foliage.shader

Vegetation that sways with the scene's wind.

The motion comes from the engine's frame-global wind (rendering.setWind), so every material reading it agrees on direction, speed and gust phase — a gust crosses a whole field instead of each plant animating on its own clock.

compliance scales how far this material yields — 1 for a grass blade, 0.1 for a trunk. The mesh's red vertex channel is how freely each vertex moves: 1 at a blade's tip, 0 at its root, so a blade pivots from its base. A mesh with no authored vertex colours reads white and sways as a whole.

The gust phase is a function of world position, so a gust travels across a field rather than every instance of the same mesh swaying in unison.

With no wind set the sway is zero and the surface renders as a plain lit material.