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add metal fuzz

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This commit is contained in:
jbb01 2024-08-03 21:37:44 +02:00
parent a41b14da48
commit ca769c56b2
3 changed files with 18 additions and 6 deletions
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4
src/main/java/eu/jonahbauer/raytracing/Main.java
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@ -16,8 +16,8 @@ public class Main {
var scene = new Scene(
new Sphere(0, -100.5, 1, 100, new LambertianMaterial(new Color(0.8, 0.8, 0.0))),
new Sphere(0, 0, 1.2, 0.5, new LambertianMaterial(new Color(0.1, 0.2, 0.5))),
new Sphere(-1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.8, 0.8))),
new Sphere(1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.6, 0.2)))
new Sphere(-1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.8, 0.8), 0.3)),
new Sphere(1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.6, 0.2), 1.0))
);
var camera = new Camera(512, 2, 16 / 9d);

16
src/main/java/eu/jonahbauer/raytracing/material/MetallicMaterial.java
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@ -1,6 +1,7 @@
package eu.jonahbauer.raytracing.material;
import eu.jonahbauer.raytracing.math.Ray;
import eu.jonahbauer.raytracing.math.Vec3;
import eu.jonahbauer.raytracing.render.Color;
import eu.jonahbauer.raytracing.scene.HitResult;
import org.jetbrains.annotations.NotNull;
@ -8,16 +9,23 @@ import org.jetbrains.annotations.NotNull;
import java.util.Objects;
import java.util.Optional;
public record MetallicMaterial(@NotNull Color albedo) implements Material {
public record MetallicMaterial(@NotNull Color albedo, double fuzz) implements Material {
public MetallicMaterial(@NotNull Color albedo) {
this(albedo, 0);
}
public MetallicMaterial {
Objects.requireNonNull(albedo, "albedo");
if (fuzz < 0 || !Double.isFinite(fuzz)) throw new IllegalArgumentException("fuzz must be non-negative");
}
@Override
public @NotNull Optional<ScatterResult> scatter(@NotNull Ray ray, @NotNull HitResult hit) {
var direction = ray.direction();
var normal = hit.normal();
var newDirection = direction.minus(normal.times(2 * normal.times(direction)));
var newDirection = Vec3.reflect(ray.direction(), hit.normal());
if (fuzz > 0) {
newDirection = newDirection.unit().plus(Vec3.random(true).times(fuzz));
}
return Optional.of(new ScatterResult(new Ray(hit.position(), newDirection), albedo));
}
}

4
src/main/java/eu/jonahbauer/raytracing/math/Vec3.java
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@ -27,6 +27,10 @@ public record Vec3(double x, double y, double z) {
return unit ? random.unit() : random;
}
public static @NotNull Vec3 reflect(@NotNull Vec3 vec, @NotNull Vec3 normal) {
return vec.minus(normal.times(2 * normal.times(vec)));
}
public @NotNull Vec3 plus(@NotNull Vec3 b) {
return new Vec3(this.x + b.x, this.y + b.y, this.z + b.z);
}