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bindT.hh
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//=============================================================================
//
// CLASS Traits
//
//=============================================================================
#ifndef OPENMESH_KERNEL_OSG_BINDT_HH
#define OPENMESH_KERNEL_OSG_BINDT_HH
//== INCLUDES =================================================================
#include <functional>
#include <algorithm>
//
#include <OpenMesh/Core/Mesh/TriMeshT.hh>
#include <OpenMesh/Core/Utils/color_cast.hh>
#include <OpenMesh/Tools/Utils/GLConstAsString.hh>
#include <OpenSG/OSGGeometry.h>
//
#include "color_cast.hh"
//== NAMESPACES ===============================================================
namespace OpenMesh {
namespace Kernel_OSG {
//== CLASS DEFINITION =========================================================
inline
bool type_is_valid( unsigned char _t )
{
return _t == GL_TRIANGLES
|| _t == GL_TRIANGLE_STRIP
|| _t == GL_QUADS
|| _t == GL_POLYGON;
}
template < typename Mesh > inline
bool bind( osg::GeometryPtr& _geo, Mesh& _mesh )
{
_geo = _mesh.createGeometryPtr();
}
template < typename Mesh > inline
bool bind( Mesh& _mesh, osg::GeometryPtr& _geo )
{
using namespace OpenMesh;
using namespace osg;
using namespace std;
bool ok = true;
// pre-check if types are supported
GeoPTypesPtr types = _geo->getTypes();
if ( (size_t)count_if( types->getData(), types->getData()+types->size(),
ptr_fun(type_is_valid) ) != (size_t)types->size() )
return false;
// pre-check if it is a multi-indexed geometry, which is not supported!
if ( _geo->getIndexMapping().getSize() > 1 )
{
omerr << "OpenMesh::Kernel_OSG::bind(): Multi-indexed geometry is not supported!\n";
return false;
}
// create shortcuts
GeoPLengthsPtr lengths = _geo->getLengths();
GeoIndicesPtr indices = _geo->getIndices();
GeoPositionsPtr pos = _geo->getPositions();
GeoNormalsPtr normals = _geo->getNormals();
GeoColorsPtr colors = _geo->getColors();
// -------------------- now convert everything to polygon/triangles
size_t tidx, bidx; // types; base index into indices
vector< VertexHandle > vhandles;
// ---------- initialize geometry
{
VertexHandle vh;
typedef typename Mesh::Color color_t;
bool bind_normal = (normals!=NullFC) && _mesh.has_vertex_normals();
bool bind_color = (colors !=NullFC) && _mesh.has_vertex_colors();
for (bidx=0; bidx < pos->size(); ++bidx)
{
vh = _mesh.add_vertex( pos->getValue(bidx) );
if ( bind_normal )
_mesh.set_normal(vh, normals->getValue(bidx));
if ( bind_color )
_mesh.set_color(vh, color_cast<color_t>(colors->getValue(bidx)));
}
}
// ---------- create topology
FaceHandle fh;
size_t max_bidx = indices != NullFC ? indices->size() : pos->size();
for (bidx=tidx=0; ok && tidx<types->size() && bidx < max_bidx; ++tidx)
{
switch( types->getValue(tidx) )
{
case GL_TRIANGLES:
vhandles.resize(3);
for(size_t lidx=0; lidx < lengths->getValue(tidx)-2; lidx+=3)
{
if (indices == NullFC ) {
vhandles[0] = VertexHandle(bidx+lidx);
vhandles[1] = VertexHandle(bidx+lidx+1);
vhandles[2] = VertexHandle(bidx+lidx+2);
}
else {
vhandles[0] = VertexHandle(indices->getValue(bidx+lidx ) );
vhandles[1] = VertexHandle(indices->getValue(bidx+lidx+1) );
vhandles[2] = VertexHandle(indices->getValue(bidx+lidx+2) );
}
if ( !(fh = _mesh.add_face( vhandles )).is_valid() )
{
// if fh is complex try swapped order
swap(vhandles[2], vhandles[1]);
fh = _mesh.add_face( vhandles );
}
ok = fh.is_valid();
}
break;
case GL_TRIANGLE_STRIP:
vhandles.resize(3);
for (size_t lidx=0; lidx < lengths->getValue(tidx)-2; ++lidx)
{
if (indices == NullFC ) {
vhandles[0] = VertexHandle(bidx+lidx);
vhandles[1] = VertexHandle(bidx+lidx+1);
vhandles[2] = VertexHandle(bidx+lidx+2);
}
else {
vhandles[0] = VertexHandle(indices->getValue(bidx+lidx ) );
vhandles[1] = VertexHandle(indices->getValue(bidx+lidx+1) );
vhandles[2] = VertexHandle(indices->getValue(bidx+lidx+2) );
}
if (vhandles[0]!=vhandles[2] &&
vhandles[0]!=vhandles[1] &&
vhandles[1]!=vhandles[2])
{
// if fh is complex try swapped order
bool swapped(false);
if (lidx % 2) // odd numbered triplet must be reordered
swap(vhandles[2], vhandles[1]);
if ( !(fh = _mesh.add_face( vhandles )).is_valid() )
{
omlog << "OpenMesh::Kernel_OSG::bind(): complex entity!\n";
swap(vhandles[2], vhandles[1]);
fh = _mesh.add_face( vhandles );
swapped = true;
}
ok = fh.is_valid();
}
}
break;
case GL_QUADS:
vhandles.resize(4);
for(size_t nf=_mesh.n_faces(), lidx=0;
lidx < lengths->getValue(tidx)-3; lidx+=4)
{
if (indices == NullFC ) {
vhandles[0] = VertexHandle(bidx+lidx);
vhandles[1] = VertexHandle(bidx+lidx+1);
vhandles[2] = VertexHandle(bidx+lidx+2);
vhandles[3] = VertexHandle(bidx+lidx+3);
}
else {
vhandles[0] = VertexHandle(indices->getValue(bidx+lidx ) );
vhandles[1] = VertexHandle(indices->getValue(bidx+lidx+1) );
vhandles[2] = VertexHandle(indices->getValue(bidx+lidx+2) );
vhandles[3] = VertexHandle(indices->getValue(bidx+lidx+3) );
}
fh = _mesh.add_face( vhandles );
ok = ( Mesh::Face::is_triangle() && (_mesh.n_faces()==(nf+2)))
|| fh.is_valid();
nf = _mesh.n_faces();
}
break;
case GL_POLYGON:
{
size_t ne = lengths->getValue(tidx);
size_t nf = _mesh.n_faces();
vhandles.resize(ne);
for(size_t lidx=0; lidx < ne; ++lidx)
vhandles[lidx] = (indices == NullFC)
? VertexHandle(bidx+lidx)
: VertexHandle(indices->getValue(bidx+lidx) );
fh = _mesh.add_face( vhandles );
ok = ( Mesh::Face::is_triangle() && (_mesh.n_faces()==nf+ne-2) )
|| fh.is_valid();
break;
}
default:
cerr << "Warning! Skipping unsupported type "
<< types->getValue(tidx) << " '"
<< Utils::GLenum_as_string( types->getValue(tidx) ) << "'\n";
}
// update base index into indices for next face type
bidx += lengths->getValue(tidx);
}
if (ok)
ok=_mesh.bind(_geo);
else
_mesh.clear();
return ok;
}
//=============================================================================
} // namespace Kernel_OSG
} // namespace OpenMesh
//=============================================================================
#endif // OPENMESH_KERNEL_OSG_BINDT_HH defined
//=============================================================================
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition MeshItems.hh:59
OpenMesh::Kernel_OSG
In this namespace resides the OpenSG integration of OpenMesh.
OpenMesh::Kernel_OSG::bind
bool bind(osg::GeometryPtr &_geo, Mesh &_mesh)
Bind a OpenSG geometry to a mesh.
Definition bindT.hh:101
OpenMesh::VectorT::swap
void swap(VectorT< Scalar, DIM > &_v1, VectorT< Scalar, DIM > &_v2) noexcept(noexcept(_v1.swap(_v2)))
non-member swap
Definition Vector11T.hh:741
OpenMesh::BaseHandle::is_valid
bool is_valid() const
The handle is valid iff the index is not negative.
Definition Handles.hh:72
OpenMesh::VertexHandle
Handle for a vertex entity.
Definition Handles.hh:121
OpenMesh::FaceHandle
Handle for a face entity.
Definition Handles.hh:142
OpenMesh::PolyMeshT< AttribKernel >::Color
AttribKernel::Color Color
Definition PolyMeshT.hh:116