oxihuman-export 0.1.2

Export pipeline for OxiHuman — glTF, COLLADA, STL, and streaming formats
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

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

/// Fur/hair strand export data.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct FurExport {
    pub strands: Vec<FurStrand>,
}

/// A single fur strand.
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct FurStrand {
    pub points: Vec<[f32; 3]>,
    pub thickness: f32,
}

#[allow(dead_code)]
impl FurExport {
    pub fn new() -> Self { Self { strands: Vec::new() } }

    pub fn add_strand(&mut self, points: Vec<[f32; 3]>, thickness: f32) {
        self.strands.push(FurStrand { points, thickness });
    }

    pub fn strand_count(&self) -> usize { self.strands.len() }

    pub fn total_points(&self) -> usize {
        self.strands.iter().map(|s| s.points.len()).sum()
    }

    pub fn average_length(&self) -> f32 {
        if self.strands.is_empty() { return 0.0; }
        let total: f32 = self.strands.iter().map(|s| strand_length(&s.points)).sum();
        total / self.strands.len() as f32
    }

    pub fn to_bytes(&self) -> Vec<u8> {
        let mut bytes = Vec::new();
        bytes.extend_from_slice(&(self.strands.len() as u32).to_le_bytes());
        for s in &self.strands {
            bytes.extend_from_slice(&(s.points.len() as u32).to_le_bytes());
            bytes.extend_from_slice(&s.thickness.to_le_bytes());
            for p in &s.points {
                for &f in p { bytes.extend_from_slice(&f.to_le_bytes()); }
            }
        }
        bytes
    }

    pub fn to_json(&self) -> String {
        format!(
            "{{\"strands\":{},\"total_points\":{},\"avg_length\":{}}}",
            self.strand_count(), self.total_points(), self.average_length()
        )
    }
}

impl Default for FurExport {
    fn default() -> Self { Self::new() }
}

#[allow(dead_code)]
fn strand_length(points: &[[f32; 3]]) -> f32 {
    let mut len = 0.0f32;
    for pair in points.windows(2) {
        let dx = pair[1][0]-pair[0][0];
        let dy = pair[1][1]-pair[0][1];
        let dz = pair[1][2]-pair[0][2];
        len += (dx*dx+dy*dy+dz*dz).sqrt();
    }
    len
}

/// Validate fur export.
#[allow(dead_code)]
pub fn validate_fur(fur: &FurExport) -> bool {
    fur.strands.iter().all(|s| s.points.len() >= 2 && s.thickness > 0.0)
}

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

    fn sample_fur() -> FurExport {
        let mut f = FurExport::new();
        f.add_strand(vec![[0.0,0.0,0.0],[0.0,1.0,0.0]], 0.01);
        f.add_strand(vec![[1.0,0.0,0.0],[1.0,2.0,0.0]], 0.02);
        f
    }

    #[test]
    fn test_strand_count() { assert_eq!(sample_fur().strand_count(), 2); }

    #[test]
    fn test_total_points() { assert_eq!(sample_fur().total_points(), 4); }

    #[test]
    fn test_average_length() {
        let avg = sample_fur().average_length();
        assert!(avg > 0.0);
    }

    #[test]
    fn test_to_bytes() { assert!(!sample_fur().to_bytes().is_empty()); }

    #[test]
    fn test_to_json() { assert!(sample_fur().to_json().contains("strands")); }

    #[test]
    fn test_validate() { assert!(validate_fur(&sample_fur())); }

    #[test]
    fn test_invalid_single_point() {
        let mut f = FurExport::new();
        f.add_strand(vec![[0.0,0.0,0.0]], 0.01);
        assert!(!validate_fur(&f));
    }

    #[test]
    fn test_empty() { assert_eq!(FurExport::new().strand_count(), 0); }

    #[test]
    fn test_default() { assert_eq!(FurExport::default().strand_count(), 0); }

    #[test]
    fn test_strand_length() {
        let len = strand_length(&[[0.0,0.0,0.0],[0.0,3.0,0.0],[0.0,3.0,4.0]]);
        assert!((len - 7.0).abs() < 1e-5);
    }
}