Smart Spline Generator

Placing vine meshes along a wall, stringing ropes between posts, or building a fence that follows a hillside by hand eats up time that could go into lighting, gameplay, or iteration. Smart Spline Generator tackles that job by generating surface-aligned assets directly in Unreal Engine, letting you create ivy, vines, ropes, bridges, fences, and more with a highly customizable workflow. It is made 100% in Blueprints, with a large set of generation parameters and the freedom to use your own meshes.

Aligning generated assets to any surface

The core behavior is simple: a spline reacts to a surface and places geometry along it. Instead of manually rotating and positioning every rock, leaf, or rope segment, the generator aligns the result to whatever it touches. You can then control generation behavior through parameters such as spline direction, sub-spline amount, spline and sub-spline length, curve, mesh amount, align rotation, height above ground, and random irregularity levels.

Every parameter has a tooltip explaining it, and all features are demonstrated in working demo levels directly inside the engine. That means you’re not just tweaking values blindly — the included documentation levels show what each setting does on a concrete example before you apply it to your own scene.

Starting presets and your own meshes

The package comes with a set of starting presets that you can derive from. These give you immediate results for common assets, but they’re only the starting point. Because the generator accepts your own meshes, you can feed it whatever geometry your project already uses. This keeps the generated result consistent with your art style instead of forcing you to adopt a separate set of prefabs.

That flexibility is useful for both realistic and stylized scenes. The same spline logic that grows ivy over a ruin can also string cables along a sci-fi corridor, as long as you supply the right mesh and adjust the parameters.

Automatic bridge mechanic and low-poly edge snapping

One of the standout features from the preview is the automatic bridge mechanic. The generator automatically finds nearby surfaces and creates bridges between them. You can control bridge gravity and other related settings, which is presented in the video preview and gives you more control over rope or plank bridge behavior without manual spline placement.

Edge cases matter too, especially with lower-poly assets. The low-poly edge snapping feature prevents problems caused by low polygon counts near surface edges. So if you’re generating vines on a wall with a low-poly mesh, the asset doesn’t break or float awkwardly where the surface boundary is. The system is also compatible with automatic spline mesh optimization, which replaces most spline mesh sections with low-poly versions and leaves only critical areas like edges or corners fully detailed. This keeps the overall look intact while cutting unnecessary geometry.

StripStem and other performance-minded updates

The latest update introduces StripStem, a feature aimed at stem-heavy assets such as vines with many sub-stems, long cables, and ropes. Instead of using regular cylinders for stem spline meshes, it uses a poly strip, and thanks to the UE SplineThicken material function, the stem still keeps its cylindrical look. The vert count reduction is significant — on one of the advanced vine presets it cuts the vert count by more than half. That saving can make a large difference in dense foliage scenes where stem meshes add up quickly.

The same update also improved generation speed and made asset handling faster and more convenient. RunConstructionScriptOnDrag is now turned off by default, so the tool doesn’t rebuild construction scripts every time you drag an actor into the level. New controls let you adjust stem thickness with start thickness, end thickness, and thickness falloff. There’s also an on/off switch for spline mesh shadow casting and collision, which is useful for optimizing individual assets after generation.

Convert any generated asset to a static mesh

Because the generator is built entirely in Blueprints, it lives fully inside the Unreal Editor workflow. It also works with the UE Merge Actors tool, which converts any generated asset into a single static mesh. That means you can generate a complex vine-and-branch system, merge it, and then reuse it in other levels or projects — or export it and edit it in your external 3D application. This conversion step is a practical way to lock in a procedural result and treat it as normal game art.

For teams working on larger projects, this removes a common barrier: procedural tools often leave behind spline-heavy actors that are hard to bring into other pipelines. Here, merging gives you clean, static meshes without losing the convenience of the initial spline-generated placement.

Production fit and real-world usage

Smart Spline Generator has seen wide use in the Gothic 1 Remake, according to usage examples linked in the video preview. That kind of adoption says a lot about how the tool behaves in a real production environment. The ability to generate surface-aligned assets quickly, control them with documented parameters, and then optimize or convert them means it slots well into level art workflows for environment artists and technical artists alike.

The practical takeaway is straightforward: if your scenes are full of organic, surface-hugging props, this tool trades tedious hand placement for fast, controllable generation. Between the preset starter set, custom mesh support, automatic optimization, and the Merge Actor workflow, it covers both the initial creation pass and the technical cleanup phase in one Blueprint-based package.

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