Create 3D Model (Geometry Only)

Build a 3D model's geometry in Blockbench. This skill creates the shape - use blockbench-texture afterward to add materials.

Overview

Interview the user about the model
Create the project (Hytale Prop format)
Build geometry (cubes and groups)
Verify with screenshots
Hand off to texture skill

Phase 1: Interview

Use AskUserQuestion to gather:

Required Information

Question	Example Answer
What is this model?	"A steam-powered generator"
Model name?	"fabrica_generator"
Approximate size?	"16x16x16 blocks"
Main components?	"base, body, chimney, control panel, vents"
Detail level?	Simple (5-10), Medium (10-25), Detailed (25+)

Component Naming Convention

Name components by their intended material for easy texturing later:

Prefix/Contains	Intended Material
`base_`, `frame_`, `trim_`	dark_iron
`body_`, `panel_`, `vent_`	steel
`dial_`, `switch_`, `pipe_`	copper
`fire_`, `glow_`, `heat_`	fire/emissive

Phase 2: Create Project

mcp__blockbench__create_project({
  name: "model_name",
  format: "hytale_prop"
})

Important: Close any other open projects first (single project rule).

Phase 3: Build Geometry

3.1 Create Root Group

mcp__blockbench__add_group({
  name: "root",
  origin: [0, 0, 0],
  rotation: [0, 0, 0]
})

3.2 Build Order

Base/frame - Bottom structural elements
Main body - Largest central volumes
Secondary shapes - Attached components
Detail pieces - Small trim, accents, controls

3.3 Place Cubes

mcp__blockbench__place_cube({
  elements: [
    { name: "base_plate", from: [-8, 0, -8], to: [8, 2, 8] },
    { name: "body_main", from: [-6, 2, -6], to: [6, 12, 6] }
  ],
  group: "root"
})

Geometry Guidelines

Guideline	Details
Coordinate system	Y is up, centered on origin
`from` / `to`	Min corner to max corner
Naming	Use material-indicative names
Batch placement	Place multiple cubes in one call when possible

3.4 Add Detail

For medium/detailed models, add:

Corner posts - Small vertical cubes at corners
Trim pieces - Thin horizontal cubes at edges
Vents/grills - Repeating thin cubes
Control panels - Recessed or protruding sections
Pipes/tubes - Cylindrical arrangements of cubes

Phase 4: Verify Geometry

Take Screenshots

mcp__blockbench__set_camera_angle({
  position: [30, 20, 30],
  target: [0, 8, 0],
  projection: "perspective"
})

mcp__blockbench__capture_screenshot()

Check from Multiple Angles

Front: position: [0, 10, 30]
Side: position: [30, 10, 0]
Top: position: [0, 40, 0]

Verify Element List

mcp__blockbench__list_outline()

Confirm all components are created with correct names.

Phase 5: Hand Off to Texturing

After geometry is complete, inform the user:

"Model geometry is complete with X elements. Use /blockbench-texture to create and apply materials."

Provide a summary of element names grouped by intended material:

Dark iron: base_plate, frame_front, trim_bottom...
Steel: body_main, panel_left, vent_1...
Copper: dial_1, switch_2, pipe_inlet...

DO NOT

Create textures (that's the texture skill's job)
Apply materials or set UVs
Use the texture parameter in place_cube

Quick Reference

Tool	Purpose
`create_project`	Start new Hytale Prop project
`add_group`	Create bone/group hierarchy
`place_cube`	Add geometry
`modify_cube`	Adjust existing cube
`list_outline`	Verify element names
`capture_screenshot`	Visual verification

blockbench-create-model