Graveyard
Waves

01 The look

One image sets the look

The first Scenario run was a single style frame: a small night graveyard arena in chunky low-poly shapes, a purple night, warm lanterns. Every concept after it used this frame as a reference image, so the crypt, the zombies and the weapons share one look.

Image · GPT Image 2.5 Sunburst

Run 1, 11:32

Key art for a stylized low-poly 3D game: a small night graveyard arena seen from a high three-quarter game camera. Flat-shaded faceted geometry with large clean polygons and chunky, slightly exaggerated proportions, like a polished low-poly mobile game. Rounded and cross-shaped gravestones in cold blue-grey stone, a small stone crypt with a dark wooden door and a pointed roof, twisted leafless dead trees, patches of dark moss-green grass on a dirt clearing, a few warm orange candle lanterns. A big pale moon and a deep indigo-violet sky with soft clouds. Limited palette: indigo night, blue-grey stone, moss green, warm orange accents. Soft moonlight from the upper left, gentle ambient occlusion, no textures beyond flat colour per face, no characters, no text.

Copy the prompt

02 The world

From concept to game mesh

Each prop started as a concept on a plain background, then went to image-to-3D with a triangle budget sized to its job: 700 for a grass tuft, 1,500 for a gravestone, 6,000 for the crypt. Open any piece to turn it in 3D and read its prompts.

1. 1 · Concept · GPT Image 2.5 Sunburst

   

2. 2 · 3D mesh · Meshy T2.5 Smart Topology · 6,000 triangles

3. 3 · In the game · Roblox Studio

   

The props

Gravestone A

1,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Gravestone B

1,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Gravestone C

1,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Crypt

6,000 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Dead tree

3,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Crooked tree

2,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Lantern post

1,800 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Fence

1,500 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Rocks

1,400 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Grass tuft

700 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Shelter stone

3,000 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Health potion

1,200 triangles

GPT Image 2.5 Sunburst →, then Meshy T2.5 Smart Topology

3D Prompts ↗

Sky · Scenario Skybox GPT

One 360 night sky

A single panorama wraps the arena: low-poly clouds, distant hills and a full moon. The game maps it onto the Roblox sky.

Look around

Prompt ↗

Ground · three models, one shoot-out

The ground took a shoot-out

The first tiling model wrote text into its tiles twice. Two more models got the same brief: PATINA Material won the grass, GPT Image 2.5 Sunburst made a seamless dirt. Both were graded darker for the night.

• Ideogram V4 Tiling
  text in the tile
• PATINA Material
  grass, the pick
• GPT Image 2.5 Sunburst
  dirt, the pick
• In the game
  graded darker

PATINA prompt ↗Dirt prompt ↗Ideogram prompt ↗

03 The undead

Rigged and animated on Scenario

Four kinds of zombie, each a concept, a 5,000-triangle mesh, then one rig and a set of library motions from Meshy Animation. In the game each rig runs at about 2,500 triangles and 24 bones. Pick one and play the clips the game uses.

WalkerRunnerGhoulBloater

Walker

The first wave. Slow, steady, arms out.

Walk 4.83 sRun 0.57 sAttack 2.13 sHit 0.83 sDeath 2.23 sRise 2.23 s

Concept GPT Image 2.5 SunburstMesh Meshy T2.5 Smart Topology · 5,000 trianglesRig and clips Meshy Animation

Prompts and motions ↗

The walk shoot-out

Three walks on the same zombie, side by side. The stagger with arms out read as a zombie from any angle and won. The chase uses a sprint blended with the walk by speed.

• 

  Meshy Animation · mummy stagger The pick: reads as a zombie, arms forward.

• 

  Cartwheel Text to Motion · from a prompt Runner-up: too hunched for a shambling walker.

• 

  Meshy Animation · monster walk Dropped: the body turns sideways as it walks.

04 The arsenal

One weapon per wave

Sword, scythe, hammer, spear. Each is a 1,500-triangle mesh, and each swing is a Meshy Animation clip retargeted to the Roblox avatar. Clear a wave and the next weapon unlocks.

Sword

Unlocked from the start.

Concept GPT Image 2.5 SunburstMesh Meshy T2.5 Smart Topology · 1,500 trianglesSwing Meshy Animation · Right-hand sword slash, 1.17 s

3D Prompts ↗

Scythe

Won by clearing a round.

Concept GPT Image 2.5 SunburstMesh Meshy T2.5 Smart Topology · 1,500 trianglesSwing Meshy Animation · Reaping swing, 0.47 s

3D Prompts ↗

War hammer

Won by the next victory.

Concept GPT Image 2.5 SunburstMesh Meshy T2.5 Smart Topology · 1,500 trianglesSwing Meshy Animation · Heavy hammer swing, 0.93 s

3D Prompts ↗

Spear

The last unlock.

Concept GPT Image 2.5 SunburstMesh Meshy T2.5 Smart Topology · 1,500 trianglesSwing Meshy Animation · Thrust slash, 0.67 s

3D Prompts ↗

VFX · GPT Image 2.5 Sunburst

Four frames of slash

One image holds the four frames of the sword slash. The game plays them as a flipbook on every swing.

Prompt ↗

HUD · GPT Image 2.5 Sunburst

Icons from one sheet

Health, the wave counter, zombies left and the attack button come from one 2x2 sheet, cut into cells. The scythe, hammer, spear and potion icons in the weapon bar are cut from their concepts.

Prompt ↗

05 Sound

Three takes, one pick

Every sound effect came from Mirelo SFX 2.0 in three takes. A check on loudness, onset and a transcription pass picked one take each. Play them all.

• Sword swing

  Take 1Take 2PickTake 3
  Prompt ↗

• Blade hits a zombie

  Take 1PickTake 2Take 3
  Prompt ↗

• Zombie hits the player

  Take 1Take 2PickTake 3
  Prompt ↗

• Zombie death

  Take 1 was dropped: a transcription pass heard words in it ("We're going away.").

  Take 1Take 2PickTake 3
  Prompt ↗

• Potion pickup

  Take 3 starts 0.38 s late, so take 2 won.

  Take 1Take 2PickTake 3
  Prompt ↗

One hook, six tracks

The whole score shares one hook: a four-note haunted organ riff, 128 BPM, A minor. ElevenLabs Music v2.5 made six tracks around it. Loops are cut on whole phrases, 16 or 24 bars, with seams a few milliseconds from the bar line.

• Between waves

  16 bars, a 30 s loop

  Prompt ↗

• Waves 1 and 2

  24 bars, a 45 s loop

  Prompt ↗

• Waves 3 and 4

  24 bars, a 45 s loop

  Prompt ↗

• Wave 5, the boss

  24 bars, a 45 s loop

  Prompt ↗

• Victory sting

  9 s sting

  Prompt ↗

• Game over sting

  6 s sting

  Prompt ↗

07 The build

Built in Roblox Studio by one agent

Claude Code ran the whole build with three tools: the Scenario MCP for every asset, the Roblox Studio MCP to build and playtest the place, and Scenario's Roblox skills for the craft. The first five playable waves ran about an hour after the first prompt.

• Agent

  Claude Code

  Opus 5.5. Wrote the Luau, chose the models, judged every capture.

• Assets

  Scenario MCP

  Searched the catalogue, ran 123 jobs, downloaded every result.

• Engine

  Roblox Studio MCP

  Built the place, ran code, started playtests and took the captures.

Coming to skills.sh

Fourteen Scenario Roblox skills

The agent worked from fourteen Scenario skills for Roblox, one per craft: rigs and clips, VFX and audio, UI, networking, performance and more. They are coming to skills.sh/scenario-labs/skills, next to Scenario's image, video, 3D and audio skills.

• scenario-roblox-expert
• scenario-roblox-architecture
• scenario-roblox-gameplay
• scenario-roblox-animation
• scenario-roblox-vfx-audio
• scenario-roblox-ui
• scenario-roblox-environment
• scenario-roblox-assets
• scenario-roblox-networking
• scenario-roblox-performance
• scenario-roblox-luau
• scenario-roblox-tooling
• scenario-roblox-data
• scenario-roblox-monetization

A playtest at every wave

The agent played each wave through the Roblox Studio MCP and read the captures before moving on. Open any of them.

What broke, and the fix

• The first rig was cut by hand

  The agent first split each zombie into rigid parts in code. The joints broke at every bend. It switched to Scenario's rigging and animation model: one skinned rig per character, then library motions.

• A tile with words in it

  Ideogram V4 Tiling wrote text into the ground tile twice. A shoot-out followed: PATINA Material won the grass, GPT Image 2.5 Sunburst made a seamless dirt tile, both graded darker.

• A groan that said something

  One zombie death take sounded like speech. A transcription pass heard “We're going away.” and the take was dropped for the next one.

• A model that ignored the tempo

  Asked for 128 BPM, the Lyria take came back at 89.1 BPM. The ElevenLabs take measured 129.2 BPM and won the track.

• Weapons held at odd angles

  A grip bench found three root causes: meshes off the grip axis, a jump at the start of each swing, and the avatar's proportions. Each got its own fix.

• Frames lost in wave 5

  A Highlight flash on every hit cost frames with a full horde on screen. A tint on the zombie's surface replaced it, and wave 5 then held 18.5 ms per frame (p95) in a Studio playtest.

• Out of editable memory

  Rebuilding every asset at runtime hit the editable memory budget, about 80 MB. Fixed-size copies and a serial build queue brought it back under.

08 The orchestration

Search, recommend, read the schema, run

For each kind of asset the agent asked the Scenario MCP the same four questions, then ran the pick. Here are the real calls for the 3D meshes.

1. 1 · search 9 calls

   search(target: "models", query: "3d",
          public: true, sort_by: "createdAt:desc")

   The newest 3D models first.

2. 2 · recommend 7 calls

   recommend(prompt: "Turn stylized low-poly game prop
     and character concept images into textured
     game-ready 3D meshes for Roblox")

   1 Meshy T2.5 Smart Topology, 2 Tripo P2, 3 Meshy 7.1, 4 Rodin Gen-2.5.

3. 3 · model_schema_get 19 calls

   model_schema_get(model_id:
     "model_meshy-t2-5-smart-topology")

   image [array], targetPolycount 100 to 30,000, shouldTexture, textureResolution.

4. 4 · model_run 123 runs

   model_run(model_id: "model_meshy-t2-5-smart-topology",
     parameters: { image: [concept], targetPolycount: 1500 })

   One job per asset, then jobs_wait and asset_download.

Twelve models

Runs and credits from the Scenario job records, for the game and both films: 3,766 credits in all. 2 image-to-3D runs failed with an internal error; they were refunded and the reruns succeeded.

• Image

  GPT Image 2.5 Sunburst

  Style frame, 20 concepts, HUD icons, slash sheet, 2 ground tiles

  25 runs · 391 credits

• 3D

  Meshy T2.5 Smart Topology

  Every game mesh, 20 assets

  22 runs · 1,200 credits

• Rig and motion

  Meshy Animation

  Four rigs, 38 motion clips

  38 runs · 1,216 credits

• Motion

  Cartwheel Text to Motion

  Walk shoot-out, runner-up

  1 run · 96 credits

• Sky

  Scenario Skybox GPT

  The 360 night sky

  1 run · 32 credits

• Texture

  PATINA Material

  Grass tile, shoot-out winner

  2 runs · 34 credits

• Texture

  Ideogram V4 Tiling

  Ground tiles, replaced

  2 runs · 168 credits

• SFX

  Mirelo SFX 2.0

  Game and film sound effects

  10 runs · 105 credits

• Music

  ElevenLabs Music v2.5

  Six game tracks

  6 runs · 180 credits

• Music

  ElevenLabs Music Advanced v2.5

  The film score

  2 runs · 120 credits

• Music

  Google Lyria 3.5

  Music shoot-out, runner-up

  1 run · 16 credits

• Voice

  ElevenLabs v4

  Film narration

  13 runs · 208 credits