Windy Grass

This movie simulates a field of grass.

Each blade of grass is modeled using two points - a midpoint (cx,cy) and an end point (ex,ey).

Each individual point is moved using a random vector (turbulence).

An additional 'global' vector is used to move all the grass together (wind).

Although simple, this is *not* a particularly realistic wind model, and you'll find that by tweaking the sliders you can make it look pretty odd.