var interpolant = new THREE.[name](
		new Float32Array( 2 ),
		new Float32Array( 2 ),
		1,
		new Float32Array( 1 )
);
interpolant.evaluate( 0.5 );
		
		
		parameterPositions -- array of positions
		sampleValues -- array of samples
		sampleSize -- number of samples
		resultBuffer -- buffer to store the interpolation results.
		
Evaluate the interpolant at position *t*.
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]