oxihuman-morph 0.1.2

Parametric morphology engine for human body generation — targets, blendshapes, FACS
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

#![allow(dead_code)]

/// A node in a morph blend tree.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct MorphBlendNode {
    pub name: String,
    pub weight: f32,
    pub children: Vec<usize>,
}

/// Tree structure for hierarchical morph blending.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct MorphBlendTree {
    nodes: Vec<MorphBlendNode>,
}

#[allow(dead_code)]
pub fn new_morph_blend_tree() -> MorphBlendTree {
    MorphBlendTree { nodes: Vec::new() }
}

#[allow(dead_code)]
pub fn add_morph_blend_node(tree: &mut MorphBlendTree, name: &str, weight: f32) -> usize {
    let idx = tree.nodes.len();
    tree.nodes.push(MorphBlendNode { name: name.to_string(), weight, children: Vec::new() });
    idx
}

#[allow(dead_code)]
pub fn evaluate_morph_blend(tree: &MorphBlendTree) -> f32 {
    if tree.nodes.is_empty() { return 0.0; }
    fn eval_node(tree: &MorphBlendTree, idx: usize) -> f32 {
        let node = &tree.nodes[idx];
        if node.children.is_empty() {
            return node.weight;
        }
        let child_sum: f32 = node.children.iter().map(|&c| eval_node(tree, c)).sum();
        node.weight * child_sum
    }
    eval_node(tree, 0)
}

#[allow(dead_code)]
pub fn blend_node_count(tree: &MorphBlendTree) -> usize {
    tree.nodes.len()
}

#[allow(dead_code)]
pub fn blend_node_weight(tree: &MorphBlendTree, idx: usize) -> f32 {
    tree.nodes.get(idx).map(|n| n.weight).unwrap_or(0.0)
}

#[allow(dead_code)]
pub fn blend_tree_to_json_mbt(tree: &MorphBlendTree) -> String {
    let entries: Vec<String> = tree.nodes.iter().map(|n| {
        format!("{{\"name\":\"{}\",\"weight\":{:.4}}}", n.name, n.weight)
    }).collect();
    format!("{{\"nodes\":[{}]}}", entries.join(","))
}

#[allow(dead_code)]
pub fn blend_tree_reset(tree: &mut MorphBlendTree) {
    tree.nodes.clear();
}

#[allow(dead_code)]
pub fn blend_tree_depth(tree: &MorphBlendTree) -> usize {
    if tree.nodes.is_empty() { return 0; }
    fn depth(tree: &MorphBlendTree, idx: usize) -> usize {
        let node = &tree.nodes[idx];
        if node.children.is_empty() { return 1; }
        1 + node.children.iter().map(|&c| depth(tree, c)).max().unwrap_or(0)
    }
    depth(tree, 0)
}

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

    #[test]
    fn test_new() { let t = new_morph_blend_tree(); assert_eq!(blend_node_count(&t), 0); }

    #[test]
    fn test_add_node() {
        let mut t = new_morph_blend_tree();
        let i = add_morph_blend_node(&mut t, "root", 1.0);
        assert_eq!(i, 0);
        assert_eq!(blend_node_count(&t), 1);
    }

    #[test]
    fn test_evaluate_single() {
        let mut t = new_morph_blend_tree();
        add_morph_blend_node(&mut t, "root", 0.5);
        assert!((evaluate_morph_blend(&t) - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_evaluate_empty() {
        let t = new_morph_blend_tree();
        assert!((evaluate_morph_blend(&t)).abs() < 1e-6);
    }

    #[test]
    fn test_node_weight() {
        let mut t = new_morph_blend_tree();
        add_morph_blend_node(&mut t, "a", 0.7);
        assert!((blend_node_weight(&t, 0) - 0.7).abs() < 1e-6);
    }

    #[test]
    fn test_node_weight_missing() {
        let t = new_morph_blend_tree();
        assert!((blend_node_weight(&t, 99)).abs() < 1e-6);
    }

    #[test]
    fn test_to_json() {
        let mut t = new_morph_blend_tree();
        add_morph_blend_node(&mut t, "root", 1.0);
        let j = blend_tree_to_json_mbt(&t);
        assert!(j.contains("root"));
    }

    #[test]
    fn test_reset() {
        let mut t = new_morph_blend_tree();
        add_morph_blend_node(&mut t, "a", 1.0);
        blend_tree_reset(&mut t);
        assert_eq!(blend_node_count(&t), 0);
    }

    #[test]
    fn test_depth_empty() {
        let t = new_morph_blend_tree();
        assert_eq!(blend_tree_depth(&t), 0);
    }

    #[test]
    fn test_depth_single() {
        let mut t = new_morph_blend_tree();
        add_morph_blend_node(&mut t, "root", 1.0);
        assert_eq!(blend_tree_depth(&t), 1);
    }
}