NormalAttrib.hh

#pragma once
/*===========================================================================*\
 *                                                                           *
 *                            OpenVolumeMesh                                 *
 *        Copyright (C) 2011 by Computer Graphics Group, RWTH Aachen         *
 *                        www.openvolumemesh.org                             *
 *                                                                           *
 *---------------------------------------------------------------------------*
 *  This file is part of OpenVolumeMesh.                                     *
 *                                                                           *
 *  OpenVolumeMesh 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 with the              *
 *  following exceptions:                                                    *
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 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenVolumeMesh is distributed in the hope that it will be useful,        *
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
 *  GNU Lesser General Public License for more details.                      *
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\*===========================================================================*/
 
 
#include <cassert>
 
#include <OpenVolumeMesh/Core/Handles.hh>
#include <OpenVolumeMesh/Attribs/OpenVolumeMeshStatus.hh>
#include <OpenVolumeMesh/Core/Properties/PropertyPtr.hh>
 
namespace OpenVolumeMesh {
 
template <class GeomKernelT>
class NormalAttrib {
public:
 
    explicit NormalAttrib(GeomKernelT& _kernel);
    virtual ~NormalAttrib();
 
    void update_vertex_normals();
 
    void update_face_normals();
 
    const typename GeomKernelT::PointT& operator[](const VertexHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_->n_vertices());
        return v_normals_[_h];
    }
 
    const typename GeomKernelT::PointT& operator[](const FaceHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_->n_faces());
        return f_normals_[_h];
    }
 
    const typename GeomKernelT::PointT operator[](const HalfFaceHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_->n_halffaces());
        double mult = 1.0;
        if(_h.idx() % 2 == 1) mult = -1.0;
        return f_normals_[kernel_->face_handle(_h)] * mult;
    }
 
    typename GeomKernelT::PointT& operator[](const VertexHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_->n_vertices());
        return v_normals_[_h];
    }
 
    typename GeomKernelT::PointT& operator[](const FaceHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_->n_faces());
        return f_normals_[_h];
    }
 
    typename GeomKernelT::PointT operator[](const HalfFaceHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_->n_halffaces());
        double mult = 1.0;
        if(_h.idx() % 2 == 1) mult = -1.0;
        return f_normals_[kernel_->face_handle(_h)] * mult;
    }
 
private:
 
    void compute_vertex_normal(const VertexHandle& _vh);
 
    const GeomKernelT* kernel_;
 
    VertexPropertyT<typename GeomKernelT::PointT> v_normals_;
    FacePropertyT<typename GeomKernelT::PointT> f_normals_;
 
};
 
} // Namespace OpenVolumeMesh
 
 
#include <OpenVolumeMesh/Attribs/NormalAttribT_impl.hh>