meshOpCmd/meshOpCmd.cpp
 
 
 
meshOpCmd/meshOpCmd.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.
// ==========================================================================
//+

#include "meshOpCmd.h"
#include "meshOpNode.h"

// Function Sets
//
#include <maya/MFnDependencyNode.h>
#include <maya/MFnMesh.h>
#include <maya/MFnSingleIndexedComponent.h>

// Iterators
//
#include <maya/MItSelectionList.h>
#include <maya/MItMeshPolygon.h>

// General Includes
//
#include <maya/MGlobal.h>
#include <maya/MSelectionList.h>
#include <maya/MPlug.h>
#include <maya/MArgList.h>

#include <maya/MIOStream.h>

// Status Checking Macro - MCheckStatus (Debugging tool)
//
#define MCheckStatus(status,message)    \
        if( MS::kSuccess != status ) {          \
                cerr << message << "\n";                \
                return status;                                  \
        }


meshOp::meshOp()
//
//      Description:
//              meshOp constructor
//
{
        fOperation = (MeshOperation) 0;
}

meshOp::~meshOp()
//
//      Description:
//              meshOp destructor
//
{}

void* meshOp::creator()
//
//      Description:
//              this method exists to give Maya a way to create new objects
//      of this type. 
//
//      Return Value:
//              a new object of this type
//
{
        return new meshOp();
}

bool meshOp::isUndoable() const
//
//      Description:
//              this method tells Maya this command is undoable.  It is added to the 
//              undo queue if it is.
//
//      Return Value:
//              true if this command is undoable.
//
{
        return true;
}

MStatus meshOp::doIt( const MArgList& argList )
//
//      Description:
//              implements the MEL meshOp command.
//
//      Arguments:
//              argList - the argument list that was passes to the command from MEL
//
//      Return Value:
//              MS::kSuccess - command succeeded
//              MS::kFailure - command failed (returning this value will cause the 
//                     MEL script that is being run to terminate unless the
//                     error is caught using a "catch" statement.
//
{
        MStatus status;
        bool badArgument = false;

        // Only one parameter is expected to be passed to this command: the mesh
        // operation type. Get it, validate it or stop prematurely
        //
        if (argList.length() == 1)
        {
                int operationTypeArgument = argList.asInt(0);
                if (operationTypeArgument < 0
                        || operationTypeArgument > kMeshOperationCount - 1)
                {
                        badArgument = true;
                }
                else
                {
                        fOperation = (MeshOperation)operationTypeArgument;
                }
        }
        else badArgument = true;

        if (badArgument)
        {
                cerr << "Expecting one parameter: the operation type." << endl;
                cerr << "Valid types are: " << endl;
                cerr << "   0 - Subdivide edge(s)." << endl;
                cerr << "   1 - Subdivide face(s)." << endl;
                cerr << "   2 - Extrude edge(s)." << endl;
                cerr << "   3 - Extrude face(s)." << endl;
                cerr << "   4 - Collapse edge(s)." << endl;
                cerr << "   5 - Collapse face(s)." << endl;
                cerr << "   6 - Duplicate face(s)." << endl;
                cerr << "   7 - Extract face(s)." << endl;
                cerr << "   8 - Split face(s)." << endl;
                displayError(" Expecting one parameter: the operation type.");
                return MS::kFailure;
        }

        // Each mesh operation only supports one type of components
        // 
        MFn::Type componentType = meshOpFty::getExpectedComponentType(fOperation);

        // Parse the selection list for selected components of the right type.
        // To simplify things, we only take the first object that we find with
        // selected components and operate on that object alone.
        //
        // All other objects are ignored and return warning messages indicating
        // this limitation.
        //
        MSelectionList selList;
        MGlobal::getActiveSelectionList( selList );
        MItSelectionList selListIter( selList );
        selListIter.setFilter( MFn::kMesh );

        // The meshOperation node only accepts a component list input, so we build
        // a component list using MFnComponentListData.
        //
        // MIntArrays could also be passed into the node to represent the ids,
        // but are less storage efficient than component lists, since consecutive 
        // components are bundled into a single entry in component lists.
        //
        MFnComponentListData compListFn;
        compListFn.create();
        bool found = false;
        bool foundMultiple = false;

        for( ; !selListIter.isDone(); selListIter.next() )
        {
                MDagPath dagPath;
                MObject component;
                selListIter.getDagPath( dagPath, component );

                // Check for selected components of the right type
                //
                if( component.apiType() == componentType )
                {
                        if( !found )
                        {
                                // The variable 'component' holds all selected components 
                                // on the selected object, thus only a single call to 
                                // MFnComponentListData::add() is needed to store the selected
                                // components for a given object.
                                //
                                compListFn.add( component );

                                // Copy the component list created by MFnComponentListData
                                // into our local component list MObject member.
                                //
                                fComponentList = compListFn.object();

                                // Locally store the actual ids of the selected components so 
                                // that this command can directly modify the mesh in the case 
                                // when there is no history and history is turned off.
                                //
                                MFnSingleIndexedComponent compFn( component );

                                // Ensure that this DAG path will point to the shape 
                                // of our object. Set the DAG path for the polyModifierCmd.
                                //
                                dagPath.extendToShape();
                                setMeshNode( dagPath );
                                found = true;
                        }
                        else
                        {
                                // Break once we have found a multiple object holding 
                                // selected components, since we are not interested in how 
                                // many multiple objects there are, only the fact that there
                                // are multiple objects.
                                //
                                foundMultiple = true;
                                break;
                        }
                }
        }
        if( foundMultiple )
        {
                displayWarning("Found more than one object with selected components.");
                displayWarning("Only operating on first found object.");
        }

        // Initialize the polyModifierCmd node type - mesh node already set
        //
        setModifierNodeType( meshOpNode::id );

        if( found )
        {
                // Now, pass control over to the polyModifierCmd::doModifyPoly() method
                // to handle the operation.
                //
                status = doModifyPoly();
                
                if( status == MS::kSuccess )
                {
                        setResult( "meshOp command succeeded!" );
                }
                else
                {
                        displayError( "meshOp command failed!" );
                }
        }
        else
        {
                displayError(
                        "meshOp command failed: Unable to find selected components" );
                status = MS::kFailure;
        }
        
        return status;
}

MStatus meshOp::redoIt()
//
//      Description:
//              Implements redo for the MEL meshOp command. 
//
//              This method is called when the user has undone a command of this type
//              and then redoes it.  No arguments are passed in as all of the necessary
//              information is cached by the doIt method.
//
//      Return Value:
//              MS::kSuccess - command succeeded
//              MS::kFailure - redoIt failed.  this is a serious problem that will
//                     likely cause the undo queue to be purged
//
{
        MStatus status;

        // Process the polyModifierCmd
        //
        status = redoModifyPoly();

        if( status == MS::kSuccess )
        {
                setResult( "meshOp command succeeded!" );
        }
        else
        {
                displayError( "meshOp command failed!" );
        }

        return status;
}

MStatus meshOp::undoIt()
//
//      Description:
//              implements undo for the MEL meshOp command.  
//
//              This method is called to undo a previous command of this type.  The 
//              system should be returned to the exact state that it was it previous 
//              to this command being executed.  That includes the selection state.
//
//      Return Value:
//              MS::kSuccess - command succeeded
//              MS::kFailure - redoIt failed.  this is a serious problem that will
//                     likely cause the undo queue to be purged
//
{
        MStatus status;

        status = undoModifyPoly();

        if( status == MS::kSuccess )
        {
                setResult( "meshOp undo succeeded!" );
        }
        else
        {
                setResult( "meshOp undo failed!" );
        }
    
        return status;
}

MStatus meshOp::initModifierNode( MObject modifierNode )
{
        MStatus status;

        // We need to tell the meshOp node which components to operate on.
        // By overriding, the polyModifierCmd::initModifierNode() method,
        // we can insert our own modifierNode initialization code.
        //
        MFnDependencyNode depNodeFn( modifierNode );
        MObject cpListAttr = depNodeFn.attribute( "inputComponents" );

        // Pass the component list down to the meshOp node
        //
        MPlug cpListPlug( modifierNode, cpListAttr );
        status = cpListPlug.setValue( fComponentList );
        if (status != MS::kSuccess) return status;

        // Similarly for the operation type
        //
        MObject opTypeAttr = depNodeFn.attribute( "operationType" );
        MPlug opTypePlug( modifierNode, opTypeAttr );
        status = opTypePlug.setValue( fOperation );

        return status;
}

MStatus meshOp::directModifier( MObject mesh )
{
        MStatus status;

        fmeshOpFactory.setMesh( mesh );
        fmeshOpFactory.setComponentList( fComponentList );
        fmeshOpFactory.setComponentIDs( fComponentIDs );
        fmeshOpFactory.setMeshOperation( fOperation );

        // Now, perform the meshOp
        //
        status = fmeshOpFactory.doIt();

        return status;
}