Add Light trait and PointLight instance

This commit is contained in:
bijan2005 2021-01-23 22:52:50 -05:00
parent 53f5c8bac5
commit ed6e84a240
10 changed files with 123 additions and 48 deletions

View file

@ -28,11 +28,11 @@ This list may be changed or extended in the future.
- [x] Bounding spheres
- [ ] Direct lighting
- [ ] Point light sources
- [ ] Point source struct
- [ ] Point source illuminance test
- [x] Point source struct
- [x] Point source illuminance test
- [ ] Hard shadows
- [ ] Soft shadows
- [ ] Light-emitting surfaces
- [ ] ~~Light-emitting surfaces~~
- [ ] Indirect lighting
- [ ] Reflection
- [ ] Perfectly reflective objects

View file

@ -1,5 +1,5 @@
extern crate nalgebra as na;
use na::*;
use na::geometry::{Point2, Point3};

View file

@ -1,6 +1,5 @@
extern crate nalgebra as na;
use std::cmp::Ordering;
use std::fs::File;
use std::io::Write;
@ -10,22 +9,7 @@ use na::geometry::Point3;
mod camera; use camera::*;
mod types; use types::*;
mod object; use object::*;
fn trace(ray: Ray, objects: &Vec<Object>) -> Option<(&Object, f32)> {
objects.iter()
.filter_map(|obj| obj.intersect(ray)
.map(|x| (obj, x)))
.min_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(Ordering::Equal))
}
fn cast_ray(ray: Ray, scene: &Scene) -> Color {
if let Some((obj, dist)) = trace(ray, &scene.objects) {
let point = ray.project(dist);
obj.getcolor(point)
}
else { scene.background }
}
mod render; use render::*;
fn render(camera: &Camera, scene: &Scene, filename: &str) -> std::io::Result<()> {
let width = camera.image_size.x;
@ -58,6 +42,7 @@ fn main() -> std::io::Result<()> {
objects: vec![
Object::new(TriangleMesh::singleton(Point3::new(-1.0, -1.0, 2.0), Point3::new(0.0, 1.0, 2.0), Point3::new(1.0, -1.0, 2.0), |t, u, v| Color::new(t, u, v)))
],
lights: Vec::new(),
background: Color::black()
};

View file

@ -3,6 +3,7 @@ mod sphere; pub use sphere::*;
mod plane; pub use plane::*;
mod triangle; pub use triangle::*;
mod bound; pub use bound::*;
mod pointlight; pub use pointlight::*;
use na::*;
@ -33,24 +34,7 @@ pub struct Object {
bound: Bound
}
#[allow(dead_code)]
impl Object {
// Creates a new object with a custom bounding sphere.
pub fn new_(surface: impl 'static + Surface, center: Point3<f32>, radius: f32) -> Self {
Object {
surface: Box::new(surface),
bound: Bound { center: center, radius: radius, bypass: false }
}
}
// Creates a new object with no bounding sphere.
pub fn new_boundless(surface: impl 'static + Surface) -> Self {
Object {
surface: Box::new(surface),
bound: Bound::bypass()
}
}
// Creates a new object with the default bounding sphere.
pub fn new(surface: impl 'static + Surface) -> Self {
let bound = surface.bound();
@ -70,9 +54,15 @@ impl Object {
pub fn getcolor(&self, point: Point3<f32>) -> Color { self.surface.getcolor(point) }
}
pub trait Light {
// Determine if the light is able to illuminate the point.
// If so, return the color of the light.
fn illuminate(&self, point: Point3<f32>, objects: &Vec<Object>) -> Option<Color>;
}
pub struct Scene {
pub objects: Vec<Object>,
pub lights: Vec<Box<dyn Light>>,
pub background: Color
}

View file

@ -1,6 +1,6 @@
extern crate nalgebra as na;
use na::distance;
// use na::distance;
use na::geometry::Point3;
use crate::types::Ray;
@ -24,7 +24,7 @@ impl Bound {
l.norm_squared() >= self.radius * self.radius
}
pub fn contains(&self, point: &Point3<f32>) -> bool { distance(&self.center, point) < self.radius }
// pub fn contains(&self, point: &Point3<f32>) -> bool { distance(&self.center, point) < self.radius }
pub fn bypass() -> Self { Bound { center: Point3::origin(), radius: 0.0, bypass: true } }
}

View file

@ -67,7 +67,7 @@ impl Surface for Plane {
fn intersect(&self, ray: Ray) -> Option<f32> {
let d = self.normal.dot(&ray.direction);
if d < 1e-5 { return None; }
if d < 1e-3 { return None; }
let t = (self.center - ray.origin).dot(&*self.normal) / d;

36
src/object/pointlight.rs Normal file
View file

@ -0,0 +1,36 @@
extern crate nalgebra as na;
use na::*;
use na::geometry::Point3;
use crate::types::*;
use super::*;
pub struct PointLight {
pub pos: Point3<f32>,
pub color: Color
}
impl PointLight {
pub fn new(pos: Point3<f32>, color: Color) -> PointLight {
PointLight {
pos: pos,
color: color
}
}
fn check_point(&self, point: Point3<f32>, objects: &Vec<Object>) -> bool {
let max_d = distance(&self.pos, &point);
objects.iter()
.filter_map(|obj| obj.intersect(Ray::from_points(self.pos, point)))
.all(|d| d > max_d)
}
}
impl Light for PointLight {
fn illuminate(&self, point: Point3<f32>, objects: &Vec<Object>) -> Option<Color> {
if self.check_point(point, objects) {
Some(self.color)
} else { None }
}
}

View file

@ -57,7 +57,7 @@ impl Triangle {
let p_vect = ray.direction.cross(&vect3_1);
let det = p_vect.dot(&vect2_1);
if det.abs() < 1e-5 { return None; }
if det.abs() < 1e-3 { return None; }
let t_vect = ray.origin - self.vertex1(vertices);
let u = t_vect.dot(&p_vect) / det;
@ -238,7 +238,7 @@ impl Surface for TriangleMesh {
let (center, radius) = smallest_sphere(points, Vec::new());
Bound { center: center, radius: radius + 0.01, bypass: false }
Bound { center: center, radius: radius + 1e-3, bypass: false }
}
}

25
src/render.rs Normal file
View file

@ -0,0 +1,25 @@
extern crate nalgebra as na;
use std::cmp::Ordering;
use na::*;
use na::geometry::Point3;
use crate::types::*;
use crate::object::*;
fn trace(ray: Ray, objects: &Vec<Object>) -> Option<(&Object, f32)> {
objects.iter()
.filter_map(|obj| obj.intersect(ray)
.map(|x| (obj, x)))
.min_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(Ordering::Equal))
}
pub fn cast_ray(ray: Ray, scene: &Scene) -> Color {
if let Some((obj, dist)) = trace(ray, &scene.objects) {
let point = ray.project(dist);
obj.getcolor(point)
}
else { scene.background }
}

View file

@ -1,4 +1,7 @@
extern crate nalgebra as na;
use std::ops::{Add, Mul};
use na::*;
use na::geometry::Point3;
@ -16,7 +19,7 @@ impl Ray {
}
}
pub fn new(origin: Point3<f32>, direction: Vector3<f32>) -> Self { Ray::from_parts(origin, Unit::new_normalize(direction)) }
pub fn from_points(a: Point3<f32>, b: Point3<f32>) -> Self { Ray::new(a, b - a) }
pub fn from_points(origin: Point3<f32>, points_to: Point3<f32>) -> Self { Ray::new(origin, points_to - origin) }
pub fn project(&self, t: f32) -> Point3<f32> { self.origin + t * self.direction.into_inner() }
}
@ -34,9 +37,9 @@ pub struct Color {
impl Color {
pub fn new(red: f32, green: f32, blue: f32) -> Self {
Color {
red: clamp(red, 0.0, 1.0),
green: clamp(green, 0.0, 1.0),
blue: clamp(blue, 0.0, 1.0),
red: if red < 0.0 { 0.0 } else { red },
green: if green < 0.0 { 0.0 } else { green },
blue: if blue < 0.0 { 0.0 } else { blue },
_private: ()
}
@ -54,3 +57,39 @@ impl Color {
pub fn black() -> Self { Color::gray(0.0) }
pub fn white() -> Self { Color::gray(1.0) }
}
impl Add for Color {
type Output = Color;
fn add(self, rhs: Color) -> Color {
Color {
red: self.red + rhs.red,
green: self.green + rhs.green,
blue: self.blue + rhs.blue,
_private: ()
}
}
}
impl Mul for Color {
type Output = Color;
fn mul(self, rhs: Color) -> Color {
Color {
red: self.red * rhs.red,
green: self.green * rhs.green,
blue: self.blue * rhs.blue,
_private: ()
}
}
}
impl Mul<f32> for Color {
type Output = Color;
fn mul(self, rhs: f32) -> Color {
Color {
red: self.red * rhs,
green: self.green * rhs,
blue: self.blue * rhs,
_private: ()
}
}
}