[2024] Creative experiments on phase changes have yielded mixed results.

There are several ways that Ices can melt in the game:
1. They are in an atmosphere and they are above their freezing temperature
2. They are in direct sunlight

We doing a multi-threaded custom simulation and voxel raycast for sunlight, for performance reasons. This means that there is a chance* that if Ice is on the terrain, the voxel may be filled enough that if the ice is in the right place it might not be considered accessible to the sun.