closestPointOnCurve/closestTangentUAndDistance.cpp

closestPointOnCurve/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);
}