Helps us create beautiful scenes.
The first picture is "Shadowmask" (the default and the VRChat currently used). There is a problem with rendering shadows. The terrain has insufficient shadow map resolution, and shadows are not visible. Furthermore, the car is on the border of shadow, but the entire car is dark.
The second picture is "Distance Shadowmask." This uses a mix of baked and real-time shadows, and the problem with rendering shadows has been improved. Also, the LightMap is used in the distance, which also improves performance.