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
154
155
156
157
158
|
use crate::*;
struct VertAttr<L, F, T, V> {
func: F,
items: Vec<T>,
local: HashMap<usize, Option<usize>>,
// global: HashMap<T, usize>,
marker: std::marker::PhantomData<(V, L)>,
}
impl<L, F, T, V> VertAttr<L, F, T, V>
where
F: FnMut(L, &V) -> Option<T>,
T: Copy, // + Hash + Eq,
{
fn new(func: F) -> Self {
Self {
func,
items: Vec::new(),
local: HashMap::new(),
// global: HashMap::new(),
marker: std::marker::PhantomData,
}
}
fn add(&mut self, local: L, vert_id: usize, vert_data: &V) -> Option<usize> {
*self.local.entry(vert_id).or_insert_with(|| {
let item = (self.func)(local, vert_data);
//*self.global.entry(item).or_insert_with(|| {
item.map(|item| {
self.items.push(item);
self.items.len()
})
//})
})
}
}
pub struct ObjExport<'tok, 'brand, 'arena, V, W, VPos, VTex, VNorm> {
writer: &'tok mut W,
dcel: &'tok Dcel<'brand, 'arena, V>,
vertex_pos: VPos,
pos_ids: Vec<Option<usize>>,
textures: VertAttr<lens!(Face), VTex, (f64, Option<(f64, Option<f64>)>), V>,
normals: VertAttr<lens!(Face), VNorm, (f64, f64, f64), V>,
}
impl<'tok, 'brand, 'arena, V, W, VPos, VTex, VNorm>
ObjExport<'tok, 'brand, 'arena, V, W, VPos, VTex, VNorm>
where
W: std::io::Write,
VPos: FnMut(&V) -> (f64, f64, f64, Option<f64>),
VTex: FnMut(lens!(Face), &V) -> Option<(f64, Option<(f64, Option<f64>)>)>,
VNorm: FnMut(lens!(Face), &V) -> Option<(f64, f64, f64)>,
{
pub fn export(
writer: &'tok mut W,
dcel: &'tok Dcel<'brand, 'arena, V>,
vertex_pos: VPos,
vertex_texture: VTex,
vertex_normal: VNorm,
) -> std::io::Result<()> {
Self {
writer,
dcel,
vertex_pos,
pos_ids: Vec::new(),
textures: VertAttr::new(vertex_texture),
normals: VertAttr::new(vertex_normal),
}
.write()
}
fn write(&mut self) -> std::io::Result<()> {
let mut next_id = 1;
for shell in self.dcel.iter_bodies().flat_map(Lens::iter_shells) {
for vertex in shell.iter_vertices() {
let v_id = vertex.id();
if v_id <= self.pos_ids.len() {
self.pos_ids.resize(v_id + 1, None);
}
self.pos_ids.insert(v_id, Some(next_id));
next_id += 1;
let (x, y, z, w) = (self.vertex_pos)(vertex.data());
write!(self.writer, "v {x} {y} {z}")?;
if let Some(w) = w {
write!(self.writer, " {w}")?;
}
writeln!(self.writer)?;
}
for face in shell.iter_faces() {
write!(self.writer, "f")?;
for inner in face.iter_inner_loops() {
self.write_vertex(face, face.outer_loop().half_edges())?;
for h in inner.iter_half_edges() {
self.write_vertex(face, h)?;
}
}
for h in face.outer_loop().iter_half_edges() {
self.write_vertex(face, h)?;
}
self.textures.local.clear();
self.normals.local.clear();
writeln!(self.writer)?;
}
}
for (u, vw) in &self.textures.items {
write!(self.writer, "vt {u}")?;
if let Some((v, w)) = vw {
write!(self.writer, " {v}")?;
if let Some(w) = w {
write!(self.writer, " {w}")?;
}
}
writeln!(self.writer)?;
}
for (x, y, z) in &self.normals.items {
writeln!(self.writer, "vn {x} {y} {z}")?;
}
Ok(())
}
fn write_vertex(
&mut self,
face: lens!(Face),
half_edge: lens!(HalfEdge),
) -> std::io::Result<()> {
let vert = half_edge.origin();
write!(self.writer, " {}", self.pos_ids[vert.id()].unwrap())?;
let t = self.textures.add(face, vert.id(), vert.data());
let n = self.normals.add(face, vert.id(), vert.data());
if t.is_some() || n.is_some() {
write!(self.writer, "/")?;
}
if let Some(t) = t {
write!(self.writer, "{t}")?;
}
if let Some(n) = n {
write!(self.writer, "/{n}")?;
}
Ok(())
}
}
|
