摘要:本文将带你了解Maya教程之Maya API转换curve为螺旋曲线,希望本文对大家学Maya有所帮助
本文将带你了解Maya教程之Maya API转换curve为螺旋曲线,希望本文对大家学Maya有所帮助
创建一条curve,输入命令,使其转会为螺旋曲线
#include <stdio.h>
#include <math.h>
#include <maya/MFnPlugin.h>
#include <maya/MFnNurbsCurve.h>
#include <maya/MPointArray.h>
#include <maya/MDoubleArray.h>
#include <maya/MPoint.h>
#include <maya/MSelectionList.h>
#include <maya/MItSelectionList.h>
#include <maya/MItCurveCV.h>
#include <maya/MGlobal.h>
#include <maya/MDagPath.h>
#include <maya/MString.h>
#include <maya/MPxCommand.h>
#include <maya/MArgList.h>
class helix2 : public MPxCommand
{
public:
helix2();
virtual ~helix2();
MStatus doIt( const MArgList& args );
MStatus redoIt();
MStatus undoIt();
bool isUndoable() ;
static void * creator();
private:
MDagPath fdagPath;
MPointArray fCVs;
double radius;
double pitch;
};
void *helix2::creator()
{
return new helix2;
}
helix2::helix2():radius(4.0),pitch(0.5){}
helix2::~helix2(){}
MStatus helix2::doIt( const MArgList& args )
{
MStatus status;
int i ;
for ( i = 0 ; i< args.length(); i++)
if (MString("-p") == args.asString(i,&status)&&MS::kSuccess == status)
{
double tmp = args.asDouble(++i,&status);
if(MS::kSuccess == status)
pitch = tmp;
}
else if (MString("-r") == args.asString(i,&status)&&MS::kSuccess == status)
{
double tmp = args.asDouble(++i,&status);
if(MS::kSuccess == status )
pitch = tmp;
}
else
{
MString msg = "Invalid flag: ";
msg += args.asString(i);
displayError(msg);
return MS::kSuccess;
}
MSelectionList slist;
MGlobal::getActiveSelectionList(slist);
MItSelectionList list(slist,MFn::kNurbsCurve,&status);
if(MS::kSuccess != status )
{
displayError("Could not create selection list iterator");
return status;
}
if(list.isDone())
{
displayError("No curve selected");
return MS::kFailure;
}
MObject component;
list.getDagPath(fdagPath,component);
return redoIt();
}
MStatus helix2::redoIt()
{
unsigned i,numCVs;
MStatus status;
MFnNurbsCurve curveFn(fdagPath);
numCVs = curveFn.numCVs();
status = curveFn.getCVs(fCVs);
if (MS::kSuccess != status )
{
displayError("Could not get curve`s CVs");
return MS::kFailure;
}
MPointArray points(fCVs);
for(i=0;i<numCVs;i++)
points[i] = MPoint(radius*cos((double )i),pitch*(double)i,radius*sin((double)i));
status = curveFn.setCVs(points);
if (MS::kSuccess != status)
{
displayError("Could not set new CV infomation");
fCVs.clear();
return status;
}
status = curveFn.updateCurve();
if(MS::kSuccess!=status)
{
displayError("Could not update curve");
return status;
}
return MS::kSuccess;
}
MStatus helix2::undoIt()
{
MStatus status;
MFnNurbsCurve curveFn(fdagPath);
status = curveFn.setCVs(fCVs);
if(MS::kSuccess!=status)
{
displayError("Could not set old CV information");
return status;
}
status = curveFn.updateCurve();
if(MS::kSuccess!=status)
{
displayError("Could not update curve");
return status;
}
return MS::kSuccess;
}
MStatus initializePlugin(MObject obj)
{
MFnPlugin plugin(obj,"lijy","1.0","any");
plugin.registerCommand("helix2",helix2::creator);
return MS::kSuccess;
}
MStatus uninitializePlugin(MObject obj)
{
MFnPlugin plugin(obj);
plugin.deregisterCommand("helix2");
return MS::kSuccess;
}
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