Unity Add-on
Installation and use
Version
Release 0.5.0 — June 05 2025
About
With this package, users can:
Enter text prompts to generate 3D Gaussian Splats (3DGS) and mesh FBX models
Display 3D Gaussian Splats inside Unity
Apply cutouts, colliders, and shadows to 3D Gaussian Splats
Import and export .ply files
Convert 3DGS to mesh
Installation
Software requirements
Unity 2022.3+
Instructions
Previous release 0.4.0 must be removed before downloading 0.5.0
2. Download the Package
In Unity, create a new 3D project or open an existing one
Go to My Assets
Select 404—GEN from the list
Click "Download"
3. Import the Package
After the package has been downloaded, click "Import"
When the import window appears, keep all files selected and click "Import"
4. Edit Project Settings
Make sure that the correct rendering backend is selected
Direct3D12 on Windows
Metal on Mac
Vulkan on Linux
Universal Render Pipeline (URP) and High Definition Render Pipeline (HDRP)
As Unity's URP and HDRP are more complex than the Built-in Render Pipeline, a Gaussian Splat render pass must be added to the scene in order to generate Gaussian Splats.
This step is not necessary when only generating mesh.
When the custom render pass is not present, the 404—GEN 3D Generator window will display a warning message, along with a button to Load URP/HDRP support pack, then Add custom rendering pass.
Usage
Generating
Go to Window > 404-GEN 3D Generator to open the generation window
Select Gaussian Splat or mesh model.
Type your prompt and click Generate. Each generation should take approximately one to two minutes.
Prompts
For help structuring prompts, visit the Prompts section of this guide:
Transformations
In addition to the Position, Rotation, and Scale values in the Inspector, there are two easily adjustable values.
Splat Scale: Controls the size of the points, represented by ellipsoids, in the Gaussian Splat
Opacity Scale: Points within Gaussian Splats have varying degrees of opacity. This increases or decreases the opacity of all points.
Cutouts
The cutouts feature can be used to hide a selection of points within the Gaussian Splat, defined by either a box or ellipsoid.
Create a cutout for a selected Gaussian Splat by clicking Add Cutout under the Cutouts heading of the Inspector.
Select a shape and move/scale/rotate as needed.
By default, only the points inside the cutout will be rendered. Select invert to render the points outside the cutout.
Mesh Collider
The Add Mesh Collider button in the Inspector will add a convex hull mesh collider.
Shadows
Like the mesh collider, the Add Shadow button in the inspector adds an invisible convex hull mesh to the Gaussian Splat. The shadow it casts lacks any fine details, however the convex hull's low poly count makes it very lightweight.
Convert to Mesh
The Convert to Mesh button will open a Mesh Conversion window with input field (for Gaussian Splat component), file output folder location, conversion settings, reference fields for files that are created in the process (.ply and .mesh files), as well as the reference field for the game object that will be created and placed in current scene (Instance).
The sliders adjust the level of detail on the mesh output.
Once the Start conversion to Mesh button is used the process will start populating the object fields as they are created. The process takes approximately one minute to convert the Gaussian Splat (PLY) to mesh (FBX).
Import/Export .ply
The Gaussian Splat can be exported in .ply format using the Export PLY button.
.ply files can be imported by adding them to the project's Assets folder and the scene.
Gaussian Splats
To learn more about 3DGS (3D Gaussian Splatting), visit the Gaussian Splatting section of this guide:
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