//-
// ==========================================================================
// Copyright (C) 1995 - 2005 Alias Systems Corp. and/or its licensors.  All 
// rights reserved. 
// 
// The coded instructions, statements, computer programs, and/or related 
// material (collectively the "Data") in these files are provided by Alias 
// Systems Corp. ("Alias") and/or its licensors for the exclusive use of the 
// Customer (as defined in the Alias Software License Agreement that 
// accompanies this Alias software). Such Customer has the right to use, 
// modify, and incorporate the Data into other products and to distribute such 
// products for use by end-users.
//  
// THE DATA IS PROVIDED "AS IS".  ALIAS HEREBY DISCLAIMS ALL WARRANTIES 
// RELATING TO THE DATA, INCLUDING, WITHOUT LIMITATION, ANY AND ALL EXPRESS OR 
// IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND/OR FITNESS FOR A 
// PARTICULAR PURPOSE. IN NO EVENT SHALL ALIAS BE LIABLE FOR ANY DAMAGES 
// WHATSOEVER, WHETHER DIRECT, INDIRECT, SPECIAL, OR PUNITIVE, WHETHER IN AN 
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, OR IN EQUITY, 
// ARISING OUT OF ACCESS TO, USE OF, OR RELIANCE UPON THE DATA.
// ==========================================================================
//+

// Example Plugin: lambertShader.cpp
//
// Produces dependency graph node LambertShader
// This node is an example of a Lambert shader and how to build a
// dependency node as a surface shader in Maya. The inputs for this node
// are many, and can be found in the Maya UI on the Attribute Editor for
// the node. The output attributes for the node are "outColor" and
// "outTransparency". To use this shader, create a lambertShader with
// Shading Group or connect the outputs to a Shading Group's
// "SurfaceShader" attribute.
//

#include <maya/MIOStream.h>
#include <maya/MPxNode.h>
#include <maya/MString.h>
#include <maya/MTypeId.h>
#include <maya/MPlug.h>
#include <maya/MDataBlock.h>
#include <maya/MDataHandle.h> 
#include <maya/MArrayDataHandle.h>
#include <maya/MFnNumericAttribute.h>
#include <maya/MFnLightDataAttribute.h> 
#include <maya/MFloatVector.h>
#include <maya/MFnPlugin.h>
#include <maya/MGlobal.h>


/////////////////////////////////
// Plugin Lambert Shader Class //
/////////////////////////////////


// This class will create a new shader. Shaders are custom dependency
// graph objects so we will derive this class from the basic DG node
// type MPxNode
//

class lambert : public MPxNode
{
public:
					lambert();
	virtual			~lambert();

	static  void *	creator();
	virtual MStatus	compute( const MPlug&, MDataBlock& );
	static  MStatus	initialize();


	// postConstructor:
	// The postConstructor method allows us to call MPxNode member
	// functions during initialization. Internally maya creates two
	// objects when a user defined node is created, the internal MObject
	// and the user derived object. The association between the these
	// two objects is not made until after the MPxNode constructor is
	// called. This implies that no MPxNode member function can be called
	// from the MPxNode constructor. The postConstructor will get called
	// immediately after the constructor when it is safe to call any
	// MPxNode member function.
	//

	virtual void	postConstructor(); 

	static  MTypeId   id;  // The IFF type id

protected:

   // Translucence coefficient 
   static MObject  aTranslucenceCoeff;

   // Diffuse Reflectivity
   static MObject  aDiffuseReflectivity;

   // Red component of surface color
   static MObject  aColorR;

   // Green component of surface color
   static MObject  aColorG;

   // Blue component of surface color
   static MObject  aColorB;

   // Surface color
   static MObject  aColor;

   // Red component of incandescence
   static MObject  aIncandescenceR;

   // Green component of incandescence
   static MObject  aIncandescenceG;

   // Blue component of incandescence
   static MObject  aIncandescenceB;

   // Incandescence
   static MObject  aIncandescence;

   // Red component of surface transparency
   static MObject  aInTransR;

   // Green component of surface transparency
   static MObject  aInTransG;

   // Blue component of surface transparency
   static MObject  aInTransB;

   // Surface transparency
   static MObject  aInTransparency;

   // Red component of output color
   static MObject  aOutColorR;

   // Green component of output color
   static MObject  aOutColorG;

   // Blue component of output color
   static MObject  aOutColorB;

   // Output color
   static MObject  aOutColor;

   // Red component of output transparency
   static MObject  aOutTransR;

   // Green component of output transparency
   static MObject  aOutTransG;

   // Blue component of output transparency
   static MObject  aOutTransB;

   // Output transparency
   static MObject  aOutTransparency;

   // X component of surface normal
   static MObject  aNormalCameraX;

   // Y component of surface normal
   static MObject  aNormalCameraY;

   // Z component of surface normal
   static MObject  aNormalCameraZ;

   // Surface normal
   static MObject  aNormalCamera;

   // X component of light direction vector
   static MObject  aLightDirectionX;

   // Y component of light direction vector
   static MObject  aLightDirectionY;

   // Z component of light direction vector
   static MObject  aLightDirectionZ;

   // Light direction vector
   static MObject  aLightDirection;

   // Red component of light intensity
   static MObject  aLightIntensityR;

   // Green component of light intensity
   static MObject  aLightIntensityG;

   // Blue component of light intensity
   static MObject  aLightIntensityB;

   // Light Intensity vector
   static MObject  aLightIntensity;

   // Ambient flag
   static MObject  aLightAmbient;

   // Diffuse flag
   static MObject  aLightDiffuse;

   // Specular flag
   static MObject  aLightSpecular;

   // Shadow Fraction flag
   static MObject	aLightShadowFraction;

   // Pre Shadow Intensity
   static MObject	aPreShadowIntensity;

   // Light blind data
   static MObject	aLightBlindData;

   // Light data array
   static MObject	aLightData;
 
};


// IFF type ID
// Each node requires a unique identifier which is used by
// MFnDependencyNode::create() to identify which node to create, and by
// the Maya file format. 
//
// For local testing of nodes you can use any identifier between
// 0x00000000 and 0x0007ffff, but for any node that you plan to use for
// more permanent purposes, you should get a universally unique id from
// Alias Support. You will be assigned a unique range that you
// can manage on your own. 
//
MTypeId lambert::id( 0x81000 );


// the postConstructor() function is called immediately after the objects
// constructor. It is not safe to call MPxNode member functions from the
// constructor, instead they should be called here.
//
void lambert::postConstructor( )
{
	// setMPSafe indicates that this shader can be used for multiprocessor
	// rendering. For a shading node to be MP safe, it cannot access any
	// shared global data and should only use attributes in the datablock
	// to get input data and store output data.
	//
	setMPSafe( true );
}


///////////////////////////////////////////////////////
// DESCRIPTION: attribute information
///////////////////////////////////////////////////////
//
MObject  lambert::aTranslucenceCoeff;
MObject  lambert::aDiffuseReflectivity;
MObject  lambert::aInTransparency;
MObject  lambert::aInTransR;
MObject  lambert::aInTransG;
MObject  lambert::aInTransB;
MObject  lambert::aColor;
MObject  lambert::aColorR;
MObject  lambert::aColorG;
MObject  lambert::aColorB;
MObject  lambert::aIncandescence;
MObject  lambert::aIncandescenceR;
MObject  lambert::aIncandescenceG;
MObject  lambert::aIncandescenceB;
MObject  lambert::aOutColor;
MObject  lambert::aOutColorR;
MObject  lambert::aOutColorG;
MObject  lambert::aOutColorB;
MObject  lambert::aOutTransparency;
MObject  lambert::aOutTransR;
MObject  lambert::aOutTransG;
MObject  lambert::aOutTransB;
MObject  lambert::aNormalCamera;
MObject  lambert::aNormalCameraX;
MObject  lambert::aNormalCameraY;
MObject  lambert::aNormalCameraZ;
MObject  lambert::aLightData;
MObject  lambert::aLightDirection;
MObject  lambert::aLightDirectionX;
MObject  lambert::aLightDirectionY;
MObject  lambert::aLightDirectionZ;
MObject  lambert::aLightIntensity; 
MObject  lambert::aLightIntensityR;
MObject  lambert::aLightIntensityG;
MObject  lambert::aLightIntensityB;
MObject  lambert::aLightAmbient;
MObject  lambert::aLightDiffuse;
MObject  lambert::aLightSpecular;
MObject  lambert::aLightShadowFraction;
MObject  lambert::aPreShadowIntensity;
MObject  lambert::aLightBlindData;


// This node does not need to perform any special actions on creation or
// destruction
//

lambert::lambert() { }
lambert::~lambert() { }


// The creator() method allows Maya to instantiate instances of this node.
// It is called every time a new instance of the node is requested by
// either the createNode command or the MFnDependencyNode::create()
// method. 
//
// In this case creator simply returns a new lambert object.
//

void* lambert::creator()
{
	return new lambert();
}


// The initialize method is called only once when the node is first
// registered with Maya. In this method you define the attributes of the
// node, what data comes in and goes out of the node that other nodes may
// want to connect to. 
//

MStatus lambert::initialize()
{
	MFnNumericAttribute nAttr; 
	MFnLightDataAttribute lAttr;

	MStatus status; // Status will be used to hold the MStatus value
					// returned by each api function call. It is important
					// to check the status returned by a call to aid in
					// debugging. Failed API calls can result in subtle 
					// errors that can be difficult to track down, you may
					// wish to use the CHECK_MSTATUS macro for any API
					// call where you do not need to provide your own
					// error handling.
					//

	// Attribute Initialization:
	//
	// create      - The create function creates a new attribute for the
	//				 node, it takes a long name for the attribute, a short
	//				 name for the attribute, the type of the attribute,
	//				 and a status object to determine if the api call was
	//				 successful.
	//
	// setKeyable  - Sets whether this attribute should accept keyframe
	//				 data, Attributes are not keyable by default.
	//
	// setStorable - Sets whether this attribute should be storable. If an
	//				 attribute is storable, then it will be writen out
	//				 when the node is stored to a file. Attributes are 
	//               storable by default.
	//
	// setDefault  - Sets the default value for this attribute.
	//
	// setUsedAsColor - Sets whether this attribute should be presented as
	//				 a color in the UI.
	//
	// setHidden   - Sets whether this attribute should be hidden from the
	//				 UI. This is useful if the attribute is being used for
	//				 blind data, or if it is being used as scratch space
	//				 for a geometry calculation (should also be marked
	//				 non-connectable in that case). Attributes are not
	//				 hidden by default.
	//
	// setReadable - Sets whether this attribute should be readable. If an
	//				 attribute is readable, then it can be used as the
	//				 source in a dependency graph connection. Attributes
	//				 are readable by default.
	//
	// setWritable - Sets whether this attribute should be readable. If an
	//				 attribute is writable, then it can be used as the
	//				 destination in a dependency graph connection. If an
	//			     attribute is not writable then setAttr commands will
	//				 fail to change the attribute. If both keyable and
	//				 writable for an attribute are set to true it will be
	//				 displayed in the channel box when the node is
	//				 selected. Attributes are writable by default.
	//
	// setArray    - Sets whether this attribute should have an array of
	//				 data. This should be set to true if the attribute
	//				 needs to accept multiple incoming connections.
	//				 Attributes are single elements by default.
	//


	// Input Attributes
	//
	aTranslucenceCoeff = nAttr.create( "translucenceCoeff", "tc",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );	
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f ) );

	aDiffuseReflectivity = nAttr.create( "diffuseReflectivity", "drfl",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.8f ) );

	aColorR = nAttr.create( "colorR", "cr",MFnNumericData::kFloat, 0,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f ) );

	aColorG = nAttr.create( "colorG", "cg", MFnNumericData::kFloat, 0,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.58824f ) );

	aColorB = nAttr.create( "colorB", "cb",MFnNumericData::kFloat, 0,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.644f ) );

	aColor = nAttr.create( "color", "c", aColorR, aColorG, aColorB,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f, 0.58824f, 0.644f ) );
	CHECK_MSTATUS( nAttr.setUsedAsColor( true ) );

	aIncandescenceR = nAttr.create( "incandescenceR", "ir",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f ) );

	aIncandescenceG = nAttr.create( "incandescenceG", "ig",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f ) );

	aIncandescenceB = nAttr.create( "incandescenceB", "ib",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status);
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f ) );

	aIncandescence = nAttr.create( "incandescence", "ic", aIncandescenceR,
			aIncandescenceG, aIncandescenceB, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f, 0.0f, 0.0f ) );
	CHECK_MSTATUS( nAttr.setUsedAsColor( true ) );

	aInTransR = nAttr.create( "transparencyR", "itr",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );

	aInTransG = nAttr.create( "transparencyG", "itg",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );

	aInTransB = nAttr.create( "transparencyB", "itb",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status);
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );

	aInTransparency = nAttr.create( "transparency", "it", aInTransR,
			aInTransG, aInTransB, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setKeyable( true ) );
	CHECK_MSTATUS( nAttr.setStorable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 0.0f, 0.0f, 0.0f ) );
	CHECK_MSTATUS( nAttr.setUsedAsColor( true ) );

	
	// Output Attributes
	//

	// Color Output
	//
	aOutColorR = nAttr.create( "outColorR", "ocr", MFnNumericData::kFloat,
			0, &status );
	CHECK_MSTATUS( status );
	
	aOutColorG = nAttr.create( "outColorG", "ocg", MFnNumericData::kFloat,
			0, &status );
	CHECK_MSTATUS( status );
	
	aOutColorB = nAttr.create( "outColorB", "ocb", MFnNumericData::kFloat,
			0, &status );
	CHECK_MSTATUS( status );
	
	aOutColor = nAttr.create( "outColor", "oc", aOutColorR, aOutColorG,
			aOutColorB, &status );
	CHECK_MSTATUS( status );
	
	CHECK_MSTATUS( nAttr.setHidden( false ) );
	CHECK_MSTATUS( nAttr.setReadable( true ) );
	CHECK_MSTATUS( nAttr.setWritable( false ) );

	
	// Transparency Output
	//
	aOutTransR = nAttr.create( "outTransparencyR", "otr",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );

	aOutTransG = nAttr.create( "outTransparencyG", "otg",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );

	aOutTransB = nAttr.create( "outTransparencyB", "otb",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );

	aOutTransparency = nAttr.create( "outTransparency", "ot",
			aOutTransR,aOutTransG,aOutTransB, &status );
	CHECK_MSTATUS( status );

	CHECK_MSTATUS( nAttr.setHidden( false ) );
	CHECK_MSTATUS( nAttr.setReadable( true ) );
	CHECK_MSTATUS( nAttr.setWritable( false ) );


	// Camera Normals
	//
	aNormalCameraX = nAttr.create( "normalCameraX", "nx",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aNormalCameraY = nAttr.create( "normalCameraY", "ny",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aNormalCameraZ = nAttr.create( "normalCameraZ", "nz",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aNormalCamera = nAttr.create( "normalCamera","n", aNormalCameraX,
			aNormalCameraY, aNormalCameraZ, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f, 1.0f, 1.0f ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );


	// Light Direction
	//
	aLightDirectionX = nAttr.create( "lightDirectionX", "ldx",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightDirectionY = nAttr.create( "lightDirectionY", "ldy",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightDirectionZ = nAttr.create( "lightDirectionZ", "ldz",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightDirection = nAttr.create( "lightDirection", "ld",
			aLightDirectionX, aLightDirectionY, aLightDirectionZ,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f, 1.0f, 1.0f ) );


	// Light Intensity
	//
	aLightIntensityR = nAttr.create( "lightIntensityR", "lir",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightIntensityG = nAttr.create( "lightIntensityG", "lig",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightIntensityB = nAttr.create( "lightIntensityB", "lib",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightIntensity = nAttr.create( "lightIntensity", "li", 
			aLightIntensityR, aLightIntensityG, aLightIntensityB,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f, 1.0f, 1.0f ) );

   
	// Light
	//
	aLightAmbient = nAttr.create( "lightAmbient", "la",
			MFnNumericData::kBoolean, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( true ) );

	aLightDiffuse = nAttr.create( "lightDiffuse", "ldf",
			MFnNumericData::kBoolean, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( true ) );

	aLightSpecular = nAttr.create( "lightSpecular", "ls",
			MFnNumericData::kBoolean, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( false ) );

	aLightShadowFraction = nAttr.create( "lightShadowFraction", "lsf",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setReadable( true ) );
	CHECK_MSTATUS( nAttr.setWritable( true ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aPreShadowIntensity = nAttr.create( "preShadowIntensity", "psi",
			MFnNumericData::kFloat, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 1.0f ) );

	aLightBlindData = nAttr.create( "lightBlindData", "lbld",
			MFnNumericData::kLong, 0, &status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( nAttr.setStorable( false ) );
	CHECK_MSTATUS( nAttr.setHidden( true ) );
	CHECK_MSTATUS( nAttr.setReadable( false ) );
	CHECK_MSTATUS( nAttr.setDefault( 0 ) );

	aLightData = lAttr.create( "lightDataArray", "ltd", aLightDirection,
			aLightIntensity, aLightAmbient, aLightDiffuse, aLightSpecular, 
			aLightShadowFraction, aPreShadowIntensity, aLightBlindData,
			&status );
	CHECK_MSTATUS( status );
	CHECK_MSTATUS( lAttr.setArray( true ) );
	CHECK_MSTATUS( lAttr.setStorable( false ) );
	CHECK_MSTATUS( lAttr.setHidden( true ) );
	CHECK_MSTATUS( lAttr.setDefault( 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
			true, true, false, 1.0f, 1.0f, 0 ) );


	// Next we will add the attributes we have defined to the node
	//
	CHECK_MSTATUS( addAttribute( aTranslucenceCoeff ) );
	CHECK_MSTATUS( addAttribute( aDiffuseReflectivity ) );
	CHECK_MSTATUS( addAttribute( aColor ) );
	CHECK_MSTATUS( addAttribute( aIncandescence ) );
	CHECK_MSTATUS( addAttribute( aInTransparency ) );
	CHECK_MSTATUS( addAttribute( aOutColor ) );
	CHECK_MSTATUS( addAttribute( aOutTransparency ) );
	CHECK_MSTATUS( addAttribute( aNormalCamera ) );

	// Only add the parent of the compound
	CHECK_MSTATUS( addAttribute( aLightData ) );

	// The attributeAffects() method is used to indicate when the input
	// attribute affects the output attribute. This knowledge allows Maya
	// to optimize dependencies in the graph in more complex nodes where
	// there may be several inputs and outputs, but not all the inputs
	// affect all the outputs.
	//
	CHECK_MSTATUS( attributeAffects( aTranslucenceCoeff, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aDiffuseReflectivity, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aColorR, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aColorG, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aColorB, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aColor, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aInTransR, aOutTransparency ) );
	CHECK_MSTATUS( attributeAffects( aInTransG, aOutTransparency ) );
	CHECK_MSTATUS( attributeAffects( aInTransB, aOutTransparency ) );
	CHECK_MSTATUS( attributeAffects( aInTransparency, aOutTransparency ) );
	CHECK_MSTATUS( attributeAffects( aInTransparency, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aIncandescenceR, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aIncandescenceG, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aIncandescenceB, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aIncandescence, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightIntensityR, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightIntensityB, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightIntensityG, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightIntensity, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aNormalCameraX, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aNormalCameraY, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aNormalCameraZ, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aNormalCamera, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightDirectionX, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightDirectionY, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightDirectionZ, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightDirection, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightAmbient, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightSpecular, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightDiffuse, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightShadowFraction, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aPreShadowIntensity, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightBlindData, aOutColor ) );
	CHECK_MSTATUS( attributeAffects( aLightData, aOutColor ) );

	return( MS::kSuccess );
}


// The compute() method does the actual work of the node using the inputs
// of the node to generate its output. 
//
// Compute takes two parameters: plug and data.
// - Plug is the the data value that needs to be recomputed
// - Data provides handles to all of the nodes attributes, only these
//   handles should be used when performing computations.
//
MStatus lambert::compute( const MPlug& plug, MDataBlock& block ) 
{ 
	// The plug parameter will allow us to determine which output attribute
	// needs to be calculated.
	//
	if( plug == aOutColor
			|| plug == aOutColorR
			|| plug == aOutColorG
			|| plug == aOutColorB
			|| plug == aOutTransparency
			|| plug == aOutTransR
			|| plug == aOutTransG
			|| plug == aOutTransB )
	{
		MStatus status;
		MFloatVector resultColor( 0.0, 0.0, 0.0 ); 

	
		// Get surface shading parameters from input block
		//
		MFloatVector& surfaceNormal = block.inputValue( aNormalCamera,
				&status ).asFloatVector();
		CHECK_MSTATUS( status );

		MFloatVector& surfaceColor = block.inputValue( aColor,
				&status ).asFloatVector();
		CHECK_MSTATUS( status );

		MFloatVector& incandescence = block.inputValue( aIncandescence,
				&status ).asFloatVector();
		CHECK_MSTATUS( status );

		float diffuseReflectivity = block.inputValue(
				aDiffuseReflectivity, &status ).asFloat();
		CHECK_MSTATUS( status );
	
// 		float translucenceCoeff = block.inputValue( aTranslucenceCoeff,
// 				&status ).asFloat();
// 		CHECK_MSTATUS( status );
  

		// Get light list
		//
		MArrayDataHandle lightData = block.inputArrayValue( aLightData,
				&status );
		CHECK_MSTATUS( status );

		int numLights = lightData.elementCount( &status );
		CHECK_MSTATUS( status );


		// Calculate the effect of the lights in the scene on the color
		//

		// Iterate through light list and get ambient/diffuse values
		//
		for( int count=1; count <= numLights; count++ )
		{
			// Get the current light out of the array
			//
			MDataHandle currentLight = lightData.inputValue( &status ); 
			CHECK_MSTATUS( status );


			// Get the intensity of that light
			//
			MFloatVector& lightIntensity = currentLight.child(
					aLightIntensity ).asFloatVector();

	 
			// Find ambient component
			//
			if ( currentLight.child( aLightAmbient ).asBool() )
			{
				resultColor += lightIntensity;
			}


			// Find diffuse component
			//
			if ( currentLight.child( aLightDiffuse ).asBool() )
			{
				MFloatVector& lightDirection = currentLight.child(
						aLightDirection ).asFloatVector();
				float cosln = lightDirection * surfaceNormal;
   
			   if ( cosln > 0.0f ) {
					resultColor += lightIntensity
							* ( cosln * diffuseReflectivity );
			   }
			}


			// Advance to the next light.
			//
			if ( count < numLights ) {
				status = lightData.next();
				CHECK_MSTATUS( status );
			}
		}


		// Factor incident light with surface color and add incandescence
		//
		resultColor[0] = resultColor[0] * surfaceColor[0] + incandescence[0];
		resultColor[1] = resultColor[1] * surfaceColor[1] + incandescence[1];
		resultColor[2] = resultColor[2] * surfaceColor[2] + incandescence[2];


		// Set ouput color attribute
		//
		if ( plug == aOutColor || plug == aOutColorR || plug == aOutColorG
				|| plug == aOutColorB)
		{
			// Get the handle to the attribute
			//
			MDataHandle outColorHandle = block.outputValue( aOutColor,
					&status );
			CHECK_MSTATUS( status );
			MFloatVector& outColor = outColorHandle.asFloatVector();
		
			outColor = resultColor;		// Set the output value
			outColorHandle.setClean(); // Mark the output value as clean
		}


		// Set ouput transparency
		//
		if ( plug == aOutTransparency || plug == aOutTransR
				|| plug == aOutTransG || plug == aOutTransB )
		{
			MFloatVector& transparency = block.inputValue(
					aInTransparency, &status ).asFloatVector();
			CHECK_MSTATUS( status );


			// Get the handle to the attribute
			//
			MDataHandle outTransHandle = block.outputValue(
					aOutTransparency, &status );
			CHECK_MSTATUS( status );
			MFloatVector& outTrans = outTransHandle.asFloatVector();
			
			outTrans = transparency;   // Set the output value
			outTransHandle.setClean(); // Mark the output value as clean
		}
	} 
	else
	{
		return( MS::kUnknownParameter ); // We got an unexpected plug
	}

	return( MS::kSuccess );
}


// These methods load and unload the plugin, registerNode registers the
// new node type with maya
//

MStatus initializePlugin( MObject obj )
{ 
	const MString	UserClassify( "shader/surface" );

	MString command( "if( `window -exists createRenderNodeWindow` ) {refreshCreateRenderNodeWindow(\"" );

	MFnPlugin plugin( obj, "Alias", "4.5", "Any" );

	CHECK_MSTATUS( plugin.registerNode( "lambertShader", lambert::id, 
			lambert::creator, lambert::initialize, MPxNode::kDependNode,
			&UserClassify ) );

   command += UserClassify;
   
   command += "\");}\n";

   CHECK_MSTATUS( MGlobal::executeCommand( command ) );

   return( MS::kSuccess );
}

MStatus uninitializePlugin( MObject obj )
{
	const MString UserClassify( "shader/surface" );

	MString command( "if( `window -exists createRenderNodeWindow` ) {refreshCreateRenderNodeWindow(\"" );

	MFnPlugin plugin( obj );
   
	CHECK_MSTATUS( plugin.deregisterNode( lambert::id ) );

	command += UserClassify;
	command += "\");}\n";

	CHECK_MSTATUS( MGlobal::executeCommand( command ) );

	return MS::kSuccess;
}