javascript - How can I rotate a mesh by 90 degrees in ThreeJS? -

i have mesh want rotate 90 degrees inside 3 js. here image of current situation:

i want selected mesh rotated parallelly large mesh. have tried rotating matrix this:

matrix =   new three.matrix4().makerotationx(1.57) 

but mesh goes strange rotations. there easier way rotate 90 degrees ?

the threejs rotation uses radians (as might know)

you can use this

mesh.rotation.x = math.pi / 2; 

or

mesh.rotation.set(new three.vector3( 0, 0, math.pi / 2));