Rotate 3 locations on 0-90 graus

[mystic jungle]

i had asked this before, but I still couldn't solve it,
how do I rotate a cube 90/360 ? in this example:

in this example: it is rotated at 0 degrees, and it has red dots on the corner of the cube, this is easy to catch when it comes to 0 degrees,

[mystic jungle]

i have this cube, on 0 graus

now, it is rotating 45 degrees, in which case I don't know how I can get these corners anymore, since add(0, 5, 0) won't work to get the corners, I used rotateAroundAxisY but I don't know how it would fit very good

in this case i tried use #rotateAroundY method