SmartPrefabPlacer

Effortlessly place, align, and preview prefabs on terrain with snap-to-grid logic, rotation, and path placement—perfect for RTS, city builders, and base construction games.

Snap Grid Manager is a powerful and intuitive editor+runtime prefab placement system designed for Unity developers building RTS, simulation, or sandbox-style games.

It includes:

• Snap-to-Grid Placement: Click anywhere on the terrain and place prefabs snapped to a customizable grid.
• Rotation & Preview: Rotate prefabs with one key and preview placements live using a transparent ghost system.
• Path-Based Placement: Use mouse clicks to define a curved or straight path, then automatically place prefabs along that path using Catmull-Rom or linear interpolation.
• Terrain Flattening: Auto-flattens terrain before placing structures to prevent clipping.
• Editor & Play Mode Support: All features work both inside the Editor and during runtime (ideal for custom level editors or God Mode debug tools).
• Randomizer: Apply random rotation, scale, and materials for natural variation.

• Modular design: Easily extendable and cleanly structured.
• Snap-to-grid placement with customizable grid size.
• Ghost placement preview with custom color and transparency.
• Catmull-Rom and linear path placement with adjustable spacing.
• Terrain flattening under placed prefabs (optional).
• Live rotation during placement using customizable snap angle.
• Supports both Editor and Play Mode interaction.
• Randomizer system for rotation, scale, and materials.
• Input support: Mouse click to place, R to rotate, Shift to pan camera.

Includes:

• ✅ Full source code (C#)
• ✅ Demo scene with terrain, camera controls, and UI
• ✅ One code-generated house prefab (CC0-compatible, no license required)
• ✅ Editor custom inspector with foldouts and buttons
• ✅ PDF documentation