maple 0.4.0

A 3D game engine
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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224

use std::f32::consts::PI;

use maple::prelude::*;

fn main() {
    App::new(Config {
        ..Default::default()
    })
    .add_plugin(Core3D)
    .add_plugin(Physics3D)
    .load_scene(player)
    .load_scene(playground)
    .run();
}

const WALK_SPEED: f32 = 5.0;
const SPRINT_SPEED: f32 = 10.0;
const JUMP_SPEED: f32 = 5.0;

const BOTTOM: f32 = -10.0;

fn player(assets: &AssetLibrary) -> Scene {
    let scene = Scene::default();

    // character controller for handleing movements within the scene
    let controller = scene.spawn(
        CharacterController::builder()
            // just above ground
            .position((0.0, -3.45, 0.0))
            .no_snap_to_ground()
            .slide(true)
            .min_slope_slide_angle_radians(30f32.to_radians())
            .autostep(CharacterAutostep {
                max_height: CharacterLength::Absolute(0.2),
                min_width: CharacterLength::Relative(0.1),
                include_dynamic_bodies: false,
            }),
    );
    controller.spawn_child(Collider3DBuilder::capsule_y(0.5, 0.5));
    controller.spawn_child(
        MeshInstance3D::builder()
            .mesh(assets.add(Capsule::default()))
            .material(assets.add(Color::RED)),
    );

    // scene camera attached to character
    let camera_handle = controller
        .spawn_child(Camera3D::builder().fov(75.0))
        .on(Camera3D::free_look(1.0))
        // orbit
        .on::<Update>(|ctx| {
            let mut node = ctx.node_mut();
            let direction = node.transform.get_forward_vector() * -1.0;

            let position = direction * 5.0;
            node.transform.set_position(position);
        })
        .on::<Ready>(|ctx| {
            ctx.get_resource_mut::<Window>().set_cursor_locked(true);
            println!("Use WASD to move\nUse Space to jump");
        })
        .handle();

    // player movement
    controller.on::<Update>(move |ctx| {
        let mut node = ctx.node_mut();
        let input = ctx.get_resource::<Input>();

        if node.transform.position.y < BOTTOM {
            node.transform.position = Vec3::ZERO;
            node.velocity = Vec3::ZERO;
        }

        let camera = ctx.scene().get_ref(camera_handle).unwrap();
        let forward = camera
            .transform
            .get_forward_vector()
            .with_y(0.0)
            .normalize();
        let right = camera.transform.get_right_vector().with_y(0.0).normalize();

        let move_input = input.get_vector(
            &KeyCode::KeyA,
            &KeyCode::KeyD,
            &KeyCode::KeyS,
            &KeyCode::KeyW,
        );

        let move_speed = if input.keys.contains(&KeyCode::ShiftLeft) {
            SPRINT_SPEED
        } else {
            WALK_SPEED
        };

        let dir = (forward * move_input.y + right * move_input.x).normalize_or_zero() * move_speed;

        if input.keys.contains(&KeyCode::Space) && node.is_grounded() {
            node.velocity.y = JUMP_SPEED;
        }

        node.velocity.x = dir.x;
        node.velocity.z = dir.z;
    });

    scene
}

fn playground(assets: &AssetLibrary) -> Scene {
    let scene = Scene::default();

    // scene light souce
    scene.spawn(DirectionalLight::builder().direction((1.0, -1.0, -1.0)));

    // skybox and ibl
    let hdr = assets.load("res/kloofendal_48d_partly_cloudy_puresky_4k.hdr");
    scene.spawn(Environment::new(hdr.clone()).with_ibl_strength(0.2));

    // ground for player to stand on
    let ground = scene.spawn(RigidBody3DBuilder::fixed().position((0.0, -5.0, 0.0)));
    ground.spawn_child(Collider3DBuilder::cuboid(20.0, 0.5, 20.0));
    ground.spawn_child(
        MeshInstance3D::builder()
            .mesh(assets.add(Cuboid {
                hx: 20.0,
                hy: 0.5,
                hz: 20.0,
            }))
            .material(assets.add(PbrMaterial::default())),
    );

    let ramp = scene.spawn(
        RigidBody3DBuilder::fixed()
            .position((-12.5, 0.0, 0.0))
            .rotation_euler_xyz_degrees((0.0, 0.0, 50.0)),
    );
    ramp.spawn_child(Collider3DBuilder::cuboid(0.5, 10.0, 1.0));
    ramp.spawn_child(
        MeshInstance3D::builder()
            .mesh(assets.add(Cuboid {
                hx: 0.5,
                hy: 10.0,
                hz: 1.0,
            }))
            .material(assets.add(Color::WHITE)),
    );

    let ramp = scene.spawn(
        RigidBody3DBuilder::fixed()
            .position((-10.0, 0.0, 3.0))
            .rotation_euler_xyz_degrees((0.0, 0.0, 30.0)),
    );
    ramp.spawn_child(Collider3DBuilder::cuboid(0.5, 10.0, 1.0));
    ramp.spawn_child(
        MeshInstance3D::builder()
            .mesh(assets.add(Cuboid::new(0.5, 10.0, 1.0)))
            .material(assets.add(Color::WHITE)),
    );

    // stair archway
    let initial = Vec3::new(5.0, -4.4, 5.0);
    let mesh = assets.add(Cuboid::new(0.2, 0.1, 1.0));
    let material = assets.add(Color::WHITE);
    for x in 0..=40 {
        let height = f32::sin(x as f32 / 40.0 * PI) * 3.0;
        scene
            .spawn(RigidBody3DBuilder::fixed().position((
                initial.x + x as f32 * 0.3,
                initial.y + height,
                0.0,
            )))
            .spawn_child(Collider3DBuilder::cuboid(0.2, 0.1, 1.0))
            .spawn_child(
                MeshInstance3D::builder()
                    .mesh(mesh.clone())
                    .material(material.clone()),
            );
    }

    scene
        .spawn(RigidBody3DBuilder::dynamic().position((-5.0, 0.0, -5.0)))
        .on::<Update>(|ctx| {
            let mut node = ctx.node_mut();
            if node.transform.position.y < BOTTOM {
                node.velocity = Vec3::ZERO;
                node.transform.position = Vec3 {
                    x: -5.0,
                    y: 0.0,
                    z: -5.0,
                }
            }
        })
        .spawn_child(Collider3DBuilder::cube(0.5).mass(1.0))
        .spawn_child(
            MeshInstance3D::builder()
                .mesh(assets.add(Cuboid::default()))
                .material(assets.add(Color::BLUE)),
        );

    scene
        .spawn(RigidBody3DBuilder::dynamic().position((5.0, 0.0, 5.0)))
        .on::<Update>(|ctx| {
            let mut node = ctx.node_mut();
            if node.transform.position.y < BOTTOM {
                node.velocity = Vec3::ZERO;
                node.transform.position = Vec3 {
                    x: 5.0,
                    y: 0.0,
                    z: 5.0,
                }
            }
        })
        .spawn_child(Collider3DBuilder::ball(0.5).mass(1.0).restitution(0.9))
        .spawn_child(
            MeshInstance3D::builder()
                .mesh(assets.add(Sphere::new(0.5)))
                .material(assets.add(PbrMaterial {
                    base_color_factor: Color::BLUE,
                    metallic_factor: 0.9,
                    roughness_factor: 0.05,
                    ..Default::default()
                })),
        );
    scene
}