolyhedralSurface.h"
#include "SFCGAL/Solid.h"
#include "SFCGAL/Triangle.h"
#include "SFCGAL/TriangulatedSurface.h"

#include "SFCGAL/Exception.h"
#include "SFCGAL/triangulate/triangulatePolygon.h"

namespace SFCGAL {
namespace detail {
namespace io {

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const Geometry &g)
{
  if (g.is<GeometryCollection>()) {
    addToGeometry(geometry, g.as<GeometryCollection>());
    return;
  }

  switch (g.geometryTypeId()) {
  case TYPE_POINT:
    addToGeometry(geometry, g.as<Point>());
    break;

  case TYPE_LINESTRING:
    addToGeometry(geometry, g.as<LineString>());
    break;

  case TYPE_POLYGON:
    addToGeometry(geometry, g.as<Polygon>());
    break;

  case TYPE_TRIANGLE:
    addToGeometry(geometry, g.as<Triangle>());
    break;

  case TYPE_TRIANGULATEDSURFACE:
    addToGeometry(geometry, g.as<TriangulatedSurface>());
    break;

  case TYPE_POLYHEDRALSURFACE:
    addToGeometry(geometry, g.as<PolyhedralSurface>());
    break;

  case TYPE_SOLID:
    addToGeometry(geometry, g.as<Solid>());
    break;

  default:
    BOOST_THROW_EXCEPTION(Exception(
        (boost::format("can't convert %1% to osg::Geometry") % g.geometryType())
            .str()));
    break;
  }
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const Point &p)
{
  osg::Vec3Array *vertices =
      static_cast<osg::Vec3Array *>(geometry->getVertexArray());

  size_t                 start = vertices->size();
  osg::DrawElementsUInt *primitiveSet =
      new osg::DrawElementsUInt(osg::PrimitiveSet::POINTS, start);
  primitiveSet->push_back(createVertex(vertices, p));
  geometry->addPrimitiveSet(primitiveSet);
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const LineString &g)
{
  osg::Vec3Array *vertices =
      static_cast<osg::Vec3Array *>(geometry->getVertexArray());

  size_t start = vertices->size();

  for (size_t i = 0; i < g.numPoints(); i++) {
    createVertex(vertices, g.pointN(i));
  }

  geometry->addPrimitiveSet(
      new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, start, g.numPoints()));
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const Triangle &g)
{
  osg::Vec3Array *vertices =
      static_cast<osg::Vec3Array *>(geometry->getVertexArray());

  size_t                 start = vertices->size();
  osg::DrawElementsUInt *primitiveSet =
      new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, start);

  for (size_t i = 0; i < 3; i++) {
    primitiveSet->push_back(createVertex(vertices, g.vertex(i)));
  }

  geometry->addPrimitiveSet(primitiveSet);
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const TriangulatedSurface &g)
{
  osg::Vec3Array *vertices =
      static_cast<osg::Vec3Array *>(geometry->getVertexArray());
  osg::Vec3Array *normals =
      static_cast<osg::Vec3Array *>(geometry->getNormalArray());

  size_t start = vertices->size();

  for (size_t i = 0; i < g.numGeometries(); i++) {
    const Triangle &triangle = g.geometryN(i);

    osg::Vec3 a = createVec3(triangle.vertex(0));
    osg::Vec3 b = createVec3(triangle.vertex(1));
    osg::Vec3 c = createVec3(triangle.vertex(2));

    // vertices
    createVertex(vertices, a);
    createVertex(vertices, b);
    createVertex(vertices, c);

    // normal
    osg::Vec3 normal = (c - b) ^ (a - b);
    normal.normalize();

    normals->push_back(normal);
    normals->push_back(normal);
    normals->push_back(normal);
  }

  geometry->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
  geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,
                                                start, g.numGeometries() * 3));
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const Polygon &g)
{
  TriangulatedSurface surf;
  triangulate::triangulatePolygon3D(g, surf);
  addToGeometry(geometry, surf);
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const PolyhedralSurface &g)
{
  TriangulatedSurface surf;
  triangulate::triangulatePolygon3D(g, surf);
  addToGeometry(geometry, surf);
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const Solid &g)
{
  TriangulatedSurface triangulatedSurface;

  for (size_t i = 0; i < g.numShells(); i++) {
    triangulate::triangulatePolygon3D(g.shellN(i), triangulatedSurface);
  }

  addToGeometry(geometry, triangulatedSurface);
}

void
OsgFactory::addToGeometry(osg::Geometry *geometry, const GeometryCollection &g)
{
  for (size_t i = 0; i < g.numGeometries(); ++i) {
    // pseudo-recurse call
    addToGeometry(geometry, g.geometryN(i));
  }
}
osg::Geometry *
OsgFactory::createGeometry(const Geometry &g)
{
  if (g.isEmpty()) {
    return NULL;
  }

  osg::ref_ptr<osg::Geometry> geometry(new osg::Geometry);
  geometry->setVertexArray(new osg::Vec3Array());
  geometry->setNormalArray(new osg::Vec3Array());

  addToGeometry(geometry.get(), g);
  return geometry.release();
}

osg::Vec3
OsgFactory::createVec3(const Point &g) const
{
  return osg::Vec3(CGAL::to_double(g.x()), CGAL::to_double(g.y()),
                   CGAL::to_double(g.z()));
}

size_t
OsgFactory::createVertex(osg::Vec3Array *vertices, const Point &g)
{
  return createVertex(vertices, createVec3(g));
}

size_t
OsgFactory::createVertex(osg::Vec3Array *vertices, const osg::Vec3 &g)
{
  size_t id = vertices->size();
  vertices->push_back(g);
  return id;
}

} // namespace io
} // namespace detail
} // namespace SFCGAL

#endif // SFCGAL_WITH_OSG