bevy_elements 0.5.0

Living environments for Bevy: sun, moon and stars, climate-driven weather, GPU wind, volumetric clouds, rain, snow and fog, lightning, terrain with hydraulic and thermal erosion, flooding, snow cover, wetness and dust — simulated in compute shaders.
Documentation 
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// bevy_elements::terrain::common — the terrain grid's placement for shaders that read the packed
// `terrain_cells` buffer (wind solid mask, precipitation ground, ground extension, terrain and
// water materials).
//
//     import bevy_elements::grid::grid_taps;
//     import bevy_elements::terrain::common::{TerrainParams, terrain_live};
//
// `terrain_cells` is `array<vec4<f32>>`, one entry per cell, row-major: x surface height
// (bedrock + sediment, m above `misc.x`), y sediment depth (m), z water depth above the surface
// (m), w `bitcast<f32>(pack2x16float(∂h/∂x, ∂h/∂z))`. Sample it with `grid_taps(params.grid, xz)`
// and four loads; the world height is `misc.x + surface`.

import bevy_elements::grid::GridParams;

struct TerrainParams {
    grid: GridParams,
    // x: world height of a stored height of 0 (m). y: readback downsample factor.
    // z: 1 when a terrain is bound, 0 when the binding is a one-cell placeholder.
    misc: vec4<f32>,
}

fn terrain_live(params: TerrainParams) -> bool {
    return params.misc.z > 0.5;
}