Added hit stuff, but it doesn't work yet.

core/src/main/java/nl/andrewl/aos_core/Directions.java

@@ -0,0 +1,13 @@
+package nl.andrewl.aos_core;
+
+import org.joml.Vector3i;
+import org.joml.Vector3ic;
+
+public class Directions {
+	public static final Vector3ic UP = new Vector3i(0, 1, 0);
+	public static final Vector3ic DOWN = new Vector3i(0, -1, 0);
+	public static final Vector3ic NEGATIVE_X = new Vector3i(-1, 0, 0);
+	public static final Vector3ic POSITIVE_X = new Vector3i(1, 0, 0);
+	public static final Vector3ic NEGATIVE_Z = new Vector3i(0, 0, -1);
+	public static final Vector3ic POSITIVE_Z = new Vector3i(0, 0, 1);
+}

core/src/main/java/nl/andrewl/aos_core/model/Hit.java

@@ -0,0 +1,13 @@
+package nl.andrewl.aos_core.model;
+
+import org.joml.Vector3i;
+import org.joml.Vector3ic;
+
+/**
+ * Represents the point at which a ray hits a block, often used when casting a
+ * ray from a player's location to see if they break or place a block.
+ */
+public record Hit (
+		Vector3i pos,
+		Vector3ic norm
+) {}

core/src/main/java/nl/andrewl/aos_core/model/World.java

@@ -1,5 +1,6 @@
 package nl.andrewl.aos_core.model;
 
+import nl.andrewl.aos_core.Directions;
 import org.joml.Math;
 import org.joml.Vector3f;
 import org.joml.Vector3i;
@@ -95,7 +96,7 @@ public class World {
 	 * @return The location of the block that is looked at, or null if none
 	 * could be found.
 	 */
-	public Vector3i getLookingAtPos(Vector3f eyePos, Vector3f eyeDir, float limit) {
+	public Hit getLookingAtPos(Vector3f eyePos, Vector3f eyeDir, float limit) {
 		if (eyeDir.lengthSquared() == 0 || limit <= 0) return null;
 		Vector3f pos = new Vector3f(eyePos);
 		Vector3f movement = new Vector3f(); // Pre-allocate this vector.
@@ -120,11 +121,22 @@ public class World {
 			movement.set(eyeDir).mul(minFactor);
 			pos.add(movement);
 			if (getBlockAt(pos) > 0) {
-				return new Vector3i(
+				Vector3f prevPos = new Vector3f(pos).sub(movement);
+				Vector3i hitPos = new Vector3i(
 						(int) Math.floor(pos.x),
 						(int) Math.floor(pos.y),
 						(int) Math.floor(pos.z)
 				);
+				Vector3ic hitNorm = null;
+
+				if (prevPos.y > hitPos.y + 1) hitNorm = Directions.UP;
+				else if (prevPos.y < hitPos.y) hitNorm = Directions.DOWN;
+				else if (prevPos.x > hitPos.x + 1) hitNorm = Directions.POSITIVE_X;
+				else if (prevPos.x < hitPos.x) hitNorm = Directions.NEGATIVE_X;
+				else if (prevPos.z > hitPos.z + 1) hitNorm = Directions.POSITIVE_Z;
+				else if (prevPos.z < hitPos.z) hitNorm = Directions.NEGATIVE_Z;
+
+				return new Hit(hitPos, hitNorm);
 			}
 		}
 		return null;

core/src/main/java/nl/andrewl/aos_core/net/udp/ChunkUpdateMessage.java

@@ -1,6 +1,8 @@
 package nl.andrewl.aos_core.net.udp;
 
+import nl.andrewl.aos_core.model.World;
 import nl.andrewl.record_net.Message;
+import org.joml.Vector3i;
 
 /**
  * A message that's sent to clients when a block in a chunk is updated.
@@ -16,4 +18,14 @@ public record ChunkUpdateMessage(
 		int cx, int cy, int cz,
 		int lx, int ly, int lz,
 		byte newBlock
-) implements Message {}
+) implements Message {
+	public static ChunkUpdateMessage fromWorld(Vector3i worldPos, World world) {
+		Vector3i chunkPos = World.getChunkPosAt(worldPos);
+		Vector3i localPos = World.getLocalPosAt(worldPos);
+		return new ChunkUpdateMessage(
+				chunkPos.x, chunkPos.y, chunkPos.z,
+				localPos.x, localPos.y, localPos.z,
+				world.getBlockAt(worldPos.x, worldPos.y, worldPos.z)
+		);
+	}
+}

server/src/main/java/nl/andrewl/aos2_server/ServerPlayer.java

@@ -1,6 +1,5 @@
 package nl.andrewl.aos2_server;
 
-import nl.andrewl.aos_core.model.Chunk;
 import nl.andrewl.aos_core.model.Player;
 import nl.andrewl.aos_core.model.World;
 import nl.andrewl.aos_core.net.udp.ChunkUpdateMessage;
@@ -63,18 +62,25 @@ public class ServerPlayer extends Player {
 		if (lastInputState.hitting() && now - lastBlockRemovedAt > BLOCK_REMOVE_COOLDOWN) {
 			Vector3f eyePos = new Vector3f(position);
 			eyePos.y += getEyeHeight();
-			Vector3i targetPos = world.getLookingAtPos(eyePos, viewVector, 10);
+			var hit = world.getLookingAtPos(eyePos, viewVector, 10);
-			System.out.println(targetPos);
+			System.out.println(hit);
-			if (targetPos != null) {
+			if (hit != null) {
-				Vector3i chunkPos = World.getChunkPosAt(targetPos);
+				world.setBlockAt(hit.pos().x, hit.pos().y, hit.pos().z, (byte) 0);
-				Vector3i localPos = World.getLocalPosAt(targetPos);
-				world.setBlockAt(targetPos.x, targetPos.y, targetPos.z, (byte) 0);
 				lastBlockRemovedAt = now;
-				server.getPlayerManager().broadcastUdpMessage(new ChunkUpdateMessage(
+				server.getPlayerManager().broadcastUdpMessage(ChunkUpdateMessage.fromWorld(hit.pos(), world));
-						chunkPos.x, chunkPos.y, chunkPos.z,
+			}
-						localPos.x, localPos.y, localPos.z,
+		}
-						(byte) 0
+		if (lastInputState.interacting() && now - lastBlockRemovedAt > BLOCK_REMOVE_COOLDOWN) {
-				));
+			Vector3f eyePos = new Vector3f(position);
+			eyePos.y += getEyeHeight();
+			var hit = world.getLookingAtPos(eyePos, viewVector, 10);
+			System.out.println(hit);
+			if (hit != null) {
+				Vector3i placePos = new Vector3i(hit.pos());
+				placePos.add(hit.norm());
+				world.setBlockAt(placePos.x, placePos.y, placePos.z, (byte) 1);
+				lastBlockRemovedAt = now;
+				server.getPlayerManager().broadcastUdpMessage(ChunkUpdateMessage.fromWorld(placePos, world));
 			}
 		}
 		tickMovement(dt, world);