Re: How to Hair to curves?

[Guillaume Laforge <guillaume(at)alamaison.fr>]

Happy 2008 !

Select your hair object and run. It creates one curve by guide.
If you need to merge some of the curves, you will need an other script ( I send it to the list some time ago). 

//***************************************
var xHair = Selection(0);

HairPointsValues( xHair )


function HairPointsValues( xHair )
{
		
	var PointsPerGuideHair = 14 ; // This is always true
	var valuesPerPosition = 3 ; // x,y,z
	var gHair = xHair.ActivePrimitive.Geometry;
	var aAllPositions = gHair.Points.PositionArray.toArray();

	var cntGuideHairs = aAllPositions.length / ( valuesPerPosition * PointsPerGuideHair ) ;
	var oMesh = HairPolymesh(xHair); 
	var oPoints = oMesh.Geometry.Points;

	for ( i = 0 ; i < cntGuideHairs ; i++ )
	{
		var posArray = new Array();
		
		var oHairRootx = oPoints.item(i).position.x;
		var oHairRooty = oPoints.item(i).position.y;
		var oHairRootz = oPoints.item(i).position.z;
		
		logmessage("guide n : "+i);

		posArray.push(oHairRootx);
		posArray.push(oHairRooty);
		posArray.push(oHairRootz);
		posArray.push(1);

		indexHairRoot = i * valuesPerPosition * PointsPerGuideHair ;
		
		
		
		for ( k = 0 ; k < PointsPerGuideHair ; k++ )
		{					
			xIndex = k*valuesPerPosition + indexHairRoot ;
			posArray.push( aAllPositions[xIndex ]);
			posArray.push( aAllPositions[xIndex + 1]);
			posArray.push( aAllPositions[xIndex + 2]);
			posArray.push( 1 );
		}
		var degrees = [1];
		var params = [siUniformParameterization];
		var closed = [false];
		var initCurve = ActivesceneRoot.AddNurbsCurveList2(1, posArray, null, null, null, closed, degrees, params, siSINurbs, "LinesFromGuides" );
	}


// return the geometry source
function HairPolymesh(HairObject)
{
	//Find the hair operator.
	oEnum = new Enumerator( HairObject.ActivePrimitive.ConstructionHistory );
	for (;!oEnum.atEnd();oEnum.moveNext())
	{
		if( oEnum.item().name == "Hair Generator Operator" )
		{
			oOp = oEnum.item();
			oEnumInPort = new Enumerator( oOp.InputPorts ) ;
			for (;!oEnumInPort.atEnd();oEnumInPort.moveNext() )
			{
				var oInPort = oEnumInPort.item () ;
				if(oInPort.GroupName == "Group_0")
				{
					var oMesh = oInPort.Target2;
					return oMesh;
				}
			}
		}
	}
}

//***********************************************

Cheers !

--
Guillaume Laforge | La Maison

PS : If you use Linux you must add those line before the script :

// Add a push method to the JScript Array Object
// (at)cc_on
// (at)if ((at)_jscript_version < 5.5)
var push = function(){
	for( var i = 0; arguments[ i ] != null; i++ )
		this[this.length++] = arguments[ i ];
	return( this );
	}
Array.prototype.push = push;
// (at)end



On Thu, 3 Jan 2008 15:19:13 -0500, "Marc-Andre Carbonneau" <marc-andre.carbonneau(at)ubisoft.com> wrote:
> Heya!
> 
>  
> 
> First, Happy New Year! Wish you all the best for 2008. Lots of exciting
> projects for you all I'm sure!
> 
>  
> 
> My TD is still on holyday so could anyone help me convert hair to
> curves? Anyone wrote such a script or plu


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