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zigrtiow: use hemisphere random rays.

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This commit is contained in:
Bill Thiede 2022-08-05 18:37:41 -07:00
parent 6d7998ad9f
commit a2012e6742
2 changed files with 10 additions and 3 deletions
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5
zigrtiow/src/main.zig
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@ -15,8 +15,7 @@ const Point3 = vec.Point3;
const Ray = ray.Ray; const Ray = ray.Ray;
const Sphere = sphere.Sphere; const Sphere = sphere.Sphere;
const Vec3 = vec.Vec3; const Vec3 = vec.Vec3;
const random_unit_vector = vec.random_unit_vector; const random_in_hemisphere = vec.random_in_hemisphere;
const random_in_unit_sphere = vec.random_in_unit_sphere;
const info = std.log.info; const info = std.log.info;
const write_color = color.write_color; const write_color = color.write_color;
@ -26,7 +25,7 @@ fn ray_color(r: Ray, world: Hittable, depth: isize) Color {
var hit = world.hit(r, 0.0001, std.math.inf(f32)); var hit = world.hit(r, 0.0001, std.math.inf(f32));
if (hit) |rec| { if (hit) |rec| {
const target = rec.p.add(rec.normal.add(random_unit_vector())); const target = rec.p.add(rec.normal.add(random_in_hemisphere(rec.normal)));
return ray_color(Ray.init(rec.p, target.sub(rec.p)), world, depth - 1).scale(0.5); return ray_color(Ray.init(rec.p, target.sub(rec.p)), world, depth - 1).scale(0.5);
} }
var unit_direction = r.direction().unit(); var unit_direction = r.direction().unit();

8
zigrtiow/src/vec.zig
View File

@ -64,6 +64,14 @@ pub fn random_in_unit_sphere() Vec3 {
pub fn random_unit_vector() Vec3 { pub fn random_unit_vector() Vec3 {
return random_in_unit_sphere().unit(); return random_in_unit_sphere().unit();
} }
pub fn random_in_hemisphere(normal: Vec3) Vec3 {
const in_unit_sphere = random_in_unit_sphere();
if (in_unit_sphere.dot(normal) > 0.0) { // In the same hemisphere as the normal
return in_unit_sphere;
} else {
return in_unit_sphere.scale(-1);
}
}
pub const Color = Vec3; pub const Color = Vec3;
pub const Point3 = Vec3; pub const Point3 = Vec3;