PathForge Playground

Diagnose the empty path before blaming the pathfinder.

The playground turns common Godot navigation failures into named facts: start solid, goal solid, disconnected region, insufficient clearance, unsynced map, and custom blocker layouts. It also has a visual AStarGrid2D reference mode for the article's solid-cell, weight, diagonal, jumping, and heuristic gotchas.

Diagnostics Failure-mode cases Change case, press Play, and copy exact empty-path scenarios. AStarGrid2D Reference mode Drag start and goal, paint cells, then flip diagonal, jumping, and heuristic rules.

Loaded case

Edit

Ready to play the current case.

Simplified tile-by-tile illustration of Godot grid diagnostics - not the engine.

Agent

Goal

Blocked

Clearance

Searched

Route

Click cells to paint with the selected tool.

Start X Start Y Goal X Goal Y Agent System

Map synced Regions baked

Route data JSON

AStarGrid2D

Diagnostics workbench

DISCONNECTED_REGION

Start and goal are valid, but no connected route exists after the runtime blocker changes the grid.

Godot output and PathForge diagnosis

Godot raw output

get_id_path() -> []

PathForge output

reason = DISCONNECTED_REGION

Cheap facts checked first

Godot check snippet

Start: (2, 5)
Goal: (11, 5)
Agent: 1x1
Route: empty
Failing fact: blocked strip at x=6
Before search: start, goal, sync

Diagnostic report JSON

Captured Godot clip Six-second development capture of the diagnostic scene.

Download clip

Download Godot scene

Runnable Godot 4.6 mini project with the current reason-code helpers.

Benchmark JSON Measured local 64x64 diagnostics micro-benchmark.

{
  "article_slug": "godot-pathfinding-failure-modes",
  "generated_utc": "2026-06-08T11:19:07",
  "godot_version": "4.6.2-stable (official)",
  "measurement_scope": "Local diagnostic micro-benchmark for the PathForge for Godot development diagnostics scene. Not a product-wide PathForge performance benchmark.",
  "os_name": "Windows",
  "processor_name": "AMD Ryzen 5 2600X Six-Core Processor",
  "results": [
    {
      "average_usec": 7.3136,
      "case": "cheap_reject_goal_solid",
      "elapsed_usec": 73136,
      "grid_size": "64x64",
      "iterations": 10000,
      "notes": "Validate start/goal and return GOAL_SOLID before AStarGrid2D search."
    },
    {
      "average_usec": 381.342,
      "case": "raw_astargrid_allow_partial_solid_goal",
      "elapsed_usec": 381342,
      "grid_size": "64x64",
      "iterations": 1000,
      "notes": "Call AStarGrid2D.get_id_path(start, solid_goal, allow_partial_path=true)."
    },
    {
      "average_usec": 161.022,
      "case": "diagnose_disconnected_region",
      "elapsed_usec": 161022,
      "grid_size": "64x64",
      "iterations": 1000,
      "notes": "Validate then call AStarGrid2D once to classify a disconnected grid route."
    },
    {
      "average_usec": 3.941,
      "case": "navigationserver_unsynced_map_guard",
      "elapsed_usec": 39410,
      "grid_size": "64x64",
      "iterations": 10000,
      "notes": "Check NavigationServer2D.map_get_iteration_id(map) before path queries."
    }
  ]
}

Download JSON

AStarGrid2D reference mode

Drag start and goal, paint solid or weighted cells, and switch diagonal mode, jumping, and heuristics live.

Failure-Mode Museum

The shared vocabulary behind each named route failure.

Benchmark Lab

The first measured diagnostic micro-benchmark and broader measurement policy.

Moving 10,000 agents: interactive demo

Drag the goal and watch 10,000 agents hold the frame budget — the measured shared-field crowd benchmark, playable in the browser.

Godot 10,000-agent benchmark: the article

How per-agent path queries collapse the frame budget at 500 agents, and the shared field that scales to 10,000 — with native JSON and a runnable project.

Godot pathfinding failure modes: the article

The taxonomy behind this playground: every named empty-path reason, with the runnable scene and micro-benchmark.

Why is my path failing in Godot?

The triage checklist for empty paths, with verified Godot 4.6 proofs for the traps people actually hit.

PathForge product

The commercial product page, current V1 scope, and early access form.