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use std::sync::Arc;
use std::vec::Vec;
use crate::{hittable::{HitRecord, Hittable, AABB, HittableList, Triangle}, material::Material, ray::Ray, vec3::{Point3, Vec3}};
pub struct Model {
faces: HittableList,
}
impl Model {
fn parse_face_triplet(triplet: &str) -> Option<(isize, Option<isize>, Option<isize>)> {
let mut triplet_iter = triplet.split("/");
Some((triplet_iter.next()?.parse::<isize>().ok()?, triplet_iter.next().and_then(|val| val.parse::<isize>().ok()) , triplet_iter.next().and_then(|val| val.parse::<isize>().ok())))
}
pub fn from_obj(obj_data: &str, material: Arc<dyn Material>) -> Self {
let mut geometric_vertices: Vec<Vec3> = Vec::new();
let mut texture_vertices: Vec<(f64, f64)> = Vec::new();
let mut vertex_normals: Vec<Vec3> = Vec::new();
// no free-form objects, so no parameter-space vertices!
let mut faces: Vec<Arc<dyn Hittable>> = Vec::new();
for entry in obj_data.lines() {
if entry.starts_with("#") {
// comment
continue;
}
let mut entry_iter = entry.split(' ');
let operator = match entry_iter.next() {
None => continue,
Some(val) => val,
};
match operator {
"v" | "vn" => {
let x = match entry_iter.next() {
None => {
eprintln!("Malformed {} entry in OBJ: Missing x!", operator);
continue;
},
Some(val) => {
match val.parse::<f64>() {
Err(_) => {
eprintln!("Malformed {} entry in OBJ: Malformed f64 x!", operator);
continue;
},
Ok(val) => val,
}
}
};
let y = match entry_iter.next() {
None => {
eprintln!("Malformed {} entry in OBJ: Missing y!", operator);
continue;
},
Some(val) => {
match val.parse::<f64>() {
Err(_) => {
eprintln!("Malformed {} entry in OBJ: Malformed f64 y!", operator);
continue;
},
Ok(val) => val,
}
}
};
let z = match entry_iter.next() {
None => {
eprintln!("Malformed {} entry in OBJ: Missing z!", operator);
continue;
},
Some(val) => {
match val.parse::<f64>() {
Err(_) => {
eprintln!("Malformed {} entry in OBJ: Malformed f64 z!", operator);
continue;
},
Ok(val) => val,
}
}
};
// who cares about w
match operator {
"v" => geometric_vertices.push(Vec3 {x, y, z}),
"vn" => vertex_normals.push(Vec3 {x, y, z}),
_ => panic!(),
}
},
"vt" => {
let u = match entry_iter.next() {
None => {
eprintln!("Malformed vt entry in OBJ: Missing u!");
continue;
},
Some(val) => {
match val.parse::<f64>() {
Err(_) => {
eprintln!("Malformed vt entry in OBJ: Malformed f64 u!");
continue;
},
Ok(val) => val,
}
}
};
let v = match entry_iter.next() {
None => {
eprintln!("Malformed vt entry in OBJ: Missing v!");
continue;
},
Some(val) => {
match val.parse::<f64>() {
Err(_) => {
eprintln!("Malformed v entry in OBJ: Malformed f64 v!");
continue;
},
Ok(val) => val,
}
}
};
// who cares about w
texture_vertices.push((u, v));
},
"f" => {
let mut triplets : Vec<(isize, Option<isize>, Option<isize>)> = Vec::new();
for triplet in entry_iter {
match Self::parse_face_triplet(triplet) {
None => {
eprintln!("Encountered malformed triplet in f operator!");
},
Some(val) => {
triplets.push(val);
}
};
}
// only support faces with *exactly* three vertices. yeah, i know.
if triplets.len() != 3 {
eprintln!("Encountered face with unsupported vertex count!");
continue;
}
let mut v0_index = triplets.get(0).unwrap().0;
if v0_index < 0 {
v0_index = geometric_vertices.len() as isize + v0_index;
} else {
v0_index = v0_index - 1;
}
let mut v1_index = triplets.get(1).unwrap().0;
if v1_index < 0 {
v1_index = geometric_vertices.len() as isize + v1_index;
} else {
v1_index = v1_index - 1;
}
let mut v2_index = triplets.get(2).unwrap().0;
if v2_index < 0 {
v2_index = geometric_vertices.len() as isize + v2_index;
} else {
v2_index = v2_index - 1;
}
let mut triangle = Triangle {
v0: geometric_vertices.get(v0_index as usize).unwrap().clone(),
v1: geometric_vertices.get(v1_index as usize).unwrap().clone(),
v2: geometric_vertices.get(v2_index as usize).unwrap().clone(),
material: material.clone(),
custom_normal: None,
};
if let Some(vn0) = triplets.get(0).unwrap().2 {
if let Some(vn1) = triplets.get(1).unwrap().2 {
if let Some(vn2) = triplets.get(2).unwrap().2 {
if vn0 != vn1 || vn1 != vn2 {
eprintln!("Unsupported geometry in OBJ file: Multiple normals for face!");
continue
}
let mut vn0 = vn0;
if vn0 < 0 {
vn0 = vertex_normals.len() as isize + v0_index;
} else {
vn0 = vn0 - 1;
}
triangle.custom_normal = Some(vertex_normals.get(vn0 as usize).unwrap().unit_vector());
}
}
}
faces.push(Arc::new(triangle));
},
_ => {
eprintln!("Ignoring unknown operator {} in OBJ!", operator);
continue;
},
}
}
Self {
faces: HittableList { objects: faces },
}
}
}
impl Hittable for Model {
fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
self.faces.hit(ray, t_min, t_max)
}
fn bounding_box(&self, time_start: f64, time_end: f64) -> Option<AABB> {
self.faces.bounding_box(time_start, time_end)
}
}
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