本文将带你了解Maya教程之用六种算法实现maya动画曲线光滑，希望本文对大家学Maya有所帮助

在使用动补数据的时候，经常会有手脚等部位的抖动，特意写了个command，直接将动画曲线平滑一下，不用动画师大量的进行手调，下面是代码：smoothAnimationCurveCmd.h#ifndef   _smoothAnimationCurve_#define _smoothAnimationCurve_ #include   <maya/MPxCommand.h>#include <maya/MObject.h>#include   <maya/MSyntax.h>#include <maya/MFnAnimCurve.h>#include   <maya/MAnimCurveChange.h>#include   <maya/MItDependencyNodes.h>#include   <maya/MSelectionList.h>#include <maya/MItSelectionList.h> class   SmoothAnimationCurveCmd: public MPxCommand{public:    SmoothAnimationCurveCmd();    virtual ~SmoothAnimationCurveCmd();    virtual MStatus doIt( const MArgList&   );    virtual MStatus redoIt();    virtual MStatus undoIt();    virtual bool isUndoable() const { return   true; }    static void *creator(){   return new SmoothAnimationCurveCmd; }      static MSyntax newSyntax();      MStatus compliceMethod( MFnAnimCurve &fnAnim, MAnimCurveChange   *animCache );    MItSelectionList   getSelectObjectsAnimCurves();    private:    MString type;    int method;    unsigned int iterations;    MAnimCurveChange* pAnimCache; };   #endifsmoothAnimationCurveCmd.cpp#include "smoothAnimationCurveCmd.h"#include   <maya/MGlobal.h>#include <maya/MFnPlugin.h>#include   <maya/MDagPath.h>#include <maya/MPlugArray.h>#include   <maya/MObjectArray.h>#include <maya/MArgDatabase.h>#include   <maya/MAnimUtil.h> using namespace std; const char *typeFlag =   "-t", *typeLongFlag = "-type";const char *methodFlag =   "-md", *methodLongFlag = "-method";const char   *iterationsFlag = "-it", *iterationsLongFlag = "-iterations";const   char *helpFlag = "-h", *helpLongFlag = "-help";const char   *helpText = "The smoothAnimCurve command is used to smooth   animcurve." "\nIt has three   parameter." "\nFlags:" "\n   -h    -help " "\n   -it   -iterations  Int" "\n   -md -method      Int" "\n   -t    -type        String" "\nSupported   Mode:     sel(smooth animation curve   only for selected objects)" "\n        all(smooth all animation curves which   in the scene)" "\nFor quick help use: help   smoothAnimCurve";   SmoothAnimationCurveCmd::SmoothAnimationCurveCmd(){    type = "all";    method = 1;    iterations = 1;    pAnimCache = NULL;}   SmoothAnimationCurveCmd::~SmoothAnimationCurveCmd(){    delete pAnimCache;    pAnimCache = NULL;} MSyntax   SmoothAnimationCurveCmd::newSyntax(){      MSyntax syntax;      syntax.addFlag( typeFlag, typeLongFlag, MSyntax::kString );    syntax.addFlag( methodFlag,   methodLongFlag, MSyntax::kLong );      syntax.addFlag( iterationsFlag, iterationsLongFlag,  MSyntax::kLong); syntax.addFlag( helpFlag,   helpLongFlag );    return syntax;}   MStatus SmoothAnimationCurveCmd::doIt( const MArgList &args ){    MStatus stat;    unsigned int j;    MArgDatabase argData( syntax(), args,   &stat );    if( !stat )        return stat;    if ( argData.isFlagSet( typeFlag ) )        argData.getFlagArgument( typeFlag, 0,   type );    if ( argData.isFlagSet(   methodFlag ) )          argData.getFlagArgument( methodFlag, 0, method );    if ( argData.isFlagSet( iterationsFlag )   )        argData.getFlagArgument( iterationsFlag,   0, iterations ); if ( argData.isFlagSet(helpFlag) ) { setResult( helpText   ); return MS::kSuccess; }       pAnimCache = new MAnimCurveChange(); if(type ==   "all"){ MItDependencyNodes animCurves(MFn::kAnimCurve); for (;   !animCurves.isDone(); animCurves.next()) { MObject currentItem =   animCurves.item(); if ( currentItem.isNull()   ) { continue; } MFnAnimCurve fnCurve (currentItem); unsigned int   numKeys = fnCurve.numKeys(); if (numKeys <=   2) { continue; } else { for (j = 0; j < iterations;   j++) { compliceMethod(fnCurve, pAnimCache); } } }    } if(type == "sel"){ MObject   mAnimCurveObj; MItSelectionList animCurveTempIter =   getSelectObjectsAnimCurves(); for(; animCurveTempIter.isDone() != true;   animCurveTempIter.next()){    animCurveTempIter.getDependNode(mAnimCurveObj); //cout <<   mAnimCurveObj.fullPathName() << endl; if ( mAnimCurveObj.isNull()   ) { continue; } MFnAnimCurve fnCurve (mAnimCurveObj); unsigned int   numKeys = fnCurve.numKeys(); if (numKeys <=   2) { continue; } else { for (j = 0; j < iterations;   j++) { compliceMethod(fnCurve, pAnimCache); } } } }     MGlobal::displayInfo(MString("type:   ") + type + " " + MString("method: ") + method +   " " + MString("interations: ") + iterations);    return stat;} MItSelectionList   SmoothAnimationCurveCmd::getSelectObjectsAnimCurves(){    MSelectionList selection;    MSelectionList animCurvesTemp;    /*selection.clear();    animCurvesTemp.clear();*/    MGlobal::getActiveSelectionList(   selection );    MItSelectionList iter(   selection );    unsigned int j, k;    for( ; !iter.isDone(); iter.next() )    {          MPlugArray mPlugArray;          MAnimUtil::findAnimatedPlugs( selection, mPlugArray );        for (j = 0; j < mPlugArray.length();   j++)        {            MObjectArray mObjArray;              MAnimUtil::findAnimation(mPlugArray[j], mObjArray);            for (k = 0; k <   mObjArray.length(); k++ )              {                MObject   animCurveNode = mObjArray[k];                   if (!animCurveNode.hasFn (MFn::kAnimCurve))                {                    continue;                }                //MFnAnimCurve animCurve   (animCurveNode);                  animCurvesTemp.add( animCurveNode );                  //MGlobal::getSelectionListByName( animCurve.name(),  animCurvesTemp);            }        }      } MItSelectionList iterAnimCurvesTemp( animCurvesTemp);    //MItDependencyNodes iterAnimcurves(   iterAnimCurvesTemp, MFn::kAnimCurve );      return iterAnimCurvesTemp;}       MStatus SmoothAnimationCurveCmd::compliceMethod( MFnAnimCurve   &fnAnim,  MAnimCurveChange   *pAnimCache){    MStatus stat;    unsigned int i;    double tempValue;    unsigned int numKeys =   fnAnim.numKeys();    //pAnimCache = new   MAnimCurveChange();    switch ( method   )    {    case    0://三点线性        for (i = 2; i   < numKeys - 2; i++)        {            tempValue = (fnAnim.value(i - 1)   + fnAnim.value(i) + fnAnim.value(i + 1))/3;              fnAnim.setValue(i, tempValue, pAnimCache);        }        break;    case    1://五点二次滤波        for (i = 2; i   < numKeys - 2; i++)        {            tempValue = (12*(fnAnim.value(i -   1) + fnAnim.value(i + 1)) -3*(fnAnim.value(i - 2) + fnAnim.value(i + 2)) +   17*fnAnim.value(i))/35;              fnAnim.setValue(i, tempValue, pAnimCache);        }        break;    case 2://五点钟形滤波        for (i = 2; i < numKeys - 2;   i++)        {            tempValue = (0.11f*(fnAnim.value(i   - 2) + fnAnim.value(i + 2)) + 0.24f*(fnAnim.value(i - 1) + fnAnim.value(i +   1)) + 0.3f*fnAnim.value(i));              fnAnim.setValue(i, tempValue, pAnimCache);        }        break;    case    3://三点汉明滤波        for (i = 2; i   < numKeys - 2; i++)        {            tempValue =   (0.07f*(fnAnim.value(i - 1)) + 0.86f*(fnAnim.value(i)) +   0.07f*(fnAnim.value(i + 1)));              fnAnim.setValue(i, tempValue, pAnimCache);        }        break;    case    4://三点钟形滤波        for (i = 2; i   < numKeys - 2; i++)        {            tempValue = 0.212f*fnAnim.value(i   - 1) + 0.576f*fnAnim.value(i) + 0.212*fnAnim.value(i + 1);            fnAnim.setValue(i, tempValue,   pAnimCache);        }        break;    default://五点汉明滤波        for (i = 2; i < numKeys - 2;   i++)        {            tempValue = 0.04f*(fnAnim.value(i   - 2) + fnAnim.value(i + 2)) + 0.24f*(fnAnim.value(i - 1) + fnAnim.value(i +   1)) + 0.44f*(fnAnim.value(i));              fnAnim.setValue(i, tempValue, pAnimCache);        }        break;    }      return stat;} MStatus SmoothAnimationCurveCmd::undoIt(){    if( pAnimCache != NULL )        pAnimCache -> undoIt();    return MS::kSuccess;} MStatus   SmoothAnimationCurveCmd::redoIt(){      if( pAnimCache != NULL )          pAnimCache -> redoIt();      return MS::kSuccess;} MStatus initializePlugin( MObject obj ){    MFnPlugin plugin( obj,   "Lulongfei", "1.0" );      MStatus stat;    stat =   plugin.registerCommand( "smoothAnimCurve",   SmoothAnimationCurveCmd::creator, SmoothAnimationCurveCmd::newSyntax );    if ( !stat )        stat.perror( "registerCommand   failed" );    return stat;}   MStatus uninitializePlugin( MObject obj ){      MFnPlugin plugin( obj );      MStatus stat;    stat =   plugin.deregisterCommand( "smoothAnimCurve" );    if ( !stat )        stat.perror( "deregisterCommand   failed" );    return   stat;}使用的时候mel用：smoothAnimCurve -md 0 -t "all" -it   1python用：cmds.smoothAnimCurve(md = 0, t = "all", it =   1)md为使用的方法，从0到5， it为迭代的次数，也就是你想进行几次光滑处理，type是类型，是“all”， 还是“select”。结果如下：    

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