/godot-3d-essentials

name: godot-3d-essentials
description: >
  Set up a Godot 4.7 3D scene: Node3D transforms, Camera3D, lighting
  (DirectionalLight3D/OmniLight3D), WorldEnvironment for sky/ambient/tonemap/post,
  MeshInstance3D materials, and GridMap for tile-based 3D levels. Use when building
  a 3D scene in a Godot project, placing cameras/lights, configuring environment and
  post-processing, or working with Node3D/.tscn 3D content and GridMap.

Godot 3D Essentials (4.x)

Assemble a working 3D scene: transforms, camera, lights, environment/post, materials, and `GridMap` blockouts. Targets **Godot 4.7**.

When to use

• Use when starting or fixing a 3D scene: positioning a `Camera3D`, adding lights, setting

up a `WorldEnvironment` (sky, ambient, tonemap, glow/SSAO), assigning materials, or building levels with `GridMap`.

**When *not* to use:** writing spatial shaders → `godot-shaders`; 3D physics bodies and raycasts → `godot-physics`; character animation blending → `godot-animation`; full FPS template → the `fps-shooter` genre skill.

Core workflow

1. **Everything 3D is a `Node3D`** with a `Transform3D` (position, rotation basis, scale). Move with `global_position`, rotate with `rotate_y(angle)` or `look_at(target)`. 2. **Add a `Camera3D`.** Mark it `current` (or call `make_current()`); set `fov`, `near`, `far`. Parent it to a rig/pivot for orbit or follow cameras. 3. **Light the scene.** A `DirectionalLight3D` is the sun; `OmniLight3D`/`SpotLight3D` are local. Enable shadows per light. Without lights and ambient, surfaces render black. 4. **Add a `WorldEnvironment`** with an `Environment` resource: background (sky/color), ambient light, tonemap, and post (glow, SSAO, fog, adjustments). 5. **Give meshes materials** (`StandardMaterial3D` or a `ShaderMaterial`) on `MeshInstance3D`. 6. **Block out levels with `GridMap`**, which places `MeshLibrary` items on a 3D grid (the 3D analog of a tilemap).

Patterns

1. A follow camera (third-person, smoothed)

extends Camera3D

@export var target: Node3D
@export var offset := Vector3(0, 4, 8)
@export var smooth := 6.0

func _physics_process(delta: float) -> void:
    if target == null:
        return
    var desired := target.global_position + offset
    global_position = global_position.lerp(desired, smooth * delta)  # smooth follow
    look_at(target.global_position, Vector3.UP)                      # face the target

2. Sun + environment in code

func _ready() -> void:
    var sun := DirectionalLight3D.new()
    sun.rotation_degrees = Vector3(-45, -30, 0)
    sun.shadow_enabled = true
    add_child(sun)

    var we := WorldEnvironment.new()
    var env := Environment.new()
    env.background_mode = Environment.BG_SKY
    env.sky = Sky.new()
    env.sky.sky_material = ProceduralSkyMaterial.new()
    env.ambient_light_source = Environment.AMBIENT_SOURCE_SKY
    env.tonemap_mode = Environment.TONE_MAPPER_FILMIC
    env.glow_enabled = true
    we.environment = env
    add_child(we)

3. Assign a StandardMaterial3D from code

func tint_mesh(mesh: MeshInstance3D, color: Color) -> void:
    var mat := StandardMaterial3D.new()
    mat.albedo_color = color
    mat.metallic = 0.0
    mat.roughness = 0.6
    mat.emission_enabled = true
    mat.emission = color * 0.3
    mesh.material_override = mat       # overrides the mesh's surface materials

4. Place tiles into a GridMap

@onready var grid: GridMap = $GridMap   # cell_size + mesh_library set in the editor

func build_floor(width: int, depth: int, item_id: int) -> void:
    for x in width:
        for z in depth:
            # set_cell_item(Vector3i cell, int item, orientation = 0)
            grid.set_cell_item(Vector3i(x, 0, z), item_id)

Pitfalls

• **Scene renders black** → no lights and no ambient. Add a `DirectionalLight3D` and/or a

`WorldEnvironment` with ambient/sky. New scenes have neither by default.

• **No camera / wrong camera.** If nothing shows, no `Camera3D` is `current`. Set

`current = true` or `make_current()`; only one camera renders per viewport.

• **Confusing local vs global transforms.** `position`/`rotation` are relative to the

parent; `global_position`/`global_transform` are world space. Mixing them under a rotated parent gives surprising results. `look_at` uses global coordinates.

• **Scaling physics/lights.** Non-uniform `scale` on a `Node3D` distorts child collisions

and lights; prefer scaling the mesh asset or using uniform scale.

• **Forgetting `from`/`up` in `look_at`.** `look_at(target, up)` — a target equal to the

node's position, or an `up` parallel to the look direction, produces NaNs/flips.

• **GridMap with no `MeshLibrary`** places nothing. Create a `MeshLibrary` (from scenes)

and assign it; `set_cell_item(cell, -1)` clears a cell.

• **HDR/glow too strong** → check `tonemap_mode` and glow thresholds; raw emissive values

bloom hard under filmic tonemapping.

References

• For Transform3D math, camera projection modes, light/shadow params, the full

Environment/post-processing options, `MeshLibrary` creation, and `ReflectionProbe`/ `LightmapGI` lighting, read `references/scene-and-environment.md`.

Related skills

• `godot-physics` — 3D bodies, areas, and raycasts.
• `godot-shaders` — spatial shaders for custom 3D surfaces.
• `godot-animation` — `AnimationTree` for 3D characters.
• `camera-systems` — third-person orbit / first-person look rigs, framing, and collision.
• `performance-optimization` — keep 3D scenes within frame budget (draw calls, lights, LOD).
• `fps-shooter` — composes 3D movement, input, and AI into a game.