Wind¶
The Wind module pushes its settings to global shader values every frame. Wind is authored in real units: metres, seconds, degrees, and fractions of plant height.
Direction is in degrees, measured the way the wind blows toward: 0° = +X (east),
90° = +Z (north). The header shows it as a compass point, for example 0.24 toward NE.
Select the Wind object to see an arrow in the Scene view: solid for the breeze, thin for
gusts when they travel a different way.
PRESETS¶
Four buttons, Calm, Breeze, Windy and Storm, write a starting set of breeze and gust values into the current Wind asset. They overwrite those values; Undo reverts them.
BREEZE¶
A noise field of patches travels along the wind. Blades lean by Strength on average and rock around that lean as the patches pass.
| Setting | What it does | Default | Shipped preset |
|---|---|---|---|
| Direction (°) | Which way the wind blows. The N / NE / E / SE / S / SW / W / NW buttons below it set it in one click. | 45 | 54 |
| Strength | Mean lean, as a fraction of plant height. 0.1 is gentle, 0.5 storm-bent. | 0.18 | 0.237 |
| Sway | How far blades rock around the mean lean as breeze patches pass. 0 is a frozen lean. | 0.6 | 0.993 |
| Wave Size (m) | Size of a breeze patch. Small shimmers, large gives broad swells. | 12 | 1 |
| Wave Speed (m/s) | How fast the breeze patches travel across the field. | 3 | 3 |
| Noise Type (MORE) | Noise behind the breeze patches: Perlin, Simplex, Value or Voronoi. | Perlin | Value |
GUSTS¶
Gusts are fronts of extra push that roll through on a timer: a ragged band passing every Interval seconds. Each blade is hit fast and settles back slowly, so every front leaves a wake of bent grass behind it.
| Setting | What it does | Default | Shipped preset |
|---|---|---|---|
| Strength | Extra push at the peak of a front, as a fraction of plant height. 0 disables gusts. | 0.25 | 0.5 |
| Interval (s) | Seconds between fronts. | 6 | 7 |
| Front Speed (m/s) | How fast a front travels. | 7 | 6 |
| Front Width (m) | Depth of the gust band: how much field is pushed at once. | 8 | 8 |
| Recover Time (s) | How long grass takes to stand back up after a front has passed. Never shorter than the front takes to pass. | 2 | 2 |
| Follow Wind Direction | Gusts travel the same way as the breeze. | On | On |
| Direction (°) | Gust direction, shown when Follow Wind Direction is off. | 90 | 360 |
| Noise Type (MORE) | Noise that makes the fronts ragged and varies their strength. | Simplex | Voronoi |
Changing the wind direction rebuilds every grass patch in the editor, because blade facing is baked from the wind at build time.