Kiana Sheibani
763a4ff923
I don't know why I wasn't using 64 bit floats from the beginning, honestly. I had weird priorities back then
47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
extern crate nalgebra as na;
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use std::cmp::Ordering;
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use std::f64::consts::PI;
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use na::geometry::Point3;
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use na::*;
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use crate::object::*;
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use crate::types::*;
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fn trace(ray: Ray, objects: &Vec<Object>) -> Option<(&Object, f64)> {
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objects
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.iter()
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.filter_map(|obj| obj.intersect(ray).map(|x| (obj, x)))
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.min_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(Ordering::Equal))
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}
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fn light_point(objects: &Vec<Object>, obj: &Object, point: Point3f, light: &dyn Light) -> Color {
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if light.check_shadow(point, objects) {
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let texture = obj.get_texture(point);
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light.get_color(point)
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* (texture.albedo / PI)
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* light.intensity(point)
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* obj.normal(point).dot(&*light.direction(point))
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} else {
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// Point is in shadow
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Color::black()
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}
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}
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pub fn cast_ray(ray: Ray, scene: &Scene) -> Color {
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if let Some((obj, dist)) = trace(ray, &scene.objects) {
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let point = ray.project(dist);
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let surface_color = obj.get_texture(point).color;
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scene
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.lights
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.iter()
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.map(|light| light_point(&scene.objects, obj, point, &**light))
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.fold(Color::black(), |acc, c| acc + c)
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* surface_color
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} else {
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scene.background
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}
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}
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