A ground coordinate stores the pointer location after the screen-space mouse
position has been projected onto the flat terrain. Keeping a simple
two-dimensional structure here makes it easier to test the wind logic without
having to create Three.js objects in every unit test.
A ground coordinate stores the pointer location after the screen-space mouse position has been projected onto the flat terrain. Keeping a simple two-dimensional structure here makes it easier to test the wind logic without having to create Three.js objects in every unit test.