Better tile click detection

main.go

@@ -108,35 +108,69 @@ func DrawPlayer(player Player, model *rl.Model, mapGrid [][]Tile) {
 	}
 }
 
+// Helper function to test ray-box intersection (slab method)
+func RayIntersectsBox(ray rl.Ray, boxMin, boxMax rl.Vector3) bool {
+	tmin := (boxMin.X - ray.Position.X) / ray.Direction.X
+	tmax := (boxMax.X - ray.Position.X) / ray.Direction.X
+
+	if tmin > tmax {
+		tmin, tmax = tmax, tmin
+	}
+
+	tymin := (boxMin.Z - ray.Position.Z) / ray.Direction.Z
+	tymax := (boxMax.Z - ray.Position.Z) / ray.Direction.Z
+
+	if tymin > tymax {
+		tymin, tymax = tymax, tymin
+	}
+
+	if (tmin > tymax) || (tymin > tmax) {
+		return false
+	}
+
+	if tymin > tmin {
+		tmin = tymin
+	}
+	if tymax < tmax {
+		tmax = tymax
+	}
+
+	tzmin := (boxMin.Y - ray.Position.Y) / ray.Direction.Y
+	tzmax := (boxMax.Y - ray.Position.Y) / ray.Direction.Y
+
+	if tzmin > tzmax {
+		tzmin, tzmax = tzmax, tzmin
+	}
+
+	if (tmin > tzmax) || (tzmin > tmax) {
+		return false
+	}
+
+	return true
+}
+
 func GetTileAtMouse(mapGrid [][]Tile, camera *rl.Camera3D) (Tile, bool) {
 	if !rl.IsMouseButtonPressed(rl.MouseLeftButton) {
 		return Tile{}, false
 	}
 	mouse := rl.GetMousePosition()
-
-	// Unproject mouse coordinates to 3D ray
 	ray := rl.GetMouseRay(mouse, *camera)
 
-	// Calculate the distance from the camera to the ray's intersection with the ground plane (Y=0)
-	if ray.Direction.Y == 0 {
-		return Tile{}, false
-	}
-	dist := -ray.Position.Y / ray.Direction.Y
+	for x := 0; x < MapWidth; x++ {
+		for y := 0; y < MapHeight; y++ {
+			tile := mapGrid[x][y]
 
-	// Calculate the intersection point
-	intersection := rl.NewVector3(
-		ray.Position.X+ray.Direction.X*dist,
-		ray.Position.Y+ray.Direction.Y*dist,
-		ray.Position.Z+ray.Direction.Z*dist,
-	)
+			// Define the bounding box for each tile based on its position and height
+			tilePos := rl.NewVector3(float32(x*TileSize), tile.Height*TileHeight, float32(y*TileSize))
+			boxMin := rl.Vector3Subtract(tilePos, rl.NewVector3(TileSize/2, TileHeight/2, TileSize/2))
+			boxMax := rl.Vector3Add(tilePos, rl.NewVector3(TileSize/2, TileHeight/2, TileSize/2))
 
-	// Convert the intersection point to tile coordinates
-	tileX := int(intersection.X / float32(TileSize))
-	tileY := int(intersection.Z / float32(TileSize))
-
-	if tileX >= 0 && tileX < MapWidth && tileY >= 0 && tileY < MapHeight {
-		fmt.Println("Clicked:", tileX, tileY)
-		return mapGrid[tileX][tileY], true
+			// Check if the ray intersects the bounding box
+			if RayIntersectsBox(ray, boxMin, boxMax) {
+				fmt.Println("Clicked:", tile.X, tile.Y)
+				return tile, true
+			}
+		}
 	}
 	return Tile{}, false
 }
@@ -228,7 +262,7 @@ func UpdateCamera(camera *rl.Camera3D, player rl.Vector3, deltaTime float32) {
 }
 
 func main() {
-	rl.InitWindow(800, 600, "GoonScape")
+	rl.InitWindow(1024, 768, "GoonScape")
 	defer rl.CloseWindow()
 	rl.InitAudioDevice()
 	defer rl.CloseAudioDevice()