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# closestTangentUAndDistance.cpp

    //-
    // ==========================================================================
    // 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.
    // ==========================================================================
    //+

    // DISCLAIMER: THIS PLUGIN IS PROVIDED AS IS.  IT IS NOT SUPPORTED BY

    //            AUTODESK, SO PLEASE USE AND MODIFY AT YOUR OWN RISK.

    //

    // PLUGIN NAME: closestPointOnCurve v1.0

    // FILE: closestTangentUAndDistance.cpp

    // DESCRIPTION: -Utility function definition, used by both the command and node.

    //              -Please see readme.txt for full details.

    // AUTHOR: QT

    // REFERENCES: -This plugin's concept is based off of the "closestPointOnSurface" node.

    //             -The MEL script AEclosestPointOnSurfaceTemplate.mel was referred to for

    //              the AE template MEL script that accompanies the closestPointOnCurve node.

    // LAST UPDATED: Oct. 13th, 2001.

    // COMPILED AND TESTED ON: Maya 4.0 on Windows

    // HEADER FILE:

    #include "closestTangentUAndDistance.h"

    // FUNCTION WHICH TAKES A SPECIFIED INPUT CURVE AND A WORLDSPACE POSITION, AND FINDS THE CLOSEST POSITION, NORMAL, TANGENT, PARAMETER-U AND CLOSEST-DISTANCE FROM THE CURVE:

    void closestTangentUAndDistance(MDagPath curveDagPath, MPoint inPosition, MPoint &position, MVector &normal, MVector &tangent, double &paramU, double &distance, MObject theCurve)

    {

       // FIND THE CLOSEST POSITION AND PARAMETER-U FROM THE INPUT POSITION:

       MFnNurbsCurve curveFn(curveDagPath);

       if (theCurve!=MObject::kNullObj)

          curveFn.setObject(theCurve);

       position = curveFn.closestPoint(inPosition, &paramU, 0.0, MSpace::kWorld);

       // FIND THE NORMAL, TANGENT AND DISTANCE FROM THE CLOSEST POINT:

       normal = curveFn.normal(paramU, MSpace::kWorld);

       tangent = curveFn.tangent(paramU, MSpace::kWorld);

       distance = curveFn.distanceToPoint(inPosition, MSpace::kWorld);

    }