[Python] rotate an nxnxn matrix in python

I have a binary array of size 64x64x64, where a volume of 40x40x40 is set to "1" and rest is "0". I have been trying to rotate this cube about its center around z-axis using skimage.transform.rotate and also Opencv as:

def rotateImage(image, angle):
row, col = image.shape
center = tuple(np.array([row, col]) / 2)
rot_mat = cv2.getRotationMatrix2D(center, angle, 1.0)
new_image = cv2.warpAffine(image, rot_mat, (col, row))
return new_image


In the case of openCV, I tried, 2D rotation of each idividual slices in a cube (Cube[:,:,n=1,2,3...p]).

After rotating, total sum of the values in the array changes. This may be caused by interpolation during rotation. How can I rotate 3D array of this kind without adding anything to the array?

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