Q: All values are 0 after performing the 3D slope analysis for the terrain data added to the scene. Why did this happen?

A: Firstly, add the terrain data to the map, use the grid query function to check if the slope value of the data is 0. If it is 0, the data itself has errors. If it is not 0, the reason is that the 3D display system of the computer is not discrete graphics card by default. Please check the 3D display system of the computer and set the NVIDIA Graphics for the default 3D display via Computer—Management--Device Management--Display System.