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

// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
// SPDX-License-Identifier: Apache-2.0
#![allow(dead_code)]

/// A transition between two expression states over a duration.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct ExpressionTransition {
    pub from: String,
    pub to: String,
    pub duration: f32,
    pub elapsed: f32,
}

/// Create a new expression transition.
#[allow(dead_code)]
pub fn new_expression_transition(from: &str, to: &str, duration: f32) -> ExpressionTransition {
    ExpressionTransition {
        from: from.to_string(),
        to: to.to_string(),
        duration: duration.max(0.001),
        elapsed: 0.0,
    }
}

/// Advance the transition by dt seconds, returning the current blend factor.
#[allow(dead_code)]
pub fn transition_update(trans: &mut ExpressionTransition, dt: f32) -> f32 {
    trans.elapsed = (trans.elapsed + dt).min(trans.duration);
    transition_progress(trans)
}

/// Return the current progress (0..=1).
#[allow(dead_code)]
pub fn transition_progress(trans: &ExpressionTransition) -> f32 {
    (trans.elapsed / trans.duration).clamp(0.0, 1.0)
}

/// Check if the transition is complete.
#[allow(dead_code)]
pub fn transition_is_complete(trans: &ExpressionTransition) -> bool {
    trans.elapsed >= trans.duration
}

/// Return the duration of the transition.
#[allow(dead_code)]
pub fn transition_duration(trans: &ExpressionTransition) -> f32 {
    trans.duration
}

/// Return the source expression name.
#[allow(dead_code)]
pub fn transition_from(trans: &ExpressionTransition) -> &str {
    &trans.from
}

/// Return the target expression name.
#[allow(dead_code)]
pub fn transition_to_expr(trans: &ExpressionTransition) -> &str {
    &trans.to
}

/// Reset the transition to the beginning.
#[allow(dead_code)]
pub fn transition_reset(trans: &mut ExpressionTransition) {
    trans.elapsed = 0.0;
}

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

    #[test]
    fn new_transition() {
        let t = new_expression_transition("idle", "smile", 1.0);
        assert!(!transition_is_complete(&t));
    }

    #[test]
    fn progress_starts_zero() {
        let t = new_expression_transition("a", "b", 1.0);
        assert!(transition_progress(&t) < 1e-6);
    }

    #[test]
    fn update_advances() {
        let mut t = new_expression_transition("a", "b", 1.0);
        let p = transition_update(&mut t, 0.5);
        assert!((p - 0.5).abs() < 1e-6);
    }

    #[test]
    fn complete_at_end() {
        let mut t = new_expression_transition("a", "b", 1.0);
        transition_update(&mut t, 1.5);
        assert!(transition_is_complete(&t));
    }

    #[test]
    fn duration_accessor() {
        let t = new_expression_transition("a", "b", 2.0);
        assert!((transition_duration(&t) - 2.0).abs() < 1e-6);
    }

    #[test]
    fn from_accessor() {
        let t = new_expression_transition("idle", "smile", 1.0);
        assert_eq!(transition_from(&t), "idle");
    }

    #[test]
    fn to_accessor() {
        let t = new_expression_transition("idle", "smile", 1.0);
        assert_eq!(transition_to_expr(&t), "smile");
    }

    #[test]
    fn reset_works() {
        let mut t = new_expression_transition("a", "b", 1.0);
        transition_update(&mut t, 0.5);
        transition_reset(&mut t);
        assert!(transition_progress(&t) < 1e-6);
    }

    #[test]
    fn clamped_progress() {
        let mut t = new_expression_transition("a", "b", 1.0);
        transition_update(&mut t, 5.0);
        assert!((transition_progress(&t) - 1.0).abs() < 1e-6);
    }

    #[test]
    fn min_duration() {
        let t = new_expression_transition("a", "b", 0.0);
        assert!(transition_duration(&t) > 0.0);
    }
}