oxihuman-mesh 0.2.1

Mesh processing, topology, and geometry algorithms for OxiHuman
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

#![allow(dead_code)]
//! Mesh shape key (blend shape) storage.

/// A shape key with per-vertex deltas.
#[allow(dead_code)]
#[derive(Debug, Clone, PartialEq)]
pub struct MeshShapeKey {
    pub name: String,
    pub deltas: Vec<[f32; 3]>,
    pub weight: f32,
}

/// Create a new shape key.
#[allow(dead_code)]
pub fn new_mesh_shape_key(name: &str, vertex_count: usize) -> MeshShapeKey {
    MeshShapeKey {
        name: name.to_string(),
        deltas: vec![[0.0; 3]; vertex_count],
        weight: 0.0,
    }
}

/// Get delta at a vertex.
#[allow(dead_code)]
pub fn shape_key_delta(key: &MeshShapeKey, index: usize) -> [f32; 3] {
    if index < key.deltas.len() {
        key.deltas[index]
    } else {
        [0.0; 3]
    }
}

/// Return shape key name.
#[allow(dead_code)]
pub fn shape_key_name(key: &MeshShapeKey) -> &str {
    &key.name
}

/// Set the weight.
#[allow(dead_code)]
pub fn set_shape_weight(key: &mut MeshShapeKey, weight: f32) {
    key.weight = weight.clamp(0.0, 1.0);
}

/// Get the weight.
#[allow(dead_code)]
pub fn get_shape_weight(key: &MeshShapeKey) -> f32 {
    key.weight
}

/// Apply the shape key to positions based on current weight.
#[allow(dead_code)]
pub fn apply_shape_key(key: &MeshShapeKey, positions: &mut [[f32; 3]]) {
    let w = key.weight;
    for (pos, d) in positions.iter_mut().zip(key.deltas.iter()) {
        pos[0] += d[0] * w;
        pos[1] += d[1] * w;
        pos[2] += d[2] * w;
    }
}

/// Return vertex count.
#[allow(dead_code)]
pub fn shape_key_vertex_count(key: &MeshShapeKey) -> usize {
    key.deltas.len()
}

/// Serialize to JSON.
#[allow(dead_code)]
pub fn shape_key_to_json(key: &MeshShapeKey) -> String {
    format!(
        "{{\"name\":\"{}\",\"vertex_count\":{},\"weight\":{:.4}}}",
        key.name,
        key.deltas.len(),
        key.weight
    )
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_new_mesh_shape_key() {
        let k = new_mesh_shape_key("smile", 10);
        assert_eq!(shape_key_vertex_count(&k), 10);
    }

    #[test]
    fn test_shape_key_name() {
        let k = new_mesh_shape_key("blink", 1);
        assert_eq!(shape_key_name(&k), "blink");
    }

    #[test]
    fn test_set_get_weight() {
        let mut k = new_mesh_shape_key("t", 1);
        set_shape_weight(&mut k, 0.5);
        assert!((get_shape_weight(&k) - 0.5).abs() < 0.001);
    }

    #[test]
    fn test_weight_clamp() {
        let mut k = new_mesh_shape_key("t", 1);
        set_shape_weight(&mut k, 2.0);
        assert!((get_shape_weight(&k) - 1.0).abs() < 0.001);
    }

    #[test]
    fn test_shape_key_delta() {
        let mut k = new_mesh_shape_key("t", 2);
        k.deltas[0] = [1.0, 2.0, 3.0];
        assert_eq!(shape_key_delta(&k, 0), [1.0, 2.0, 3.0]);
    }

    #[test]
    fn test_shape_key_delta_oob() {
        let k = new_mesh_shape_key("t", 1);
        assert_eq!(shape_key_delta(&k, 10), [0.0; 3]);
    }

    #[test]
    fn test_apply_shape_key() {
        let mut k = new_mesh_shape_key("t", 1);
        k.deltas[0] = [10.0, 0.0, 0.0];
        set_shape_weight(&mut k, 0.5);
        let mut pos = [[0.0, 0.0, 0.0]];
        apply_shape_key(&k, &mut pos);
        assert!((pos[0][0] - 5.0).abs() < 0.001);
    }

    #[test]
    fn test_shape_key_to_json() {
        let k = new_mesh_shape_key("smile", 5);
        let j = shape_key_to_json(&k);
        assert!(j.contains("\"name\":\"smile\""));
    }

    #[test]
    fn test_zero_weight_no_effect() {
        let mut k = new_mesh_shape_key("t", 1);
        k.deltas[0] = [10.0, 10.0, 10.0];
        let mut pos = [[0.0; 3]];
        apply_shape_key(&k, &mut pos);
        assert_eq!(pos[0], [0.0; 3]);
    }

    #[test]
    fn test_empty_shape_key() {
        let k = new_mesh_shape_key("e", 0);
        assert_eq!(shape_key_vertex_count(&k), 0);
    }
}