该方法将两个4x4矩阵相乘并返回结果矩阵。
multiplyMatrices( matrixA, matrixB )
var matrix1 = new THREE.Matrix4();
var matrix2 = new THREE.Matrix4();
matrix1.makeRotationX( Math.PI / 4 );
matrix2.makeRotationY( Math.PI / 4 );
var resultMatrix = new THREE.Matrix4().multiplyMatrices( matrix1, matrix2 );