title: How to get the heights(altitudes) information of the map in Pybullet?
body: <p>I am looking for a function or something to get the heights(altitudes) of the map(near the robot). It should be a 2-D matrix with heights(altitudes) as each element. I want to use the matrix to represent the geographic information which the robot is in. Is there any solution to do that? Thanks for answering!</p>