Vibe code a forcefield renderer

.claude/settings.local.json

@@ -0,0 +1,11 @@
+{
+  "permissions": {
+    "allow": [
+      "WebSearch",
+      "Bash(./gradlew:*)",
+      "Bash(jar tf:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}

.gitignore

@@ -0,0 +1,11 @@
+.gradle/
+build/
+.idea/
+*.iml
+*.ipr
+*.iws
+out/
+bin/
+.classpath
+.project
+.settings/

README.md

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+# RegionForcefield
+
+A Minecraft plugin that renders visible particle forcefields around WorldGuard regions that players cannot enter.
+
+## Features
+
+- Automatically detects WorldGuard regions with `entry deny` flag
+- Renders particle forcefields only visible to players who cannot enter
+- Configurable particle color, size, spacing, and render distance
+- Supports cuboid and polygonal region types
+- Performance-optimized with distance-based rendering
+- Clean, readable, and well-documented code
+
+## Requirements
+
+- Paper 1.21.8 or higher
+- WorldGuard 7.0.14 or higher
+- Java 21
+
+## Installation
+
+1. Build the plugin:
+   ```bash
+   ./gradlew build
+   ```
+
+2. Copy `build/libs/RegionForcefield-1.0.0.jar` to your server's `plugins/` folder
+
+3. Restart your server
+
+4. Configure the plugin by editing `plugins/RegionForcefield/config.yml`
+
+## Usage
+
+Once installed, the plugin automatically works with your existing WorldGuard regions:
+
+1. Create a WorldGuard region: `/rg define myregion`
+2. Set the entry flag to deny: `/rg flag myregion entry deny`
+3. Players who cannot enter the region will see a cyan forcefield around it
+
+### Permissions
+
+Players who are members or owners of a region can enter it even if entry is denied for others. These players will not see the forcefield.
+
+## Configuration
+
+Edit `plugins/RegionForcefield/config.yml`:
+
+```yaml
+# Update frequency (20 ticks = 1 second)
+update-interval-ticks: 20
+
+# Maximum render distance in blocks
+max-render-distance: 100
+
+# Spacing between particles
+particle-spacing: 0.5
+
+# Render walls or just edges
+render-walls: true
+
+# Particle color (RGB 0-255)
+particle-color:
+  red: 0
+  green: 255
+  blue: 255
+
+# Particle size (0.5-2.0 recommended)
+particle-size: 1.0
+```
+
+## Performance Tips
+
+- Reduce `max-render-distance` for servers with many regions
+- Increase `particle-spacing` to reduce particle count
+- Set `render-walls: false` to only show edges
+- Increase `update-interval-ticks` if you don't need real-time updates
+
+## Building from Source
+
+```bash
+./gradlew build
+```
+
+The compiled JAR will be in `build/libs/`
+
+## License
+
+This project is provided as-is for educational purposes.
+
+## Support
+
+For issues or feature requests, please open an issue on the project repository.

build.gradle.kts

@@ -0,0 +1,44 @@
+plugins {
+    java
+    id("com.gradleup.shadow") version "9.2.2"
+}
+
+group = "loganintech"
+version = "1.0.0"
+
+repositories {
+    mavenCentral()
+    maven("https://repo.papermc.io/repository/maven-public/")
+    maven("https://maven.enginehub.org/repo/")
+}
+
+dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.21.8-R0.1-SNAPSHOT")
+    compileOnly("com.sk89q.worldguard:worldguard-bukkit:7.0.14")
+
+    implementation("org.jetbrains:annotations:24.1.0")
+}
+
+java {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
+}
+
+tasks {
+    shadowJar {
+        archiveClassifier.set("")
+        minimize()
+    }
+
+    processResources {
+        val props = mapOf("version" to version)
+        inputs.properties(props)
+        filteringCharset = "UTF-8"
+        filesMatching("plugin.yml") {
+            expand(props)
+        }
+    }
+
+    build {
+        dependsOn(shadowJar)
+    }
+}

gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx2G
+org.gradle.parallel=true
+org.gradle.caching=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "RegionForcefield"

src/main/java/loganintech/regionforcefield/RegionForcefieldPlugin.java

@@ -0,0 +1,65 @@
+package loganintech.regionforcefield;
+
+import loganintech.regionforcefield.forcefield.ForcefieldRenderer;
+import loganintech.regionforcefield.region.RegionPermissionChecker;
+import loganintech.regionforcefield.task.ForcefieldUpdateTask;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Main plugin class for RegionForcefield.
+ * Displays particle forcefields around WorldGuard regions that players cannot enter.
+ */
+public final class RegionForcefieldPlugin extends JavaPlugin {
+
+    private RegionPermissionChecker permissionChecker;
+    private ForcefieldRenderer forcefieldRenderer;
+    private ForcefieldUpdateTask updateTask;
+
+    @Override
+    public void onEnable() {
+        // Save default config
+        saveDefaultConfig();
+
+        // Initialize components
+        this.permissionChecker = new RegionPermissionChecker();
+        this.forcefieldRenderer = new ForcefieldRenderer(this);
+
+        // Start the periodic update task
+        this.updateTask = new ForcefieldUpdateTask(this, permissionChecker, forcefieldRenderer);
+        long updateInterval = getConfig().getLong("update-interval-ticks", 20L);
+        updateTask.runTaskTimer(this, 0L, updateInterval);
+
+        getLogger().info("RegionForcefield has been enabled!");
+    }
+
+    @Override
+    public void onDisable() {
+        // Cancel the update task
+        if (updateTask != null) {
+            updateTask.cancel();
+        }
+
+        getLogger().info("RegionForcefield has been disabled!");
+    }
+
+    /**
+     * Gets the region permission checker.
+     *
+     * @return the permission checker
+     */
+    @NotNull
+    public RegionPermissionChecker getPermissionChecker() {
+        return permissionChecker;
+    }
+
+    /**
+     * Gets the forcefield renderer.
+     *
+     * @return the forcefield renderer
+     */
+    @NotNull
+    public ForcefieldRenderer getForcefieldRenderer() {
+        return forcefieldRenderer;
+    }
+}

src/main/java/loganintech/regionforcefield/forcefield/ForcefieldRenderer.java

@@ -0,0 +1,208 @@
+package loganintech.regionforcefield.forcefield;
+
+import com.sk89q.worldedit.math.BlockVector2;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
+import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * Renders particle forcefields around protected regions.
+ */
+public class ForcefieldRenderer {
+
+    private final Plugin plugin;
+    private final double particleSpacing;
+    private final Particle.DustOptions dustOptions;
+
+    /**
+     * Creates a new forcefield renderer.
+     *
+     * @param plugin the plugin instance
+     */
+    public ForcefieldRenderer(@NotNull Plugin plugin) {
+        this.plugin = plugin;
+        this.particleSpacing = plugin.getConfig().getDouble("particle-spacing", 0.5);
+
+        // Get color from config or use default (cyan)
+        int red = plugin.getConfig().getInt("particle-color.red", 0);
+        int green = plugin.getConfig().getInt("particle-color.green", 255);
+        int blue = plugin.getConfig().getInt("particle-color.blue", 255);
+        float size = (float) plugin.getConfig().getDouble("particle-size", 1.0);
+
+        this.dustOptions = new Particle.DustOptions(Color.fromRGB(red, green, blue), size);
+    }
+
+    /**
+     * Renders a forcefield around a region for a specific player.
+     *
+     * @param player the player to show the forcefield to
+     * @param region the region to render
+     * @param world  the world the region is in
+     */
+    public void renderForcefield(@NotNull Player player, @NotNull ProtectedRegion region, @NotNull World world) {
+        if (region instanceof ProtectedCuboidRegion) {
+            renderCuboidForcefield(player, (ProtectedCuboidRegion) region, world);
+        } else if (region instanceof ProtectedPolygonalRegion) {
+            renderPolygonalForcefield(player, (ProtectedPolygonalRegion) region, world);
+        } else {
+            // For other region types, fall back to rendering a bounding box
+            renderBoundingBoxForcefield(player, region, world);
+        }
+    }
+
+    /**
+     * Renders a forcefield for a cuboid region.
+     */
+    private void renderCuboidForcefield(@NotNull Player player, @NotNull ProtectedCuboidRegion region, @NotNull World world) {
+        BlockVector3 min = region.getMinimumPoint();
+        BlockVector3 max = region.getMaximumPoint();
+
+        // Render vertical edges
+        renderVerticalEdges(player, world, min, max);
+
+        // Render horizontal edges at top and bottom
+        renderHorizontalEdges(player, world, min, max);
+
+        // Optionally render faces (walls)
+        if (plugin.getConfig().getBoolean("render-walls", true)) {
+            renderWalls(player, world, min, max);
+        }
+    }
+
+    /**
+     * Renders a forcefield for a polygonal region.
+     */
+    private void renderPolygonalForcefield(@NotNull Player player, @NotNull ProtectedPolygonalRegion region, @NotNull World world) {
+        List<BlockVector2> points = region.getPoints();
+        int minY = region.getMinimumPoint().y();
+        int maxY = region.getMaximumPoint().y();
+
+        // Render vertical walls between each pair of points
+        for (int i = 0; i < points.size(); i++) {
+            BlockVector2 point1 = points.get(i);
+            BlockVector2 point2 = points.get((i + 1) % points.size());
+
+            renderVerticalWall(player, world, point1.x(), point1.z(), point2.x(), point2.z(), minY, maxY);
+        }
+    }
+
+    /**
+     * Renders a bounding box forcefield for unsupported region types.
+     */
+    private void renderBoundingBoxForcefield(@NotNull Player player, @NotNull ProtectedRegion region, @NotNull World world) {
+        BlockVector3 min = region.getMinimumPoint();
+        BlockVector3 max = region.getMaximumPoint();
+
+        renderVerticalEdges(player, world, min, max);
+        renderHorizontalEdges(player, world, min, max);
+    }
+
+    /**
+     * Renders the vertical edges of a cuboid.
+     */
+    private void renderVerticalEdges(@NotNull Player player, @NotNull World world, @NotNull BlockVector3 min, @NotNull BlockVector3 max) {
+        // Four vertical edges
+        renderLine(player, world, min.x(), min.y(), min.z(), min.x(), max.y(), min.z());
+        renderLine(player, world, max.x(), min.y(), min.z(), max.x(), max.y(), min.z());
+        renderLine(player, world, min.x(), min.y(), max.z(), min.x(), max.y(), max.z());
+        renderLine(player, world, max.x(), min.y(), max.z(), max.x(), max.y(), max.z());
+    }
+
+    /**
+     * Renders the horizontal edges of a cuboid.
+     */
+    private void renderHorizontalEdges(@NotNull Player player, @NotNull World world, @NotNull BlockVector3 min, @NotNull BlockVector3 max) {
+        // Bottom edges
+        renderLine(player, world, min.x(), min.y(), min.z(), max.x(), min.y(), min.z());
+        renderLine(player, world, min.x(), min.y(), max.z(), max.x(), min.y(), max.z());
+        renderLine(player, world, min.x(), min.y(), min.z(), min.x(), min.y(), max.z());
+        renderLine(player, world, max.x(), min.y(), min.z(), max.x(), min.y(), max.z());
+
+        // Top edges
+        renderLine(player, world, min.x(), max.y(), min.z(), max.x(), max.y(), min.z());
+        renderLine(player, world, min.x(), max.y(), max.z(), max.x(), max.y(), max.z());
+        renderLine(player, world, min.x(), max.y(), min.z(), min.x(), max.y(), max.z());
+        renderLine(player, world, max.x(), max.y(), min.z(), max.x(), max.y(), max.z());
+    }
+
+    /**
+     * Renders the walls (faces) of a cuboid.
+     */
+    private void renderWalls(@NotNull Player player, @NotNull World world, @NotNull BlockVector3 min, @NotNull BlockVector3 max) {
+        // North wall (min Z)
+        renderVerticalWall(player, world, min.x(), min.z(), max.x(), min.z(), min.y(), max.y());
+
+        // South wall (max Z)
+        renderVerticalWall(player, world, min.x(), max.z(), max.x(), max.z(), min.y(), max.y());
+
+        // West wall (min X)
+        renderVerticalWall(player, world, min.x(), min.z(), min.x(), max.z(), min.y(), max.y());
+
+        // East wall (max X)
+        renderVerticalWall(player, world, max.x(), min.z(), max.x(), max.z(), min.y(), max.y());
+    }
+
+    /**
+     * Renders a vertical wall between two points.
+     */
+    private void renderVerticalWall(@NotNull Player player, @NotNull World world,
+                                    double x1, double z1, double x2, double z2,
+                                    double minY, double maxY) {
+        double distance = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(z2 - z1, 2));
+        int horizontalSteps = (int) Math.ceil(distance / particleSpacing);
+        int verticalSteps = (int) Math.ceil((maxY - minY) / particleSpacing);
+
+        for (int i = 0; i <= horizontalSteps; i++) {
+            double t = horizontalSteps > 0 ? (double) i / horizontalSteps : 0;
+            double x = x1 + (x2 - x1) * t;
+            double z = z1 + (z2 - z1) * t;
+
+            for (int j = 0; j <= verticalSteps; j++) {
+                double y = minY + (maxY - minY) * ((double) j / verticalSteps);
+                spawnParticle(player, world, x, y, z);
+            }
+        }
+    }
+
+    /**
+     * Renders a line of particles between two points.
+     */
+    private void renderLine(@NotNull Player player, @NotNull World world,
+                           double x1, double y1, double z1,
+                           double x2, double y2, double z2) {
+        double distance = Math.sqrt(
+            Math.pow(x2 - x1, 2) +
+            Math.pow(y2 - y1, 2) +
+            Math.pow(z2 - z1, 2)
+        );
+
+        int steps = (int) Math.ceil(distance / particleSpacing);
+
+        for (int i = 0; i <= steps; i++) {
+            double t = steps > 0 ? (double) i / steps : 0;
+            double x = x1 + (x2 - x1) * t;
+            double y = y1 + (y2 - y1) * t;
+            double z = z1 + (z2 - z1) * t;
+
+            spawnParticle(player, world, x, y, z);
+        }
+    }
+
+    /**
+     * Spawns a single particle at the specified location for a player.
+     */
+    private void spawnParticle(@NotNull Player player, @NotNull World world, double x, double y, double z) {
+        Location location = new Location(world, x, y, z);
+        player.spawnParticle(Particle.DUST, location, 1, 0, 0, 0, 0, dustOptions);
+    }
+}

src/main/java/loganintech/regionforcefield/region/RegionPermissionChecker.java

@@ -0,0 +1,74 @@
+package loganintech.regionforcefield.region;
+
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldguard.LocalPlayer;
+import com.sk89q.worldguard.WorldGuard;
+import com.sk89q.worldguard.bukkit.WorldGuardPlugin;
+import com.sk89q.worldguard.protection.flags.Flags;
+import com.sk89q.worldguard.protection.managers.RegionManager;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Checks whether players have permission to enter WorldGuard regions.
+ */
+public class RegionPermissionChecker {
+
+    /**
+     * Gets all regions in a world that the specified player cannot enter.
+     *
+     * @param player the player to check
+     * @param world  the world to check regions in
+     * @return a set of regions the player cannot enter
+     */
+    @NotNull
+    public Set<ProtectedRegion> getBlockedRegions(@NotNull Player player, @NotNull World world) {
+        Set<ProtectedRegion> blockedRegions = new HashSet<>();
+
+        // Get the region manager for this world
+        RegionManager regionManager = WorldGuard.getInstance()
+                .getPlatform()
+                .getRegionContainer()
+                .get(BukkitAdapter.adapt(world));
+
+        if (regionManager == null) {
+            return blockedRegions;
+        }
+
+        // Convert Bukkit player to WorldGuard LocalPlayer
+        LocalPlayer localPlayer = WorldGuardPlugin.inst().wrapPlayer(player);
+
+        // Check each region
+        for (ProtectedRegion region : regionManager.getRegions().values()) {
+            if (!canEnterRegion(localPlayer, region)) {
+                blockedRegions.add(region);
+            }
+        }
+
+        return blockedRegions;
+    }
+
+    /**
+     * Checks if a player can enter a specific region.
+     *
+     * @param player the player to check
+     * @param region the region to check
+     * @return true if the player can enter, false otherwise
+     */
+    private boolean canEnterRegion(@NotNull LocalPlayer player, @NotNull ProtectedRegion region) {
+        // Check the ENTRY flag
+        // If ENTRY is set to DENY, the player cannot enter unless they have bypass permissions
+        if (region.getFlag(Flags.ENTRY) == com.sk89q.worldguard.protection.flags.StateFlag.State.DENY) {
+            // Check if the player is a member or owner of the region
+            return region.isMember(player) || region.isOwner(player);
+        }
+
+        // If ENTRY is not explicitly denied, the player can enter
+        return true;
+    }
+}

src/main/java/loganintech/regionforcefield/task/ForcefieldUpdateTask.java

@@ -0,0 +1,82 @@
+package loganintech.regionforcefield.task;
+
+import loganintech.regionforcefield.RegionForcefieldPlugin;
+import loganintech.regionforcefield.forcefield.ForcefieldRenderer;
+import loganintech.regionforcefield.region.RegionPermissionChecker;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitRunnable;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Set;
+
+/**
+ * Periodic task that updates and renders forcefields for all online players.
+ */
+public class ForcefieldUpdateTask extends BukkitRunnable {
+
+    private final RegionForcefieldPlugin plugin;
+    private final RegionPermissionChecker permissionChecker;
+    private final ForcefieldRenderer forcefieldRenderer;
+    private final int maxRenderDistance;
+
+    /**
+     * Creates a new forcefield update task.
+     *
+     * @param plugin             the plugin instance
+     * @param permissionChecker  the permission checker
+     * @param forcefieldRenderer the forcefield renderer
+     */
+    public ForcefieldUpdateTask(@NotNull RegionForcefieldPlugin plugin,
+                                @NotNull RegionPermissionChecker permissionChecker,
+                                @NotNull ForcefieldRenderer forcefieldRenderer) {
+        this.plugin = plugin;
+        this.permissionChecker = permissionChecker;
+        this.forcefieldRenderer = forcefieldRenderer;
+        this.maxRenderDistance = plugin.getConfig().getInt("max-render-distance", 100);
+    }
+
+    @Override
+    public void run() {
+        // Iterate through all online players
+        for (Player player : plugin.getServer().getOnlinePlayers()) {
+            // Get all regions the player cannot enter in their current world
+            Set<ProtectedRegion> blockedRegions = permissionChecker.getBlockedRegions(player, player.getWorld());
+
+            // Render forcefields for nearby blocked regions
+            for (ProtectedRegion region : blockedRegions) {
+                if (isRegionNearPlayer(player, region)) {
+                    forcefieldRenderer.renderForcefield(player, region, player.getWorld());
+                }
+            }
+        }
+    }
+
+    /**
+     * Checks if a region is near enough to a player to render.
+     *
+     * @param player the player
+     * @param region the region
+     * @return true if the region should be rendered for this player
+     */
+    private boolean isRegionNearPlayer(@NotNull Player player, @NotNull ProtectedRegion region) {
+        // Get player's position
+        double playerX = player.getLocation().getX();
+        double playerY = player.getLocation().getY();
+        double playerZ = player.getLocation().getZ();
+
+        // Get region's center (approximate)
+        double regionCenterX = (region.getMinimumPoint().x() + region.getMaximumPoint().x()) / 2.0;
+        double regionCenterY = (region.getMinimumPoint().y() + region.getMaximumPoint().y()) / 2.0;
+        double regionCenterZ = (region.getMinimumPoint().z() + region.getMaximumPoint().z()) / 2.0;
+
+        // Calculate distance
+        double distance = Math.sqrt(
+            Math.pow(playerX - regionCenterX, 2) +
+            Math.pow(playerY - regionCenterY, 2) +
+            Math.pow(playerZ - regionCenterZ, 2)
+        );
+
+        return distance <= maxRenderDistance;
+    }
+}

src/main/resources/config.yml

@@ -0,0 +1,25 @@
+# RegionForcefield Configuration
+
+# How often to update forcefields (in ticks, 20 ticks = 1 second)
+update-interval-ticks: 20
+
+# Maximum distance (in blocks) at which forcefields will be rendered
+# Reducing this can improve performance on servers with many regions
+max-render-distance: 100
+
+# Distance between particles (in blocks)
+# Smaller values = more particles = more detailed forcefields but more performance intensive
+particle-spacing: 0.5
+
+# Whether to render the walls (faces) of regions, or just the edges
+# Setting to false will only render the outlines/edges
+render-walls: true
+
+# Particle color (RGB values from 0-255)
+particle-color:
+  red: 0
+  green: 255
+  blue: 255
+
+# Particle size (recommended range: 0.5 to 2.0)
+particle-size: 1.0

src/main/resources/plugin.yml

@@ -0,0 +1,8 @@
+name: RegionForcefield
+version: ${version}
+main: loganintech.regionforcefield.RegionForcefieldPlugin
+api-version: '1.21'
+depend: [WorldGuard]
+author: loganintech
+description: Renders visible forcefields around WorldGuard regions that players cannot enter
+website: https://github.com/loganintech