3Click Interior

3Click Interior is an in-editor level-design tool for Unity that lets you build complete, game-ready interiors — rooms, walls, doorways, windows, recesses and trim — directly in the Scene view. It pairs a click-and-drag modeling workflow with a non-destructive multi-layer surface painter, so you can block out a space in seconds and then dress every wall, floor and ceiling without ever leaving Unity.

No external DCC tool. No UV unwrapping. No manual prefab placement.

🚀 Quick Start Tutorial (3 Minutes)

1. Create: In the Hierarchy, choose GameObject → Interior Creator → Interior Modeler. This spawns an Interior Modeler object and activates the in-scene tool automatically. (See Two Ways to Start below for the toolbar method.)

2. Draw a Room: In the Scene view, drag on the ground plane to draw your first room. A single click drops a room at the default Width × Depth × Height shown in the overlay; drag for a custom footprint.

3. Add Openings: Click a wall to pop the Radial Menu, then flick toward one of four wedges — Add Room, Door, Window, or Open (full passage).

4. Shape It: Drag a wall handle to push/pull a wall, or Extrude a new connected room straight out of a wall face. Hold Ctrl and drag a shared corner to reshape connected rooms together.

5. Paint: Switch to 🎨 Painter Mode in the Inspector, pick a target surface (Floor / Wall / Ceiling / External Wall), choose a layer, and paint. Press Bake Static Prefab when you are happy to freeze it into an optimized asset.

That's it — a furnished, paintable room in three clicks.

🛠 Core Concepts

The Two Modes

The Inspector is split into two top-level modes you toggle at any time:

• 📐 Modeler Mode — everything structural: drawing rooms, moving walls, openings, extrudes, recesses, deformation, geometry settings.

• 🎨 Painter Mode — everything visual: layered materials, brushes, presets, dirt overlays.

Switching from Painter back to Modeler on a painted interior warns you first: geometry edits re-project existing paint onto the new shape (layers are preserved, but shared-perimeter wall tiling can shift). You can keep the paint or flatten it to a single clean layer.

The Room

The fundamental unit is a Room — a box defined by a footprint (center + size), a floor height, a wall height and a wall thickness. An interior is a list of rooms; connected rooms automatically share walls and stitch their geometry into one watertight shell.

Source-of-Truth Painting

Paint is non-destructive and resolution-independent of the geometry. Each room owns its own split-map texture, and every brush stroke is recorded in metres in a per-room stroke history. When you resize, extrude or deform a room, the texture is re-baked by replaying that history onto the new shape — so paint stays where you put it, even after heavy editing.

Surfaces & Layers

Every paintable surface kind — Floor, Wall, Ceiling, External Wall — carries up to 8 material layers. You paint a layer's influence into the surface; the shader blends the layers per-pixel. Each layer is a full PBR material (albedo, normal, mask, smoothness, metallic, tiling).

🧰 Two Ways to Start

Drawing rooms only works while the Interior Modeler tool is active. There are two equivalent ways to get there:

1. From the GameObject menu — GameObject → Interior Creator → Interior Modeler. This creates a fresh Interior Modeler and activates the tool in one step. Best for starting a brand-new interior.

2. From the Scene-view Tools column (left side) — with an Interior Modeler selected, click the Interior Modeler icon in the Scene view's left Tools overlay (the same column that holds Move / Rotate / Scale). It registers as a standard Unity Editor Tool, so it sits right alongside the built-in transform tools. You can also press Activate Interior Tool in the floating overlay panel.

Either way you end up in the same place: the tool is live, the Interior Modeler overlay panel appears, and dragging on the floor adds a room. Use the toolbar method to jump back into editing an interior you made earlier — there's no need to create a new object. Switching to any built-in tool (Move/Rotate/Scale) deactivates the modeler and returns Unity to normal object handling.

💡 The overlay panel that appears with the tool carries the New room size, Materials, Grid snapping, Presets and Rooms sections — it mirrors the Inspector so you can model without leaving the Scene view.

🧱 Modeler Mode Deep Dive

✏️ Drawing & Reshaping

• Draw: drag on the floor plane to create a room; click for the default size. Esc cancels a drag.

• Wall Push/Pull: hover a wall and drag it inward to shrink the room (or carve it) or outward to grow it — no need to select the room first.

• Default Size & Thickness: set the starting Width / Depth / Height and Wall thickness in the tool overlay.

🔘

 The Radial Menu

Click a wall enable grid on the wall and drag/ select grids to open radial menu:

Actions:

Add Room -Extrude a new connected room out of this wall (solid face-extrude).

Add Doors- Door-Cut a selected area and (optionally) drop a door-frame model.

Add Window- Cut a windowed opening at a sill height and drop a window model.

Open Segment- Open selected area

Extrude solid- Allows extrude the wall or ceiling/floors

Add Baseboards - Adds baseboard on the width selected area.

Remove Opening- Remove openings, doors, windows etc.

Add molding- Adds molding on the selected area width (under the ceiling)

Replace Doors- replece doors a new one.

🪟 Openings

Three opening kinds are supported: Window (sill above floor), Door (reaches the floor), and Passage (a clean cut, no frame). Openings between two adjacent rooms are created as a connected pair, so the jamb tunnel and the floor flow through cleanly from both sides. Each opening can carry an auto-fitted 3D model (see Fixtures).

➕ Extrude

• Wall Extrude (Solid): pull a new room out of a wall face — like a Blender face-extrude. Shared corners auto-align so the two rooms read as one continuous structure.

• Inward Extrude (Recess / Notch): push a wall inward to carve an L- or U-shaped recess into the room — a real concave footprint with its own back wall, side walls, floor cut and ceiling cut. Recesses carry their own openings and trim.

• Floor / Ceiling Extrude: extrude vertically to stack or sink connected volumes.

🧩 Footprint & 3D Corner Deformation (Experimental)

Hold Ctrl and drag a highlighted corner or wall to deform connected room footprints — shared corners move together so the rooms stay stitched.

3D Corner Deformation Mode adds out-of-plane shaping:

• Drag a wall edge → slides it up or down (keeps its length) → slanted walls.

• Drag a corner → moves it horizontally.

• Shift + drag a corner → raises/lowers the floor at that single corner → arbitrary bilinear slopes (ramps, hips, valleys).

A blue snap grid previews the increments. Windows, doors and the external shell follow the deformation so a slanted wall keeps a correctly-leaning opening and a solid underside.

🧰 Trim: Baseboards & Ceiling Moldings

Assign a skirting or crown-molding model to a wall (optionally over a marked span) and the tool tiles it along the rendered wall segments — automatically breaking at floor-reaching doors/passages and following the wall into recesses (back wall + side walls).

🎨 Painter Mode Deep Dive

Tools

• 🖌 Brush — free-paint a layer's influence. Size, Opacity, Hardness and Rotation are live; an Alpha Preset Gallery supplies brush shapes (splatter, grunge, strokes…).

• 🪣 Bucket — flood-fill an entire surface (or a single wall) with one layer.

• ▦ Grid — paint in aligned tiles for repeating, snapped patterns.

Brush Controls

Control

Meaning

Brush Size (m)

Footprint radius in world metres (Ctrl+Scroll to resize live).

Brush Opacity

Strength of each dab (0–1).

Brush Hardness

Edge falloff — 1 = crisp, low = soft.

Brush Rotation

Rotates the alpha stamp.

Brush Alpha

The shape stamp picked from the preset gallery.

Layers

Add up to 8 layers per surface. Each layer exposes:

• Albedo + Tint + Tiling

• Normal Map (+ scale)

• Mask — Metallic in R, Smoothness in A

• Smoothness / Metallic sliders

• Use Parallax / Tessellation (with displacement depth)

You can Import Layers from Material to seed a surface from an existing material, and reorder/remove layers freely.

Painter Presets

Save a complete set of floor/wall/ceiling/external layers as a named Painter Preset, then apply it to any room. Each room can select its own preset, so a bathroom and a living room can look completely different from the same modeler.

🌫 Dirt Mask Overlay

A per-surface grime pass layered on top of the painted layers: drive a dirt tint, tiling, strength, variation (with its own noise scale) and a smoothness reduction, and choose Color, Color + Smoothness or other blend modes. Great for instant wear in corners and along edges.

⚙️ Technical Features

🏠 External Shell

Enable Build External Shell to wrap the interior in clean exterior walls and a roof, generated from the building's bounds. The shell uses a uniform perimeter UV atlas so the External Wall surface paints continuously around the whole building, and now closes its underside so deformed/raised floors never reveal a see-through gap.

🪞 Pseudo-Bevel (shading only)

A geometry-free edge softener: near wall/floor/ceiling joins, opening reveals and outer corners, the shader tilts the lighting normal to read as a rounded fillet — with an optional baked contact-shadow (AO) in concave bands. Tune Width, Strength, Roundness and Edge Shade. Zero extra triangles.

⛰ Parallax / POM Displacement

Per-layer Parallax Occlusion Mapping adds real depth to bricks, tiles and panelling using a height map, with distance fade (start/end), a step count and a max-layer budget to keep it cheap.

🪟 Smart Fixtures

Windows, door frames, baseboards and crown moldings are derived data: assign a prefab to an opening or wall and the tool bounds-fits the model to the live geometry — matching width/height, keeping native thickness, resting on the sill/floor — and regenerates it after every edit. Door leaves are extracted so they still swing. Fixtures also tilt with deformed walls.

🧊 Colliders & Baking

• Generate Colliders builds collision for the interior as you model.

• Bake Static Prefab freezes the current interior into an optimized, standalone prefab/mesh for shipping — paint textures and all.

📈 Parameter Reference

Geometry

Parameter

Description

Typical

Wall Height

Default room height.

2.5 – 3.0 m

Wall Thickness

Thickness of every wall.

0.1 – 0.25 m

Floor / Ceiling Thickness

Slab thickness.

0.1 – 0.12 m

UV Scale

Global texture scale.

1.0

Generate Ceilings

Cap rooms with a ceiling.

On

Generate Colliders

Build collision meshes.

On

Build External Shell

Add exterior walls + roof.

On for full buildings

Pseudo-Bevel

Parameter

Description

Typical

Width (m)

Bevel band width; 0 = off.

0.01 – 0.03

Strength

How far the normal tilts (up to 45°).

0.5

Roundness

Crisp fillet (0) → soft (1).

0.5

Edge Shade (AO)

Contact shadow in concave bevels.

0.0 – 0.5

Painting

Parameter

Description

Typical

Brush Size (m)

Brush radius in metres.

0.3 – 1.0

Brush Opacity

Per-dab strength.

1.0

Brush Hardness

Edge falloff.

0.5

Paint Resolution

Per-room split-map size (px).

1024 – 2048

Paint Chunk Size

World size of a shared paint tile.

12 m

Fixtures

Parameter

Description

Typical

Door Frame W/H/Depth Margin

Grow the frame past the hole.

0.04 – 0.05 m

Baseboard Height

Skirting height (0 = model native).

0 or 0.08 m

Ceiling Molding Height

Crown height (0 = model native).

0 or 0.08 m

Editor

Parameter

Description

Typical

Snap To Grid

Snap edits to a grid.

On

Grid Size

Snap increment.

0.25 – 0.5 m

Scene Handle Size

On-screen handle scale.

0.12

❓ Troubleshooting

My paint shifted after I resized a wall.

Wall layers share a single perimeter UV atlas, so changing a wall's length re-tiles it. Paint is re-projected from stroke history (it isn't lost), but tiling can move. For a predictable result, finish blocking out the shape before detailed painting, or use Flatten to 1 layer when prompted on the Modeler↔Painter switch.

A window stays bolt-upright on a slanted (deformed) wall.

Fixtures derive their orientation from the live wall basis, so they should lean with the wall after a Rebuild. If an older instance looks wrong, nudge a parameter to force a fixture refresh, or re-assign the opening's model.

The pseudo-bevel disappeared / looks like a dark line.

Confirm Pseudo-Bevel Width > 0 in the settings. The bevel is shading-only — if a recompile/Rebuild hasn't run, trigger one so the mesh regenerates its bevel data.

Fixtures didn't update after an edit.

Fixtures regenerate from a cheap signature of fixture-bearing rooms. If the hierarchy was edited by hand, use the modeler's refresh (or change any fixture margin) to force a rebuild.

📦 Best Practices

• Block, then paint. Get the footprint, openings and deformation roughly right before fine painting to avoid re-tiling.

• One preset per room type. Author bathroom / kitchen / hallway Painter Presets once and assign them per room.

• Keep root scale at (1,1,1). As with any procedural tool, a non-uniform root scale skews fitting and colliders.

• Bake before shipping. Run Bake Static Prefab on finished interiors for the cheapest runtime cost.

• Use the External Shell for full buildings. It gives you paintable exteriors, a roof and a closed underside in one toggle.

Contact / Support: ripvertices96@gmail.com