Spline Builder Plugin

Spline Builder Plugin is a practical path-based construction tool for placing and shaping modular 3D content along editable splines. It helps environment artists assemble fences, walls, cables, rails, and other repeated structures while keeping the original source assets intact.

Build Along Editable Paths

Create and edit spline points directly in Scene View, then rebuild the generated structure as the path changes. Add points, insert points after a selection, and use the point menu to refine the route. Generated content is organized under one owned output group, while Clear removes only the objects created by the spline.

A single spline can drive several enabled Object Rows. Each row keeps its own prefab, order, position offset, rotation offset, scale, spacing, and placement settings, making it possible to combine elements such as posts and rails along the same route.

Repeated Prefab Placement

Repeated Prefabs mode places modules along the full spline. With Multiple Object Rows enabled, every row can use independent module length, gap, interval centering, endpoint inclusion, and spline alignment.

When Multiple Object Rows is disabled, the shared object list can provide sequential, random, ping-pong, or weighted selection. This supports varied arrangements without replacing the original prefab sources.

Stretch and Deformation Controls

Stretch Mesh mode can bend suitable geometry along the spline or keep rigid pieces straight. Each row provides segment length, mesh deformation, and forward-axis controls. Preserve Mesh Size keeps the source object's measured longitudinal size by default, while placement interval and gap remain available for spacing.

Nested MeshFilters, imported transforms, palette UVs, and authored normals are retained. Curved deformation requires enough longitudinal vertices in the source mesh; the plugin does not add subdivisions automatically.

Included Content

• Practical Spline runtime and editor tools.
• Repeated Prefabs and Stretch Mesh placement modes.
• Shared multi-row object configuration.
• Per-row transform, spacing, alignment, and endpoint controls.
• Sequential, random, ping-pong, and weighted object selection.
• Scene View point editing with Rebuild, Clear, and Undo/Redo support.
• Fence presentation scene with stone posts and double wooden rails.
• Example prefabs, FBX models, materials, terrain, and presentation assets.

Technical Information

• Package version: 1.0.0.
• Unity package targets Unity 2021.3.
• Project deliveries are provided for Unity and Unreal Engine.
• Generated deformed meshes are retained when saving the scene.
• Closed paths can wrap deformation across the seam.
• Incomplete final bent modules are skipped instead of being shortened.
• Mesh Read/Write can be enabled from the inspector when deformation requires it.
• Source meshes need sufficient geometry along their forward axis to follow curves cleanly.