源代码：
from PIL import Image
import numpy as np
vec_el=np.pi/2.2
vec_az=np.pi/4
depth=10
im=Image.open("D:/视频源/graphics/python/aniya.jpg").convert("L")
a=np.asarray(im).astype("float")
grad=np.gradient(a)
grad_x,grad_y=grad
grad_x=grad_x*depth/100
grad_y=grad_y*depth/100
dx=np.cos(vec_el)*np.cos(vec_az)
dy=np.cos(vec_el)*np.sin(vec_az)
dz=np.sin(vec_el)
A=np.sqrt(grad_x**2+grad_y**2+1)
uni_x=grad_x/A
uni_y=grad_y/A
uni_z=1/A
a2=255*(dx*uni_x+dy*uni_y+dz*uni_z)
a2=a2.clip(0,255)
im2=Image.fromarray(a2,np.astype("uint8"))
im2.save("draw_aniya.jpg")
