C:/cmcintos/defOrgs/examples/DefOrgViewer/Source/BYUToMeta.cxx

#include "BYUToMeta.h"

// Convert BYU surface files to .meta files. Assumes 1 object per file and a 3D triangular mesh.
int BYUToMeta( std::string BYUFileName, std::string metaFileName )
{
        int SUCCESS = 1;
        int FAILURE = -1;

        std::ifstream inFile( BYUFileName.c_str() );
        if( !inFile.good() )
        { 
                std::cerr << "Error opening input file '" << BYUFileName << "'." << std::endl;
                return FAILURE; 
        }

        std::ofstream outFile( metaFileName.c_str() );
        //std::ofstream outFile( "C:\\Documents and Settings\\arova\\Desktop\\defOrgs_working_copy\\examples\\DefOrgViewer\\Build\\data\\OFTest" );
        if( !outFile.good() )
        { 
                std::cerr << "Error creating output file '" << metaFileName << "'." << std::endl;
                return FAILURE; 
        }

        // BYU format first line is PART_NUM, VERTEX_NUM, POLY_NUM
        int partNum;
        inFile >> partNum;
        // assume PART_NUM will always be 1:
        if( partNum != 1 )
        {
                std::cerr << "Format error, PART_NUM (the first number in the file) is " << partNum 
                        << ". This function expects PART_NUM to be 1." << std::endl;
                return FAILURE;
        }
        
        int nVertices, nTriangles; 
        inFile >> nVertices >> nTriangles;

        // write meta header:
        outFile << "ObjectType = Scene" << std::endl
                << "NDims = 3" << std::endl
                << "NObjects = 1" << std::endl
                << "ObjectType = Mesh" << std::endl
                << "NDims = 3" << std::endl
                << "ID = 0" << std::endl
                << "TransformMatrix = 1 0 0 0 1 0 0 0 1" << std::endl
                << "Offset = 0 0 0" << std::endl
                << "CenterOfRotation = 0 0 0" << std::endl
                << "ElementSpacing = 1 1 1" << std::endl
                << "PointType = MET_FLOAT" << std::endl
                << "PointDataType = MET_FLOAT" << std::endl
                << "CellDataType = MET_FLOAT" << std::endl
                << "NCellTypes = 1" << std::endl
                << "PointDim = ID x y ..." << std::endl
                << "NPoints = " << nVertices << std::endl
                << "Points = " << std::endl;

        // read/write vertex data:
        double vertex;
        for( int i=0; i<nVertices; i++ )
        {
                outFile << i << " "; // meta file wants "line numbers" before each set of points
                for( unsigned int j=0; j<3; j++ )
                {
                        inFile >> vertex;
                        outFile << vertex <<  " ";
                }
                outFile << std::endl;
        }

        // write more info required by meta format:
        outFile << "CellType = TRI" << std::endl
                << "NCells = " << nTriangles << std::endl
                << "Cells = " << std::endl;

        // read and write corrected triangle data:
        double tIndex;
        //for( int i=0; i<nTriangles; i++ )
        int i = -1;
        while( inFile.peek() != EOF ) // TODO: change back to 'for' when Matlab BYU file code is fixed to output proper numbers
        {
                i++; // TODO: take this out when changing back to a for loop
                outFile << i << " "; // meta file wants "line numbers" before each set of indices
                for( unsigned int j=0; j<2; j++ )
                {
                        inFile >> tIndex;
                        tIndex -= 1;
                        outFile << tIndex << " ";
                }
                inFile >> tIndex;
                tIndex = abs( tIndex );
                tIndex -= 1;
                outFile << tIndex << std::endl;
        }

        // clean up:
        inFile.close();
        outFile.close();

        return SUCCESS;
}

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