enigma-3d 0.2.15

A 3D Rendering Engine with a focus on simplicity and ease of use. Far from feature complete and not recommended for production use.
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
225
226
227
228
229
230
231
232
233
234
235
236
237
238

use crate::object::{Transform, TransformSerializer};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
pub struct CameraSerializer {
    transform: TransformSerializer,
    fov: f32,
    width: f32,
    height: f32,
    near: f32,
    far: f32,
    view: [[f32; 4]; 4],
    projection: [[f32; 4]; 4],
}

#[derive(Copy, Clone)]
pub struct Camera {
    pub transform: Transform,
    pub fov: f32,
    pub width: f32,
    pub height: f32,
    pub near: f32,
    pub far: f32,
    pub view: [[f32; 4]; 4],
    pub projection: [[f32; 4]; 4],
}


impl Camera {
    pub fn new(
        position: Option<[f32; 3]>,
        rotation: Option<[f32; 3]>, // Expected in degrees, will be converted to radians
        fov: Option<f32>, // Expected in degrees, will be converted to radians
        aspect: Option<f32>,
        near: Option<f32>,
        far: Option<f32>
    ) -> Self {
        let mut c = Self {
            transform: {
                let mut t = Transform::new();
                t.set_position(position.unwrap_or_else(|| [0.0, 0.0, 0.0]));
                t.set_rotation(rotation.unwrap_or_else(|| [0.0, 0.0, 0.0]));
                t
            },
            fov: fov.unwrap_or_else(|| 90.0).to_radians(),
            width: aspect.unwrap_or_else(|| 1920.0),
            height: aspect.unwrap_or_else(|| 1080.0),
            near: near.unwrap_or_else(|| 0.1),
            far: far.unwrap_or_else(|| 1024.0),
            view: [[0.0; 4]; 4],
            projection: [[0.0; 4]; 4],
        };
        c.update_matrices();
        c
    }

    pub fn default() -> Self {
        Camera::new(None, None, None, None, None, None)
    }

    pub fn from_serializer(serializer: CameraSerializer) -> Self {
        Self {
            transform: Transform::from_serializer(serializer.transform),
            fov: serializer.fov,
            width: serializer.width,
            height: serializer.height,
            near: serializer.near,
            far: serializer.far,
            view: serializer.view,
            projection: serializer.projection,
        }
    }

    pub fn to_serializer(&self) -> CameraSerializer {
        CameraSerializer {
            transform: self.transform.to_serializer(),
            fov: self.fov,
            width: self.width,
            height: self.height,
            near: self.near,
            far: self.far,
            view: self.view,
            projection: self.projection,
        }
    }

    pub fn update_matrices(&mut self) {
        self.view = Camera::view_matrix(
            &self.transform.get_position().into(),
            &self.calculate_direction_vector(),
            &[0.0, 1.0, 0.0],
        );
        self.projection = Camera::projection_matrix(
            self.fov,
            self.width / self.height,
            self.near,
            self.far,
        );
    }

    pub fn calculate_direction_vector(&self) -> [f32; 3] {
        let pitch = self.transform.rotation[0]; // Rotation around X-axis
        let yaw = self.transform.rotation[1];   // Rotation around Y-axis

        let x = yaw.sin() * pitch.cos();
        let y = pitch.sin();
        let z = yaw.cos() * pitch.cos();

        [-x, y, -z] // Pointing down negative Z-axis
    }


    fn projection_matrix(fov: f32, aspect: f32, near: f32, far: f32) -> [[f32; 4]; 4] {
        let f = 1.0 / (fov / 2.0).tan();
        [
            [f / aspect, 0.0, 0.0, 0.0],
            [0.0, f, 0.0, 0.0],
            [0.0, 0.0, (far + near) / (near - far), -1.0],
            [0.0, 0.0, (2.0 * far * near) / (near - far), 0.0],
        ]
    }

    fn view_matrix(position: &[f32; 3], direction: &[f32; 3], up: &[f32; 3]) -> [[f32; 4]; 4] {
        let f = {
            let len = (direction[0] * direction[0] + direction[1] * direction[1] + direction[2] * direction[2]).sqrt();
            [-direction[0] / len, -direction[1] / len, -direction[2] / len] // Negate direction for a right-handed system
        };

        let s = [
            up[1] * f[2] - up[2] * f[1],
            up[2] * f[0] - up[0] * f[2],
            up[0] * f[1] - up[1] * f[0],
        ];
        let s_norm = {
            let len = (s[0] * s[0] + s[1] * s[1] + s[2] * s[2]).sqrt();
            [s[0] / len, s[1] / len, s[2] / len]
        };

        let u = [
            f[1] * s_norm[2] - f[2] * s_norm[1],
            f[2] * s_norm[0] - f[0] * s_norm[2],
            f[0] * s_norm[1] - f[1] * s_norm[0],
        ];

        let p = [
            -position[0] * s_norm[0] - position[1] * s_norm[1] - position[2] * s_norm[2],
            -position[0] * u[0] - position[1] * u[1] - position[2] * u[2],
            -position[0] * f[0] - position[1] * f[1] - position[2] * f[2],
        ];

        [
            [s_norm[0], u[0], f[0], 0.0],
            [s_norm[1], u[1], f[1], 0.0],
            [s_norm[2], u[2], f[2], 0.0],
            [p[0], p[1], p[2], 1.0],
        ]
    }

    pub fn get_view_matrix(&self) -> [[f32; 4]; 4] {
        Camera::view_matrix(
            &self.transform.get_position().into(),
            &self.calculate_direction_vector(),
            &[0.0, 1.0, 0.0],
        )
    }

    pub fn get_projection_matrix(&self) -> [[f32; 4]; 4] {
        Camera::projection_matrix(
            self.fov,
            self.width / self.height,
            self.near,
            self.far,
        )
    }

    pub fn get_position(&self) -> [f32; 3] {
        self.transform.get_position().into()
    }

    pub fn get_rotation(&self) -> [f32; 3] {
        self.transform.get_rotation().into()
    }

    pub fn get_fov(&self) -> f32 {
        self.fov.clone()
    }

    pub fn get_aspect(&self) -> (f32, f32) {
        (self.width.clone(), self.height.clone())
    }

    pub fn get_near(&self) -> f32 {
        self.near.clone()
    }

    pub fn get_far(&self) -> f32 {
        self.far.clone()
    }

    pub fn get_view(&self) -> [[f32; 4]; 4] {
        self.view.clone()
    }

    pub fn get_projection(&self) -> [[f32; 4]; 4] {
        self.projection.clone()
    }

    pub fn set_position(&mut self, position: [f32; 3]) {
        self.transform.set_position(position);
        self.update_matrices();
    }

    pub fn set_rotation(&mut self, rotation: [f32; 3]) {
        self.transform.set_rotation(rotation);
        self.update_matrices();
    }

    pub fn set_fov(&mut self, fov: f32) {
        self.fov = fov;
        self.update_matrices();
    }

    pub fn set_aspect(&mut self, width: f32, heigth: f32) {
        self.width = width;
        self.height = heigth;
        self.update_matrices();
    }

    pub fn set_near(&mut self, near: f32) {
        self.near = near;
        self.update_matrices();
    }

    pub fn set_far(&mut self, far: f32) {
        self.far = far;
        self.update_matrices();
    }
}