Add physics-based player detection with field-of-view filtering

Replace distance-based opponent detection with physics sensors and
angle filtering for more realistic spatial awareness. Players now
detect nearby opponents/teammates through Phaser overlap zones with
180° forward field-of-view.

Key changes:
- Add detection sensor to Player with physics overlap tracking
- Add NEAR_PLAYER_DETECTION_ANGLE constant for FOV filtering
- Refactor PuckCarrierBehavior to use physics-based detection
- Add debug visualization showing detection arc (wedge shape)
- Fix TypeScript unused variable errors for production build

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/settings.local.json

@@ -3,7 +3,8 @@
     "allow": [
       "Bash(git add:*)",
       "Bash(git commit:*)",
-      "Bash(git push:*)"
+      "Bash(git push:*)",
+      "Bash(pnpm run:*)"
     ],
     "deny": [],
     "ask": []

src/config/constants.ts

@@ -73,6 +73,7 @@ export const GOALIE_RANGE = 3;                       // meters - how far goalie
 
 // Collision avoidance constants
 export const NEAR_PLAYER_DETECTION_RADIUS = 4;       // meters - radius to detect nearby players (threats, teammates, etc.)
+export const NEAR_PLAYER_DETECTION_ANGLE = Math.PI;  // radians (180 degrees) - field of view for detection (half-circle in front)
 export const EVASION_ANGLE = Math.PI / 3;            // radians (60 degrees) - angle to turn when evading
 
 // Tackle constants

src/entities/Player.ts

@@ -12,7 +12,8 @@ import {
   TACKLE_FALL_DURATION,
   PLAYER_ACCELERATION,
   PLAYER_DECELERATION,
-  NEAR_PLAYER_DETECTION_RADIUS
+  NEAR_PLAYER_DETECTION_RADIUS,
+  NEAR_PLAYER_DETECTION_ANGLE
 } from '../config/constants';
 import { CoordinateUtils } from '../utils/coordinates';
 import { MathUtils } from '../utils/math';
@@ -62,6 +63,12 @@ export class Player extends Phaser.GameObjects.Container {
   // Direction indicator
   private directionIndicator!: Phaser.GameObjects.Graphics;
 
+  // Nearby player detection (physics-based)
+  public detectionSensor?: Phaser.GameObjects.Zone;
+  public nearbyPlayers: Set<Player> = new Set();
+  public nearbyOpponents: Set<Player> = new Set();
+  public nearbyTeammates: Set<Player> = new Set();
+
   constructor(
     scene: Phaser.Scene,
     id: string,
@@ -288,6 +295,9 @@ export class Player extends Phaser.GameObjects.Container {
     this.gameX = gamePos.x;
     this.gameY = gamePos.y;
 
+    // Update detection sensor position
+    this.updateSensorPosition();
+
     // Update debug visualizations
     this.updateDebugVisuals();
   }
@@ -325,6 +335,74 @@ export class Player extends Phaser.GameObjects.Container {
     return this.currentSpeed;
   }
 
+  /**
+   * Create physics-based detection sensor for nearby players
+   * Call this after physics body is set up in GameScene.addPlayer()
+   */
+  public createDetectionSensor() {
+    // Create invisible zone for physics detection (no visual representation)
+    const sensorRadius = NEAR_PLAYER_DETECTION_RADIUS * SCALE;
+    const sensorDiameter = sensorRadius * 2;
+    this.detectionSensor = this.scene.add.zone(0, 0, sensorDiameter, sensorDiameter);
+
+    // Add physics to sensor
+    this.scene.physics.add.existing(this.detectionSensor);
+    const sensorBody = this.detectionSensor.body as Phaser.Physics.Arcade.Body;
+    sensorBody.setCircle(sensorRadius);
+
+    // Make it a sensor (no collision, only overlap detection)
+    sensorBody.enable = true;
+    sensorBody.setAllowGravity(false);
+
+    // Disable debug rendering for this physics body
+    sensorBody.debugShowBody = false;
+
+    // Position sensor at player location
+    this.updateSensorPosition();
+  }
+
+  /**
+   * Update sensor position to match player position
+   * Called every frame in update()
+   */
+  private updateSensorPosition() {
+    if (!this.detectionSensor) return;
+
+    const screenPos = CoordinateUtils.gameToScreen(this.scene, this.gameX, this.gameY);
+    this.detectionSensor.setPosition(screenPos.x, screenPos.y);
+  }
+
+  /**
+   * Check if a player is within detection field of view (angle filtering)
+   * Returns true if player is within the detection arc in front
+   */
+  public isPlayerInDetectionRange(other: Player): boolean {
+    if (!this.nearbyPlayers.has(other)) return false;
+
+    // Calculate angle from this player to the other player
+    const angleToOther = Math.atan2(other.gameY - this.gameY, other.gameX - this.gameX);
+
+    // Calculate angle difference from current facing direction
+    const angleDiff = MathUtils.angleDifference(this.currentAngle, angleToOther);
+
+    // Check if within field of view (e.g., 180° = Math.PI for half-circle in front)
+    return Math.abs(angleDiff) <= NEAR_PLAYER_DETECTION_ANGLE / 2;
+  }
+
+  /**
+   * Get all opponents within detection range (filtered by angle)
+   */
+  public getDetectedOpponents(): Player[] {
+    return Array.from(this.nearbyOpponents).filter(p => this.isPlayerInDetectionRange(p));
+  }
+
+  /**
+   * Get all teammates within detection range (filtered by angle)
+   */
+  public getDetectedTeammates(): Player[] {
+    return Array.from(this.nearbyTeammates).filter(p => this.isPlayerInDetectionRange(p));
+  }
+
   /**
    * Update debug visualizations (target position, path line, and detection circle)
    */
@@ -361,8 +439,31 @@ export class Player extends Phaser.GameObjects.Container {
       targetScreen.y + markerSize
     );
 
-    // Draw near player detection circle (always visible in DEBUG mode)
-    this.debugDetectionCircle.lineStyle(2, 0xff00ff, 0.3); // Magenta circle with lower opacity
-    this.debugDetectionCircle.strokeCircle(playerScreen.x, playerScreen.y, NEAR_PLAYER_DETECTION_RADIUS * SCALE);
+    // Draw near player detection arc (field of view as a filled wedge)
+    const halfFOV = NEAR_PLAYER_DETECTION_ANGLE / 2;
+
+    // Convert game angle to screen angle (negate because screen Y is inverted)
+    const screenAngle = -this.currentAngle;
+    const startAngle = screenAngle - halfFOV;
+    const endAngle = screenAngle + halfFOV;
+
+    // Draw filled wedge showing field of view
+    this.debugDetectionCircle.fillStyle(0xff00ff, 0.1); // Magenta with low alpha
+    this.debugDetectionCircle.lineStyle(2, 0xff00ff, 0.4); // Magenta border
+
+    this.debugDetectionCircle.beginPath();
+    this.debugDetectionCircle.moveTo(playerScreen.x, playerScreen.y); // Start at player center
+    this.debugDetectionCircle.arc(
+      playerScreen.x,
+      playerScreen.y,
+      NEAR_PLAYER_DETECTION_RADIUS * SCALE,
+      startAngle,
+      endAngle,
+      false
+    );
+    this.debugDetectionCircle.lineTo(playerScreen.x, playerScreen.y); // Close the wedge
+    this.debugDetectionCircle.closePath();
+    this.debugDetectionCircle.fillPath();
+    this.debugDetectionCircle.strokePath();
   }
 }

src/game/GameScene.ts

@@ -132,10 +132,61 @@ export class GameScene extends Phaser.Scene {
     this.playerGroup.add(player);
     this.behaviorTrees.set(player.id, new BehaviorTree(player));
 
+    // Create detection sensor for this player
+    player.createDetectionSensor();
+
+    // Setup detection sensor overlaps with other players
+    this.setupPlayerDetection(player);
+
     // Add collision with all goal posts
     this.physics.add.collider(player, this.goalPostsGroup);
   }
 
+  /**
+   * Setup physics-based detection sensor overlaps for a player
+   */
+  setupPlayerDetection(player: Player) {
+    if (!player.detectionSensor) return;
+
+    // Setup overlap detection with all other players
+    this.physics.add.overlap(
+      player.detectionSensor,
+      this.playerGroup,
+      (_sensor, otherPlayer) => {
+        const other = otherPlayer as unknown as Player;
+
+        // Don't detect self
+        if (other.id === player.id) return;
+
+        // Add to nearby players set
+        player.nearbyPlayers.add(other);
+
+        // Categorize by team
+        if (other.team === player.team) {
+          player.nearbyTeammates.add(other);
+        } else {
+          player.nearbyOpponents.add(other);
+        }
+      }
+    );
+
+    // Important: Clear nearby players when they leave the sensor
+    // We need to check every frame and remove players no longer overlapping
+    this.events.on('update', () => {
+      if (!player.detectionSensor) return;
+
+      // Check each nearby player to see if still overlapping
+      player.nearbyPlayers.forEach(other => {
+        const overlapping = this.physics.overlap(player.detectionSensor!, other);
+        if (!overlapping) {
+          player.nearbyPlayers.delete(other);
+          player.nearbyOpponents.delete(other);
+          player.nearbyTeammates.delete(other);
+        }
+      });
+    });
+  }
+
   /**
    * Remove a player from the scene (can be called at any time for debugging)
    */
@@ -165,7 +216,7 @@ export class GameScene extends Phaser.Scene {
 
   private createPuck() {
     // Initialize puck at center ice (0, 0 in game coordinates)
-    this.puck = new Puck(this, 5, 0);
+    this.puck = new Puck(this, 5, 5);
 
     // Add collisions between puck and all goal posts with custom bounce handler
     this.physics.add.collider(this.puck, this.goalPostsGroup, this.handlePuckPostBounce, undefined, this);

src/systems/behaviors/offensive/PuckCarrierBehavior.ts

@@ -7,7 +7,6 @@ import {
   SHOOTING_ANGLE_THRESHOLD,
   CLOSE_RANGE_DISTANCE,
   CLOSE_RANGE_ANGLE_THRESHOLD,
-  NEAR_PLAYER_DETECTION_RADIUS,
   EVASION_ANGLE,
   DEBUG
 } from '../../../config/constants';
@@ -92,18 +91,19 @@ export class PuckCarrierBehavior extends BehaviorNode {
   }
 
   /**
-   * Detect opponents blocking the path to goal
+   * Detect opponents blocking the path to goal using physics-based detection
    * Returns evasion target if threat detected, null otherwise
    *
    * The player will maintain evasion as long as an opponent is:
-   * 1. Within the near player detection radius (close proximity)
+   * 1. Within the near player detection zone (physics sensor)
+   * 2. Within the field of view (angle-based filtering)
    *
    * Once an evasion direction is chosen, it persists until the opponent
    * leaves the threat zone to prevent direction flipping.
    */
   private detectImmediateThreat(
     player: Player,
-    gameState: GameState,
+    _gameState: GameState,
     opponentGoalX: number
   ): { approachAngle: number; evasionTargetX: number; evasionTargetY: number; evasionAngle: number } | null {
     // Get or create debug graphics for this player
@@ -126,7 +126,7 @@ export class PuckCarrierBehavior extends BehaviorNode {
     const goalY = 0;
     const toGoalAngle = Math.atan2(goalY - player.gameY, opponentGoalX - player.gameX);
 
-    // Draw debug line to goal (circle is now rendered by Player class)
+    // Draw debug line to goal (arc is now rendered by Player class)
     if (DEBUG && debugGraphics) {
       const playerScreen = CoordinateUtils.gameToScreen(player.scene, player.gameX, player.gameY);
       const goalScreen = CoordinateUtils.gameToScreen(player.scene, opponentGoalX, goalY);
@@ -134,17 +134,14 @@ export class PuckCarrierBehavior extends BehaviorNode {
       debugGraphics.lineBetween(playerScreen.x, playerScreen.y, goalScreen.x, goalScreen.y);
     }
 
-    // Find all opponents
-    const opponents = gameState.allPlayers.filter((p: Player) => p.team !== player.team);
+    // Get detected opponents (physics-based with angle filtering)
+    const detectedOpponents = player.getDetectedOpponents();
 
     // Check if we have any active evasions that are still valid
     for (const [opponentId, evasion] of playerEvasions.entries()) {
-      const opponent = opponents.find(opp => opp.id === opponentId);
+      const opponent = detectedOpponents.find(opp => opp.id === opponentId);
       if (opponent) {
-        const distanceToOpponent = MathUtils.distance(player.gameX, player.gameY, opponent.gameX, opponent.gameY);
-
-        // If opponent still in threat zone, maintain the evasion
-        if (distanceToOpponent <= NEAR_PLAYER_DETECTION_RADIUS) {
+        // Opponent still detected in threat zone, maintain the evasion
         const evasionAngle = evasion.side === 'left' ? toGoalAngle + EVASION_ANGLE : toGoalAngle - EVASION_ANGLE;
         const evasionDistance = 20;
         const evasionTargetX = player.gameX + Math.cos(evasionAngle) * evasionDistance;
@@ -184,25 +181,17 @@ export class PuckCarrierBehavior extends BehaviorNode {
         // Opponent left threat zone, clear the evasion
         playerEvasions.delete(opponentId);
       }
-      } else {
-        // Opponent no longer exists, clear the evasion
-        playerEvasions.delete(opponentId);
-      }
     }
 
     // No active evasions, check for new threats
-    for (const opponent of opponents) {
-      const distanceToOpponent = MathUtils.distance(player.gameX, player.gameY, opponent.gameX, opponent.gameY);
-
-      // Debug: Draw all opponents in threat zone
-      if (DEBUG && debugGraphics && distanceToOpponent <= NEAR_PLAYER_DETECTION_RADIUS) {
+    for (const opponent of detectedOpponents) {
+      // Debug: Draw all detected opponents
+      if (DEBUG && debugGraphics) {
         const opponentScreen = CoordinateUtils.gameToScreen(player.scene, opponent.gameX, opponent.gameY);
         debugGraphics.lineStyle(2, 0xffa500, 0.6); // Orange circle
         debugGraphics.strokeCircle(opponentScreen.x, opponentScreen.y, 12);
       }
 
-      // Check if opponent is within threat zone
-      if (distanceToOpponent <= NEAR_PLAYER_DETECTION_RADIUS) {
       // Calculate angle from player to opponent
       const angleToOpponent = Math.atan2(
         opponent.gameY - player.gameY,
@@ -260,7 +249,6 @@ export class PuckCarrierBehavior extends BehaviorNode {
         };
       }
     }
-    }
 
     return null;
   }