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Blockiterator fix 4 (#1513)
This commit is contained in:
iam
GitHub
parent
d496fcfe4a
commit
1a013728fd
@ -14,18 +14,84 @@ import java.util.NoSuchElementException;
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* This class performs ray tracing and iterates along blocks on a line
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*/
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public class BlockIterator implements Iterator<Point> {
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private final Vec direction;
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private final Point start;
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private final Point[] points = new Point[3];
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private final double[] distances = new double[3];
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private final short[] signums = new short[3];
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private final Vec end;
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private final boolean smooth;
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private boolean foundEnd = false;
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//length of ray from current position to next x or y-side
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double sideDistX;
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double sideDistY;
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double sideDistZ;
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//length of ray from one x or y-side to next x or y-side
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private final double deltaDistX;
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private final double deltaDistY;
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private final double deltaDistZ;
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//which box of the map we're in
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int mapX;
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int mapY;
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int mapZ;
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private final ArrayDeque<Point> extraPoints = new ArrayDeque<>();
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/**
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* Constructs the BlockIterator.
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* <p>
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* This considers all blocks as 1x1x1 in size.
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*
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* @param start A Vector giving the initial position for the trace
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* @param direction A Vector pointing in the direction for the trace
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* @param yOffset The trace begins vertically offset from the start vector
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* by this value
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* @param smooth A boolean indicating whether the cast should be smooth.
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* Smooth casts will only include one block when intersecting multiple axis lines.
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* @param maxDistance This is the maximum distance in blocks for the
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* trace. Setting this value above 140 may lead to problems with
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* unloaded chunks. A value of 0 indicates no limit
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*/
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public BlockIterator(@NotNull Vec start, @NotNull Vec direction, double yOffset, double maxDistance, boolean smooth) {
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start = start.add(0, yOffset, 0);
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end = start.add(direction.normalize().mul(maxDistance));
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if (direction.isZero()) this.foundEnd = true;
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this.smooth = smooth;
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Vec ray = direction.normalize();
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//which box of the map we're in
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mapX = start.blockX();
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mapY = start.blockY();
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mapZ = start.blockZ();
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signums[0] = (short) Math.signum(direction.x());
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signums[1] = (short) Math.signum(direction.y());
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signums[2] = (short) Math.signum(direction.z());
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deltaDistX = (ray.x() == 0) ? 1e30 : Math.abs(1 / ray.x());
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deltaDistY = (ray.y() == 0) ? 1e30 : Math.abs(1 / ray.y()); // Find grid intersections for x, y, z
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deltaDistZ = (ray.z() == 0) ? 1e30 : Math.abs(1 / ray.z()); // This works by calculating and storing the distance to the next grid intersection on the x, y and z axis
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//calculate step and initial sideDist
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if (ray.x() < 0) {
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sideDistX = (start.x() - mapX) * deltaDistX;
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} else {
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sideDistX = (mapX + 1.0 - start.x()) * deltaDistX;
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}
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if (ray.y() < 0) {
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sideDistY = (start.y() - mapY) * deltaDistY;
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} else {
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sideDistY = (mapY + 1.0 - start.y()) * deltaDistY;
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}
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if (ray.z() < 0) {
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sideDistZ = (start.z() - mapZ) * deltaDistZ;
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} else {
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sideDistZ = (mapZ + 1.0 - start.z()) * deltaDistZ;
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}
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}
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/**
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* Constructs the BlockIterator.
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* <p>
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@ -40,27 +106,7 @@ public class BlockIterator implements Iterator<Point> {
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* unloaded chunks. A value of 0 indicates no limit
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*/
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public BlockIterator(@NotNull Vec start, @NotNull Vec direction, double yOffset, double maxDistance) {
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this.direction = direction;
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this.start = start.add(0, yOffset, 0);
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this.end = start.add(0, yOffset, 0).add(direction.normalize().mul(maxDistance)).apply(Vec.Operator.FLOOR);
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if (this.direction.isZero()) this.foundEnd = true;
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signums[0] = (short) Math.signum(direction.x());
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signums[1] = (short) Math.signum(direction.y());
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signums[2] = (short) Math.signum(direction.z());
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// Find grid intersections for x, y, z
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// This works by calculating and storing the distance to the next grid intersection on the x, y and z axis
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// On every iteration, we return the nearest grid intersection and update it
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calculateIntersectionX(start, direction, signums[0] > 0 ? 1 : 0);
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calculateIntersectionY(start, direction, signums[1] > 0 ? 1 : 0);
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calculateIntersectionZ(start, direction, signums[2] > 0 ? 1 : 0);
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// If directions are 0, set distances to max to stop the intersection point from being used
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if (direction.x() == 0) distances[0] = Double.MAX_VALUE;
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if (direction.y() == 0) distances[1] = Double.MAX_VALUE;
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if (direction.z() == 0) distances[2] = Double.MAX_VALUE;
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this(start, direction, yOffset, maxDistance, false);
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}
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/**
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@ -77,7 +123,7 @@ public class BlockIterator implements Iterator<Point> {
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*/
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public BlockIterator(@NotNull Pos pos, double yOffset, int maxDistance) {
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this(pos.asVec(), pos.direction(), yOffset, maxDistance);
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this(pos.asVec(), pos.direction(), yOffset, maxDistance, false);
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}
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/**
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@ -91,7 +137,7 @@ public class BlockIterator implements Iterator<Point> {
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*/
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public BlockIterator(@NotNull Pos pos, double yOffset) {
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this(pos.asVec(), pos.direction(), yOffset, 0);
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this(pos.asVec(), pos.direction(), yOffset, 0, false);
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}
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/**
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@ -156,89 +202,54 @@ public class BlockIterator implements Iterator<Point> {
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@Override
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public Point next() {
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if (foundEnd) throw new NoSuchElementException();
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// If we have entries in the extra points queue, return those first
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var res = extraPoints.isEmpty() ? updateClosest() : extraPoints.poll();
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// If we have reached the end, set the flag
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if (res.sameBlock(end)) foundEnd = true;
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return new Vec(res.blockX(), res.blockY(), res.blockZ());
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}
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private void calculateIntersectionX(Point start, Vec direction, int signum) {
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double x = Math.floor(start.x()) + signum;
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double y = start.y() + (x - start.x()) * direction.y() / direction.x();
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double z = start.z() + (x - start.x()) * direction.z() / direction.x();
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points[0] = new Vec(x, y, z);
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distances[0] = this.start.distance(points[0]);
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}
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private void calculateIntersectionY(Point start, Vec direction, int signum) {
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double y = Math.floor(start.y()) + signum;
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double x = start.x() + (y - start.y()) * direction.x() / direction.y();
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double z = start.z() + (y - start.y()) * direction.z() / direction.y();
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points[1] = new Vec(x, y, z);
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distances[1] = this.start.distance(points[1]);
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}
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private void calculateIntersectionZ(Point start, Vec direction, int signum) {
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double z = Math.floor(start.z()) + signum;
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double x = start.x() + (z - start.z()) * direction.x() / direction.z();
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double y = start.y() + (z - start.z()) * direction.y() / direction.z();
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points[2] = new Vec(x, y, z);
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distances[2] = this.start.distance(points[2]);
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}
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private Point updateClosest() {
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// Find minimum distance
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double minDistance = Double.MAX_VALUE;
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for (int i = 0; i < 3; i++) {
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if (distances[i] < minDistance) {
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minDistance = distances[i];
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}
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if (!extraPoints.isEmpty()) {
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var res = extraPoints.poll();
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if (res.sameBlock(end)) foundEnd = true;
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return res;
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}
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int[] sub = new int[3];
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boolean needsX = Math.abs(distances[0] - minDistance) <= Vec.EPSILON;
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boolean needsY = Math.abs(distances[1] - minDistance) <= Vec.EPSILON;
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boolean needsZ = Math.abs(distances[2] - minDistance) <= Vec.EPSILON;
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var current = new Vec(mapX, mapY, mapZ);
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if (current.sameBlock(end)) foundEnd = true;
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double closest = Math.min(sideDistX, Math.min(sideDistY, sideDistZ));
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boolean needsX = sideDistX - closest < 1e-10;
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boolean needsY = sideDistY - closest < 1e-10;
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boolean needsZ = sideDistZ - closest < 1e-10;
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// Update all points that are minimum distance
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Point closest = null;
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if (needsX) {
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closest = points[0];
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if (signums[0] == 1) sub[0] = 1;
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calculateIntersectionX(points[0], direction, signums[0]);
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}
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if (needsY) {
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closest = points[1];
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if (signums[1] == 1) sub[1] = 1;
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calculateIntersectionY(points[1], direction, signums[1]);
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}
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if (needsZ) {
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closest = points[2];
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if (signums[2] == 1) sub[2] = 1;
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calculateIntersectionZ(points[2], direction, signums[2]);
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sideDistZ += deltaDistZ;
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mapZ += signums[2];
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}
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// If we pass a grid line in the positive direction, we subtract 1 to get the block we just passed over
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closest = closest.sub(sub[0], sub[1], sub[2]);
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if (needsX) {
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sideDistX += deltaDistX;
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mapX += signums[0];
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}
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if (needsY) {
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sideDistY += deltaDistY;
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mapY += signums[1];
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}
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// If multiple grid lines are cross at the same time, we need to add the blocks that are missed
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if (needsX && needsY && needsZ) {
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extraPoints.add(closest.add(signums[0], 0, 0));
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extraPoints.add(closest.add(0, signums[1], 0));
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extraPoints.add(closest.add(0, 0, signums[2]));
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extraPoints.add(new Vec(signums[0] + current.x(), current.y(), current.z()));
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if (smooth) return current;
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extraPoints.add(new Vec(current.x(), signums[1] + current.y(), current.z()));
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extraPoints.add(new Vec(current.x(), current.y(), signums[2] + current.z()));
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} else if (needsX && needsY) {
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extraPoints.add(closest.add(signums[0], 0, 0));
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extraPoints.add(closest.add(0, signums[1], 0));
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extraPoints.add(new Vec(signums[0] + current.x(), current.y(), current.z()));
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if (smooth) return current;
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extraPoints.add(new Vec(current.x(), signums[1] + current.y(), current.z()));
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} else if (needsX && needsZ) {
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extraPoints.add(closest.add(signums[0], 0, 0));
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extraPoints.add(closest.add(0, 0, signums[2]));
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extraPoints.add(new Vec(signums[0] + current.x(), current.y(), current.z()));
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if (smooth) return current;
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extraPoints.add(new Vec(current.x(), current.y(), signums[2] + current.z()));
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} else if (needsY && needsZ) {
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extraPoints.add(closest.add(0, signums[1], 0));
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extraPoints.add(closest.add(0, 0, signums[2]));
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extraPoints.add(new Vec(current.x(), signums[1] + current.y(), current.z()));
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if (smooth) return current;
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extraPoints.add(new Vec(current.x(), current.y(), signums[2] + current.z()));
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}
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return closest;
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return current;
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}
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}
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@ -82,6 +82,158 @@ public class BlockIteratorTest {
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assertFalse(iterator.hasNext());
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}
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@Test
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public void testLongDistance() {
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Vec s = new Vec(42.5, 0, 51.5);
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Vec e = new Vec(-12, 0, -36);
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BlockIterator iterator = new BlockIterator(s, e, 0, 37);
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List<Point> points = new ArrayList<>();
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while (iterator.hasNext()) {
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points.add(iterator.next());
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}
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Point[] validPoints = new Point[] {
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new Vec(42.0, 0.0, 51.0),
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new Vec(42.0, 0.0, 50.0),
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new Vec(41.0, 0.0, 50.0),
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new Vec(42.0, 0.0, 49.0),
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new Vec(41.0, 0.0, 49.0),
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new Vec(41.0, 0.0, 48.0),
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new Vec(41.0, 0.0, 47.0),
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new Vec(40.0, 0.0, 47.0),
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new Vec(41.0, 0.0, 46.0),
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new Vec(40.0, 0.0, 46.0),
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new Vec(40.0, 0.0, 45.0),
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new Vec(40.0, 0.0, 44.0),
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new Vec(39.0, 0.0, 44.0),
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new Vec(40.0, 0.0, 43.0),
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new Vec(39.0, 0.0, 43.0),
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new Vec(39.0, 0.0, 42.0),
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new Vec(39.0, 0.0, 41.0),
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new Vec(38.0, 0.0, 41.0),
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new Vec(39.0, 0.0, 40.0),
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new Vec(38.0, 0.0, 40.0),
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new Vec(38.0, 0.0, 39.0),
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new Vec(38.0, 0.0, 38.0),
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new Vec(37.0, 0.0, 38.0),
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new Vec(38.0, 0.0, 37.0),
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new Vec(37.0, 0.0, 37.0),
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new Vec(37.0, 0.0, 36.0),
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new Vec(37.0, 0.0, 35.0),
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new Vec(36.0, 0.0, 35.0),
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new Vec(37.0, 0.0, 34.0),
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new Vec(36.0, 0.0, 34.0),
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new Vec(36.0, 0.0, 33.0),
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new Vec(36.0, 0.0, 32.0),
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new Vec(35.0, 0.0, 32.0),
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new Vec(36.0, 0.0, 31.0),
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new Vec(35.0, 0.0, 31.0),
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new Vec(35.0, 0.0, 30.0),
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new Vec(35.0, 0.0, 29.0),
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new Vec(34.0, 0.0, 29.0),
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new Vec(35.0, 0.0, 28.0),
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new Vec(34.0, 0.0, 28.0),
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new Vec(34.0, 0.0, 27.0),
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new Vec(34.0, 0.0, 26.0),
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new Vec(33.0, 0.0, 26.0),
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new Vec(34.0, 0.0, 25.0),
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new Vec(33.0, 0.0, 25.0),
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new Vec(33.0, 0.0, 24.0),
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new Vec(33.0, 0.0, 23.0),
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new Vec(32.0, 0.0, 23.0),
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new Vec(33.0, 0.0, 22.0),
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new Vec(32.0, 0.0, 22.0),
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new Vec(32.0, 0.0, 21.0),
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new Vec(32.0, 0.0, 20.0),
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new Vec(31.0, 0.0, 20.0),
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new Vec(32.0, 0.0, 19.0),
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new Vec(31.0, 0.0, 19.0),
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new Vec(31.0, 0.0, 18.0),
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new Vec(31.0, 0.0, 17.0),
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new Vec(30.0, 0.0, 17.0),
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new Vec(31.0, 0.0, 16.0),
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new Vec(30.0, 0.0, 16.0)
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};
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for (Point p : validPoints) {
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assertContains(points, p);
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}
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assertEquals(validPoints.length, points.size());
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}
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@Test
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public void testSkipping() {
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Vec s = new Vec(0.5, 40, 0.5);
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Vec e = new Vec(27, 0, 21);
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BlockIterator iterator = new BlockIterator(s, e, 0, 34);
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List<Point> points = new ArrayList<>();
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while (iterator.hasNext()) {
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points.add(iterator.next());
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}
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Point[] validPoints = new Point[] {
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new Vec(0.0, 40.0, 0.0),
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new Vec(1.0, 40.0, 0.0),
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new Vec(1.0, 40.0, 1.0),
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new Vec(2.0, 40.0, 1.0),
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new Vec(2.0, 40.0, 2.0),
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new Vec(3.0, 40.0, 2.0),
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new Vec(3.0, 40.0, 3.0),
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new Vec(4.0, 40.0, 3.0),
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new Vec(5.0, 40.0, 3.0),
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new Vec(4.0, 40.0, 4.0),
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new Vec(5.0, 40.0, 4.0),
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new Vec(6.0, 40.0, 4.0),
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new Vec(6.0, 40.0, 5.0),
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new Vec(7.0, 40.0, 5.0),
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new Vec(7.0, 40.0, 6.0),
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new Vec(8.0, 40.0, 6.0),
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new Vec(8.0, 40.0, 7.0),
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new Vec(9.0, 40.0, 7.0),
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new Vec(10.0, 40.0, 7.0),
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new Vec(10.0, 40.0, 8.0),
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new Vec(11.0, 40.0, 8.0),
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new Vec(11.0, 40.0, 9.0),
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new Vec(12.0, 40.0, 9.0),
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new Vec(12.0, 40.0, 10.0),
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new Vec(13.0, 40.0, 10.0),
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new Vec(14.0, 40.0, 10.0),
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new Vec(13.0, 40.0, 11.0),
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new Vec(14.0, 40.0, 11.0),
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new Vec(15.0, 40.0, 11.0),
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new Vec(15.0, 40.0, 12.0),
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new Vec(16.0, 40.0, 12.0),
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new Vec(16.0, 40.0, 13.0),
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new Vec(17.0, 40.0, 13.0),
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new Vec(17.0, 40.0, 14.0),
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new Vec(18.0, 40.0, 14.0),
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new Vec(19.0, 40.0, 14.0),
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new Vec(19.0, 40.0, 15.0),
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new Vec(20.0, 40.0, 15.0),
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new Vec(20.0, 40.0, 16.0),
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new Vec(21.0, 40.0, 16.0),
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new Vec(21.0, 40.0, 17.0),
|
||||
new Vec(22.0, 40.0, 17.0),
|
||||
new Vec(23.0, 40.0, 17.0),
|
||||
new Vec(22.0, 40.0, 18.0),
|
||||
new Vec(23.0, 40.0, 18.0),
|
||||
new Vec(24.0, 40.0, 18.0),
|
||||
new Vec(24.0, 40.0, 19.0),
|
||||
new Vec(25.0, 40.0, 19.0),
|
||||
new Vec(25.0, 40.0, 20.0),
|
||||
new Vec(26.0, 40.0, 20.0),
|
||||
new Vec(26.0, 40.0, 21.0),
|
||||
new Vec(27.0, 40.0, 21.0)
|
||||
};
|
||||
|
||||
for (Point p : validPoints) {
|
||||
assertContains(points, p);
|
||||
}
|
||||
assertEquals(validPoints.length, points.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testExactEnd() {
|
||||
Vec s = new Vec(0.5, 0, 0.5);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user