Pointcloud is flipped left-right when using depth values from pybullet

Question

I used pybullet to get depth data of an object. I converted the depth buffer into a numpy array and then reshaped it to 500x500 which is size of my image. To convert it to pointcloud, I use open3d -

for x in range(real_depth.shape[0]):
    for y in range(real_depth.shape[1]):
       zi = real_depth[x][y]
       xi = ((float(x))-250)/144
       yi = ((float(y))-250)/144
       vertices.append((xi, yi, zi))

When I do this, the pointcloud I get is flipped horizontally. Everything Can someone tell me why is it happening? Correct image - Flipped image - I get the correct pcd when I flip my depth array left-right.