def deflectomotery(objectName, imgDir):
Img = Image(imgDir, objectName)
Gradient_V = setGrad(Img.imgVSet, 3.8)
Gradient_H = setGrad(Img.imgHSet, 3.8)
#cv2.imwrite(os.path.join(imgDir, 'GradV.png'), np.array(Gradient_V * 255, dtype=np.uint8))
#cv2.imwrite(os.path.join(imgDir, 'GradH.png'), np.array(Gradient_H * 255, dtype=np.uint8))
N = np.zeros((Img.height, Img.width, 3), dtype=Img.PRECISION_IMG)
N[..., 0] = -Gradient_V / np.sqrt(np.square(Gradient_V) + np.square(Gradient_H) + 1)
N[..., 1] = -Gradient_H / np.sqrt(np.square(Gradient_V) + np.square(Gradient_H) + 1)
N[..., 2] = 1 / np.sqrt(np.square(Gradient_V) + np.square(Gradient_H) + 1)
# crop valid region
Ncrop = N[Img.mask[0]:Img.mask[2], Img.mask[1]:Img.mask[3]]
A = Img.A[Img.mask[0]:Img.mask[2], Img.mask[1]:Img.mask[3]]
[newHeight, newWidth, _] = A.shape
Nfname = os.path.join(imgDir, 'normal.png')
# xyz to zyx because of OPENCV BGR order
cv2.imwrite(Nfname, cv2.cvtColor(np.array((Ncrop + 1) / 2.0 * 255, dtype=np.uint8), cv2.COLOR_RGB2BGR))
mesh = Mesh(objectName, newHeight, newWidth, Img.mask)
mesh.setNormal(N)
mesh.setDepth()
mesh.setTexture(A)
mesh.exportOBJ(imgDir, True)
