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# polyWriter.h

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
    //
    // Use of this software is subject to the terms of the Autodesk
    // license agreement provided at the time of installation or download,
    // or which otherwise accompanies this software in either electronic
    // or hard copy form.
    // ==========================================================================
    //+

    #ifndef __POLYWRITER_H
    #define __POLYWRITER_H

    // polyWriter.h

    // *****************************************************************************
    //
    // CLASS:    polyWriter
    //
    // *****************************************************************************
    //
    // CLASS DESCRIPTION (polyWriter)
    //
    // polyWriter is a class used for creating polygonal mesh exporter plugins.  Its
    // purpose is to output polygonal mesh data in the format required.
    //
    // To use this class, derive a new class and begin by adding the following *.h
    // files:
    //    #include <maya/MFStream.h>
    //
    // The following functions must be implemented:
    // constructor - which takes in MDagPath and MStatus object addresses
    // destructor - which destroys any objects created in the constructor
    // writeToFile() - which performs the actual data export
    // outputSingleSet() - which performs the export of a particular polygonal set
    //                     on the mesh
    //
    // The extractGeometry() function may be overridden to extract more data that
    // it is doing currently, but be sure to call this class' extractGeometry()
    // method as its first operation so that essential data is extracted.
    //
    // It is recommended that smaller helper functions are added to any derived
    // classes, to export and format specific data about the mesh.
    //
    // Once the derived class has been defined, create and return a new object of
    // this type in the createPolyWriter() function that must be defined in any
    // class derived from the polyExporter class.
    //
    // For examples, see the classes polyRawWriter and polyX3DWriter
    //
    // *****************************************************************************

    #include <maya/MFnMesh.h>
    #include <maya/MPointArray.h>
    #include <maya/MFloatVectorArray.h>
    #include <maya/MFloatArray.h>

    class polyWriter {

        public:
                                polyWriter (MDagPath dagPath, MStatus& status);
            virtual             ~polyWriter ();
            virtual MStatus     extractGeometry ();
            virtual MStatus     writeToFile (ostream & os) = 0;

        protected:
            //Methods
            //
                    MObject     findShader (const MObject& setNode);
            virtual MStatus     outputSets (ostream& os);
            virtual MStatus     outputSingleSet (ostream& os,
                                                 MString setName,
                                                 MIntArray faces,
                                                 MString textureName) = 0;
            static  void        outputTabs (ostream & os, unsigned int tabCount);

            //Data Members
            //

            //the current UV set's name
            //
            MString             fCurrentUVSetName;

            //for storing general mesh information
            //
            MPointArray         fVertexArray;
            MColorArray         fColorArray;
            MFloatVectorArray   fNormalArray;
            MFloatVectorArray   fTangentArray;
            MFloatVectorArray   fBinormalArray;

            //for storing DAG objects
            //
            MFnMesh*            fMesh;
            MDagPath*           fDagPath;
            MObjectArray        fPolygonSets;
            MObjectArray        fPolygonComponents;
    };

    #endif /*__POLYWRITER_H*/