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add RandomGenerator parameter to Hittable#hit

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feature/spectral
jbb01 5 months ago
parent 9b72909d27
commit 871c837c34
11 changed files with 40 additions and 33 deletions
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2
src/main/java/eu/jonahbauer/raytracing/render/renderer/SimpleRenderer.java
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@ -128,7 +128,7 @@ public final class SimpleRenderer implements Renderer {
var attenuation = white;
while (depth-- > 0) {
var optional = scene.hit(ray);
var optional = scene.hit(ray, random);
if (optional.isEmpty()) {
var background = scene.getBackgroundColor(ray);
color = SampledSpectrum.fma(attenuation, background, color);

9
src/main/java/eu/jonahbauer/raytracing/scene/Hittable.java
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@ -9,15 +9,16 @@ import eu.jonahbauer.raytracing.scene.transform.Translate;
import org.jetbrains.annotations.NotNull;
import java.util.Optional;
import java.util.random.RandomGenerator;
public interface Hittable {
@NotNull Range FORWARD = new Range(0.001, Double.POSITIVE_INFINITY);
/**
* @see #hit(Ray, Range)
* @see #hit(Ray, Range, RandomGenerator)
*/
default @NotNull Optional<HitResult> hit(@NotNull Ray ray) {
return hit(ray, FORWARD);
default @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull RandomGenerator random) {
return hit(ray, FORWARD, random);
}
/**
@ -31,7 +32,7 @@ public interface Hittable {
* @return the result of the hit test, containing (among others) the value {@code t} such that {@code ray.at(t)} is
* a point on {@code this} hittable
*/
@NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range);
@NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @NotNull RandomGenerator random);
/**
* {@return the axis-aligned bounding box of this hittable}

5
src/main/java/eu/jonahbauer/raytracing/scene/Scene.java
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@ -12,6 +12,7 @@ import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.random.RandomGenerator;
public final class Scene extends HittableCollection {
private final @NotNull HittableCollection objects;
@ -42,8 +43,8 @@ public final class Scene extends HittableCollection {
}
@Override
public void hit(@NotNull Ray ray, @NotNull State state) {
objects.hit(ray, state);
public void hit(@NotNull Ray ray, @NotNull State state, @NotNull RandomGenerator random) {
objects.hit(ray, state, random);
}
@Override

4
src/main/java/eu/jonahbauer/raytracing/scene/hittable2d/Hittable2D.java
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@ -7,9 +7,11 @@ import eu.jonahbauer.raytracing.render.material.Material;
import eu.jonahbauer.raytracing.scene.HitResult;
import eu.jonahbauer.raytracing.scene.Hittable;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Objects;
import java.util.Optional;
import java.util.random.RandomGenerator;
public abstract class Hittable2D implements Hittable {
protected final @NotNull Vec3 origin;
@ -36,7 +38,7 @@ public abstract class Hittable2D implements Hittable {
}
@Override
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @Nullable RandomGenerator random) {
var denominator = ray.direction().dot(normal);
if (Math.abs(denominator) < 1e-8) return Optional.empty(); // parallel

8
src/main/java/eu/jonahbauer/raytracing/scene/hittable3d/Box.java
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@ -48,7 +48,7 @@ public final class Box implements Hittable, Target {
}
@Override
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @Nullable RandomGenerator random) {
// based on AABB#hit with additional detection of the side hit
var origin = ray.origin();
var direction = ray.direction();
@ -103,13 +103,13 @@ public final class Box implements Hittable, Target {
t = tmin;
side = entry;
frontFace = true;
material = materials[side.ordinal()];
material = materials[entry.ordinal()];
normal = side.normal;
} else if (range.surrounds(tmax) && materials[exit.ordinal()] != null) {
t = tmax;
side = exit;
frontFace = false;
material = materials[side.ordinal()];
material = materials[exit.ordinal()];
normal = side.normal.neg();
} else {
return Optional.empty();
@ -130,7 +130,7 @@ public final class Box implements Hittable, Target {
@Override
public double getProbabilityDensity(@NotNull Vec3 origin, @NotNull Vec3 direction) {
if (contains(origin)) return 1 / (4 * Math.PI);
if (hit(new Ray(origin, direction)).isEmpty()) return 0;
if (hit(new Ray(origin, direction), null).isEmpty()) return 0;
var solidAngle = 0d;
for (var s : Side.values()) {

9
src/main/java/eu/jonahbauer/raytracing/scene/hittable3d/ConstantMedium.java
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@ -10,15 +10,16 @@ import eu.jonahbauer.raytracing.scene.Hittable;
import org.jetbrains.annotations.NotNull;
import java.util.Optional;
import java.util.random.RandomGenerator;
public record ConstantMedium(@NotNull Hittable boundary, double density, @NotNull IsotropicMaterial material) implements Hittable {
@Override
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
var hit1 = boundary.hit(ray, Range.UNIVERSE);
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @NotNull RandomGenerator random) {
var hit1 = boundary.hit(ray, Range.UNIVERSE, random);
if (hit1.isEmpty()) return Optional.empty();
var hit2 = boundary.hit(ray, new Range(hit1.get().t() + 0.0001, Double.POSITIVE_INFINITY));
var hit2 = boundary.hit(ray, new Range(hit1.get().t() + 0.0001, Double.POSITIVE_INFINITY), random);
if (hit2.isEmpty()) return Optional.empty();
var tmin = Math.max(range.min(), hit1.get().t());
@ -28,7 +29,7 @@ public record ConstantMedium(@NotNull Hittable boundary, double density, @NotNul
var length = ray.direction().length();
var distance = length * (tmax - tmin);
var hitDistance = - Math.log(Math.random()) / density;
var hitDistance = - Math.log(random.nextDouble()) / density;
if (hitDistance > distance) return Optional.empty();
var t = tmin + hitDistance / length;

3
src/main/java/eu/jonahbauer/raytracing/scene/hittable3d/Sphere.java
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@ -9,6 +9,7 @@ import eu.jonahbauer.raytracing.scene.HitResult;
import eu.jonahbauer.raytracing.scene.Hittable;
import eu.jonahbauer.raytracing.scene.Target;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Objects;
import java.util.Optional;
@ -40,7 +41,7 @@ public final class Sphere implements Hittable, Target {
}
@Override
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
public @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @Nullable RandomGenerator random) {
var t = hit0(ray, range);
if (Double.isNaN(t)) return Optional.empty();

6
src/main/java/eu/jonahbauer/raytracing/scene/transform/Transform.java
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@ -2,10 +2,8 @@ package eu.jonahbauer.raytracing.scene.transform;
import eu.jonahbauer.raytracing.math.Range;
import eu.jonahbauer.raytracing.math.Ray;
import eu.jonahbauer.raytracing.math.Vec3;
import eu.jonahbauer.raytracing.scene.HitResult;
import eu.jonahbauer.raytracing.scene.Hittable;
import eu.jonahbauer.raytracing.scene.Target;
import org.jetbrains.annotations.NotNull;
import java.util.Objects;
@ -24,7 +22,7 @@ public abstract class Transform implements Hittable {
protected abstract @NotNull HitResult transform(@NotNull HitResult result);
@Override
public final @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
return object.hit(transform(ray), range).map(this::transform);
public final @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @NotNull RandomGenerator random) {
return object.hit(transform(ray), range, random).map(this::transform);
}
}

11
src/main/java/eu/jonahbauer/raytracing/scene/util/HittableBinaryTree.java
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@ -8,6 +8,7 @@ import org.jetbrains.annotations.Nullable;
import java.util.Comparator;
import java.util.List;
import java.util.random.RandomGenerator;
public final class HittableBinaryTree extends HittableCollection {
private final @Nullable Hittable left;
@ -46,17 +47,17 @@ public final class HittableBinaryTree extends HittableCollection {
}
@Override
public void hit(@NotNull Ray ray, @NotNull State state) {
public void hit(@NotNull Ray ray, @NotNull State state, @NotNull RandomGenerator random) {
if (!bbox.hit(ray, state.getRange())) return;
if (left instanceof HittableCollection coll) {
coll.hit(ray, state);
coll.hit(ray, state, random);
} else if (left != null) {
hit(state, ray, left);
hit(state, ray, left, random);
}
if (right instanceof HittableCollection coll) {
coll.hit(ray, state);
coll.hit(ray, state, random);
} else if (right != null) {
hit(state, ray, right);
hit(state, ray, right, random);
}
}

11
src/main/java/eu/jonahbauer/raytracing/scene/util/HittableCollection.java
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@ -8,20 +8,21 @@ import org.jetbrains.annotations.NotNull;
import java.util.Objects;
import java.util.Optional;
import java.util.random.RandomGenerator;
public abstract class HittableCollection implements Hittable {
@Override
public final @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range) {
public final @NotNull Optional<HitResult> hit(@NotNull Ray ray, @NotNull Range range, @NotNull RandomGenerator random) {
var state = new State(range);
hit(ray, state);
hit(ray, state, random);
return state.getResult();
}
public abstract void hit(@NotNull Ray ray, @NotNull State state);
public abstract void hit(@NotNull Ray ray, @NotNull State state, @NotNull RandomGenerator random);
protected static boolean hit(@NotNull State state, @NotNull Ray ray, @NotNull Hittable object) {
var r = object.hit(ray, state.range);
protected static boolean hit(@NotNull State state, @NotNull Ray ray, @NotNull Hittable object, @NotNull RandomGenerator random) {
var r = object.hit(ray, state.range, random);
if (r.isPresent()) {
if (state.range.surrounds(r.get().t())){
state.result = r.get();

5
src/main/java/eu/jonahbauer/raytracing/scene/util/HittableList.java
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@ -7,6 +7,7 @@ import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
import java.util.List;
import java.util.random.RandomGenerator;
public final class HittableList extends HittableCollection {
private final @NotNull List<Hittable> objects;
@ -22,8 +23,8 @@ public final class HittableList extends HittableCollection {
}
@Override
public void hit(@NotNull Ray ray, @NotNull State state) {
objects.forEach(object -> hit(state, ray, object));
public void hit(@NotNull Ray ray, @NotNull State state, @NotNull RandomGenerator random) {
objects.forEach(object -> hit(state, ray, object, random));
}
@Override

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