hexglobe 0.1.3

Library to generate hexagonal tessellations of a sphere quickly and accurately.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

use bevy::{
    prelude::*,
    render::{
        mesh::Indices,
        render_asset::RenderAssetUsages,
        render_resource::PrimitiveTopology,
    },
};
use bevy_panorbit_camera::{PanOrbitCamera, PanOrbitCameraPlugin};
use hexglobe::projection::globe::ExactGlobe;

fn main() {
    App::new()
        .add_plugins((
            DefaultPlugins,
            PanOrbitCameraPlugin
        ))
        .add_systems(Startup, setup)
        .add_systems(Update, draw_debug)
        .run();
}

fn setup(
    mut commands: Commands,
    mut materials: ResMut<Assets<StandardMaterial>>,
    mut meshes: ResMut<Assets<Mesh>>,
) {
    // Create and save a handle to the mesh.
    let mesh_handle: Handle<Mesh> = meshes.add(create_mesh());
    
    // Render the mesh with the custom texture, and add the marker.
    commands.spawn((
        Mesh3d(mesh_handle),
        MeshMaterial3d(materials.add(Color::WHITE)),
    ));
    
    commands.spawn((
        PointLight {
            shadows_enabled: true,
            ..default()
        },
        Transform::from_xyz(4.0, 8.0, 4.0),
    ));
    // camera
    commands.spawn((
        Camera3d::default(),
        PanOrbitCamera::default(),
        Transform::from_xyz(0.0, 0.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
    ));
}

fn draw_debug(
    mut gizmos: Gizmos
) {
    /*
    x - red
    y - green
    z - blue
    */
    gizmos.axes(
        Transform::IDENTITY,
        2.0
    );
}

fn create_mesh() -> Mesh {
    let globe = ExactGlobe::<3>::new();
    let centroids = globe.centroids(None);
    let vertices = globe.mesh_vertices(&centroids);
    let faces = globe.mesh_faces();
    let triangles = globe.mesh_triangles(&faces);
    let normals = globe.mesh_normals(&vertices);
    
    Mesh::new(PrimitiveTopology::TriangleList, RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD)
        .with_inserted_attribute(
            Mesh::ATTRIBUTE_POSITION,
            vertices
        )
        .with_inserted_indices(Indices::U32(
            triangles
        ))
        .with_inserted_attribute(
            Mesh::ATTRIBUTE_NORMAL,
            normals
        )
}