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*.