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

// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
// SPDX-License-Identifier: Apache-2.0

//! Chest (pectoral/ribcage) shape morph control.

#![allow(dead_code)]

/// Chest shape parameters.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct ChestControl {
    pub width: f32,
    pub depth: f32,
    pub height: f32,
    pub shape: f32,
}

/// Returns a default `ChestControl`.
#[allow(dead_code)]
pub fn default_chest_control() -> ChestControl {
    ChestControl {
        width: 0.5,
        depth: 0.5,
        height: 0.5,
        shape: 0.0,
    }
}

/// Applies chest control values to a weight slice.
/// Indices: [0] = width, [1] = depth, [2] = height, [3] = shape.
#[allow(dead_code)]
pub fn apply_chest_control(weights: &mut [f32], cc: &ChestControl) {
    if !weights.is_empty() {
        weights[0] = cc.width;
    }
    if weights.len() > 1 {
        weights[1] = cc.depth;
    }
    if weights.len() > 2 {
        weights[2] = cc.height;
    }
    if weights.len() > 3 {
        weights[3] = cc.shape;
    }
}

/// Linearly blends two `ChestControl` values by parameter `t` in [0, 1].
#[allow(dead_code)]
pub fn chest_control_blend(a: &ChestControl, b: &ChestControl, t: f32) -> ChestControl {
    let t = t.clamp(0.0, 1.0);
    ChestControl {
        width: a.width + (b.width - a.width) * t,
        depth: a.depth + (b.depth - a.depth) * t,
        height: a.height + (b.height - a.height) * t,
        shape: a.shape + (b.shape - a.shape) * t,
    }
}

/// Approximate chest volume as a scaled ellipsoid.
#[allow(dead_code)]
pub fn chest_volume_approx(cc: &ChestControl) -> f32 {
    use std::f32::consts::PI;
    (4.0 / 3.0) * PI * cc.width * cc.depth * cc.height
}

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

    #[test]
    fn test_default_chest_control() {
        let cc = default_chest_control();
        assert!((cc.width - 0.5).abs() < 1e-6);
        assert!((cc.shape - 0.0).abs() < 1e-6);
    }

    #[test]
    fn test_apply_chest_full() {
        let cc = ChestControl { width: 0.6, depth: 0.4, height: 0.7, shape: 0.3 };
        let mut w = [0.0f32; 4];
        apply_chest_control(&mut w, &cc);
        assert!((w[0] - 0.6).abs() < 1e-6);
        assert!((w[3] - 0.3).abs() < 1e-6);
    }

    #[test]
    fn test_apply_chest_partial() {
        let cc = default_chest_control();
        let mut w = [0.0f32; 2];
        apply_chest_control(&mut w, &cc);
        assert!((w[0] - 0.5).abs() < 1e-6);
        assert!((w[1] - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_apply_chest_empty() {
        let cc = default_chest_control();
        let mut w: [f32; 0] = [];
        apply_chest_control(&mut w, &cc);
    }

    #[test]
    fn test_blend_at_zero() {
        let a = default_chest_control();
        let b = ChestControl { width: 1.0, depth: 1.0, height: 1.0, shape: 1.0 };
        let r = chest_control_blend(&a, &b, 0.0);
        assert!((r.width - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_blend_at_one() {
        let a = default_chest_control();
        let b = ChestControl { width: 1.0, depth: 1.0, height: 1.0, shape: 1.0 };
        let r = chest_control_blend(&a, &b, 1.0);
        assert!((r.width - 1.0).abs() < 1e-6);
    }

    #[test]
    fn test_blend_mid() {
        let a = default_chest_control();
        let b = ChestControl { width: 1.0, depth: 1.0, height: 1.0, shape: 1.0 };
        let r = chest_control_blend(&a, &b, 0.5);
        assert!((r.width - 0.75).abs() < 1e-5);
    }

    #[test]
    fn test_blend_clamps_negative_t() {
        let a = default_chest_control();
        let b = ChestControl { width: 0.0, depth: 0.0, height: 0.0, shape: 0.0 };
        let r = chest_control_blend(&a, &b, -1.0);
        assert!((r.width - a.width).abs() < 1e-6);
    }

    #[test]
    fn test_chest_volume_positive() {
        let cc = default_chest_control();
        assert!(chest_volume_approx(&cc) > 0.0);
    }

    #[test]
    fn test_chest_volume_zero_dim() {
        let cc = ChestControl { width: 0.0, depth: 0.5, height: 0.5, shape: 0.0 };
        assert!((chest_volume_approx(&cc)).abs() < 1e-9);
    }
}