32 lines
1.1 KiB
Java
32 lines
1.1 KiB
Java
package eu.jonahbauer.raytracing.material;
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import eu.jonahbauer.raytracing.math.Ray;
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import eu.jonahbauer.raytracing.math.Vec3;
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import eu.jonahbauer.raytracing.render.Color;
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import eu.jonahbauer.raytracing.scene.HitResult;
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import org.jetbrains.annotations.NotNull;
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import java.util.Objects;
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import java.util.Optional;
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public record MetallicMaterial(@NotNull Color albedo, double fuzz) implements Material {
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public MetallicMaterial(@NotNull Color albedo) {
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this(albedo, 0);
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}
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public MetallicMaterial {
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Objects.requireNonNull(albedo, "albedo");
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if (fuzz < 0 || !Double.isFinite(fuzz)) throw new IllegalArgumentException("fuzz must be non-negative");
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}
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@Override
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public @NotNull Optional<ScatterResult> scatter(@NotNull Ray ray, @NotNull HitResult hit) {
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var newDirection = Vec3.reflect(ray.direction(), hit.normal());
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if (fuzz > 0) {
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newDirection = newDirection.unit().plus(Vec3.random(true).times(fuzz));
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}
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return Optional.of(new ScatterResult(new Ray(hit.position(), newDirection), albedo));
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}
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}
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