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Robert Osfield
2016-12-13 10:47:12 +00:00
parent d6c245a2f3
commit d57a67e31c
1 changed files with 133 additions and 0 deletions
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src/osgPlugins/OpenCASCADE/ReaderWriterOpenCASCADE.h Normal file
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/*
* IGES importer for OpenSceneGraph.
* Copyright (c)2013 VizExperts India Pvt. Ltd.
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _READERWRITERIGES_H_
#define _READERWRITERIGES_H_
/// \file ReaderWritterOpenCASCADE.h
/// \brief header file for creating osgdb plugin for IGES format
/// \author Abhishek Bansal, Engineer Graphics, vizExperts India Pvt. Ltd.
#ifdef WIN32
/// \brief preproccessor macro required for compilation with open cascade
/// \todo not sure what it does
#define WNT
#endif
#include <TDF_LabelSequence.hxx>
#include <XCAFDoc_ColorTool.hxx>
#include <XCAFDoc_ShapeTool.hxx>
#include <TopoDS_Shape.hxx>
#include <gp_Trsf.hxx>
#include <osg/Notify>
#include <osg/Geode>
#include <osg/Geometry>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/FileNameUtils>
#include <osgDB/FileUtils>
#include <osgUtil/TriStripVisitor>
/// \class ReaderWritterOpenCASCADE
/// \brief contains implementation of reading IGES models
/// depends on OpenCascade library
/// this code was written with version 6.6.0
/// \todo enabling/disabling Healing can be added as reader writer options
class ReaderWritterOpenCASCADE: public osgDB::ReaderWriter
{
public:
/// \brief constructor
ReaderWritterOpenCASCADE();
/// \brief returns class name
virtual const char* className() const { return "STEP/IGES Reader"; }
virtual osgDB::ReaderWriter::ReadResult readNode(const std::string& fileName, const osgDB::ReaderWriter::Options*) const;
virtual osgDB::ReaderWriter::WriteResult writeNode(const osg::Node&, const std::string&, const Options* =NULL) const ;
private:
/// \brief following class will contain all reading related functionality
/// \detail this class uses OCT XDE module to read IGES/STEP file. XDE mechanism is needed
/// to find out colors and transformation of sub shapes.
/// normal OCCTKReader wasn't giving very good results with shapes. Edges weren't sharp enough
/// and also there is no way in which we can get color information with that
/// \Note Go through XDE user guide and IGES User guide supplied with
/// \todo OSG automatic normal calculation is not working good for few mnodels
/// try to get from XDE document only
class OCCTKReader
{
public:
/// \brief this function is single point of contact for this class.
/// it takes path of IGES file and returns an OpenSceneGraph Geode
/// which directly can be used anywhere. It calculates normals using osgUtil::smoother
osg::ref_ptr<osg::Geode> igesToOSGGeode(const std::string& filePath);
private:
/// \brief heals a opencascade shape
/// \detail http://www.opencascade.org/org/forum/thread_12716/?forum=3
/// Usually IGES files suffer from precision problems (when transfering from
/// one CAD system to another).It might be the case that faces are not sewed
/// properly, or do not have the right precision, and so the tesselator does
/// not treat them like "sewed". this needs to be done for sewing
/// \param[in,out] shape opencascade shape to be healed
void _healShape(TopoDS_Shape& shape);
/// \brief recursively traverse opencascade assembly structure and build a osg geode
/// this function also finds color for leaf node shapes and calculates transformation from parent
/// to leaf
/// \param[in] shapeTree its a OCT(OpenCascade Technology) XDE document label which might contain children or referred shapes
/// \param[in] transformation contains transformation matrix to be applied
void _traverse(const TDF_Label &shapeTree, gp_Trsf& transformation);
/// \brief takes and OpenCascadeShape and returns OSG geometry(drawable), which further can be added to a geode
/// \detail it iterates shape and breaks it into faces, builds vertex list, color list and creates geometry
/// transformation is applied to each vertex before storing it into vertex list
/// all vertices are assigned same color
/// \param[in] shape shape to be converted in geometry. Not a const because it needs to be modified if healing
/// is enabled
/// \param[in] color color of geometry
/// \param[in] transformation matrix with which vertex position has to be transformed
osg::ref_ptr<osg::Geometry> _createGeometryFromShape(TopoDS_Shape& shape, const osg::Vec3& color, gp_Trsf& transformation);
private:
/// \bried XDE document color tool it stores all colors in color table
/// and used to get color from a label
Handle(XCAFDoc_ColorTool) _colorTool;
/// \brief geode to contain full model
osg::ref_ptr<osg::Geode> _modelGeode;
/// \brief shape tool instance to deal with shapes(simple shapes), referredShape, children etc
Handle (XCAFDoc_ShapeTool) _assembly;
};
};
#endif // _READERWRITERIGES_H_