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# pointOnSubdNode.h

    #ifndef _pointOnSubdNode
    #define _pointOnSubdNode
    //
    //-
    // ==========================================================================
    // 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.
    // ==========================================================================
    //+

    // File: pointOnSubdNode.h
    //
    // Dependency Graph Node: pointOnSubd
    //
    // pointOnSubdNode
    //
    // Produces dependency graph node pointOnSubd
    //
    // This node is a simple example of how to query subdivision surface as an
    // input to a dependency node.  This node takes a subdivision surface and a
    // parameter point on subdivision surface and outputs the position and the
    // normal of the surface at that point.
    //
    // One of the inputs for this node is called "subd".  Subdivision surface
    // shape nodes ("subdiv") have two compatible output attributes that you
    // can use as inputs for pointOnSubd node - outSubdiv and worldSubdiv.
    //
    // Another four numerical inputs are needed to specify the parameter point
    // on the subdivision surface.  The two integer values ("faceFirst" and
    // "faceSecond") specify a face.  These two values are the same ones that
    // you see as a part of the selection description when you select a
    // subdivision surface face.  The two floating point values ("uValue" and
    // "vValue") specify the position within that face.
    //
    // A boolean attribute "relative" specifies if the "uValue" and "vValue"
    // are given in the 0-1 range ("relative" is true) or in the U-V range of
    // the specified subdivision surface face ("relative" is false).
    //
    // To run this example, create a subdivision surface (converting from a
    // polygon, for example), create another piece of geometry (NURBS cone, for
    // example) and group the subdivision surface and the other geometry.  Your
    // other geometry should be oriented Y-up.  Now, select the other geometry,
    // followed by a single face on the subdivision surface.  A face at any
    // level is available.  With both of those items selected, type:
    //
    // connectObjectToPointOnSubd
    //
    // and the object will "stick" the the middle of the subdivision surface
    // face.  You can position it elsewhere using the attribute editor for the
    // newly created pointOnSubd node and changing the U and V parameters.
    //
    // An actual MEL running example is provided in the
    // "connectObjectToPointOnSubd.mel" script file.  You need to cut and
    // paste into the script editor and run it.

    #include <maya/MPxNode.h>
    #include <maya/MFnNumericAttribute.h>
    #include <maya/MTypeId.h>

    class pointOnSubd : public MPxNode
    {
    public:
                            pointOnSubd();
        virtual             ~pointOnSubd();

        virtual MStatus     compute( const MPlug& plug, MDataBlock& data );

        static  void*       creator();
        static  MStatus     initialize();

    public:

        // There needs to be a MObject handle declared for each attribute that
        // the node will have.  These handles are needed for getting and setting
        // the values later.
        //
        static  MObject     aSubd;
        static  MObject     aFaceFirst;
        static  MObject     aFaceSecond;
        static  MObject     aRelativeUV;
        static  MObject     aU;
        static  MObject     aV;

        static  MObject     aPoint;
        static  MObject     aPointX;
        static  MObject     aPointY;
        static  MObject     aPointZ;
        static  MObject     aNormal;
        static  MObject     aNormalX;
        static  MObject     aNormalY;
        static  MObject     aNormalZ;

        // The typeid is a unique 32bit indentifier that describes this node.
        // It is used to save and retrieve nodes of this type from the binary
        // file format.  If it is not unique, it will cause file IO problems.
        //
        static  MTypeId     id;
    };

    #endif