Simplygon SDK 10.4 – Industry-Leading 3D Model Optimization SDK for Games, VR/AR, and Industrial Simulation

Simplygon is a 3D computer graphics software for automatic 3D optimization, based on proprietary methods for creating Level of Detail (LODs) through polygon mesh reduction and other optimization techniques . The SDK version is designed for deep integration into custom content pipelines via an API, unlike the standalone desktop application.

Simplygon 10.4 is the latest major release (Autumn 2025). This release introduces significant new features including a clustered meshlet optimizer for modern mesh shader pipelines, major improvements to the Unreal Engine plugin (supporting UE 5.5 & 5.6), enhancements to the high-density reducer and quad reducer, an updated small part remover, and expanded support for Blender 4.2 LTS, Maya 2025, and 3ds Max 2025.

Primary Users

Simplygon SDK 10.4 is designed for technical artists, graphics programmers, and game developers in studios of all sizes, as well as engineers in industrial simulation, VR/AR, and digital twin development. It serves professionals who need to:

  • Automate the creation of Level of Detail (LOD) chains for thousands of assets to optimize rendering performance

  • Reduce polygon counts while preserving visual quality through advanced mesh reduction algorithms

  • Generate texture-baked proxy models, impostors, and occlusion meshes to replace complex geometry at distance

  • Integrate optimization pipelines directly into game engines (Unity, Unreal) and DCC tools (3ds Max, Maya, Blender)

  • Prepare 3D assets for real-time rendering on hardware with limited resources

Key Features & Capabilities

Core Optimization Processors

  • Reduction: Reduces the amount of data (polygons/vertices) while preserving all relevant original vertex data, including normals, texture coordinates, and vertex colors

  • Remeshing: Generates a new replacement mesh, often used to replace a group of objects with one so-called proxy object

  • Aggregation: Combines all geometry and materials in a scene into a single object

  • Impostor (Billboard/Flipbook): Maps all geometric details as textures; ideal for models viewed from a distance and a certain direction

  • Occlusion Mesh: Generates silhouette-based geometry that removes internal features and concavities for simplified collision or rendering

New in 10.4

Clustered Meshlet Optimizer

A new tool that creates optimized clusters of meshlets along with the data required to determine which clusters to render. Meshlets are optimized for modern rendering pipelines and hardware that use mesh shader–based render pipelines. This tool provides a continuous LOD system where each part chooses its own detail level, avoiding seams at the edges .

High-Density Reducer Improvements

  • Now supports triangle count and triangle ratio as reduction targets

  • Takes normals into account (toggle with UseNormalRanker)

  • Added Isotropicity setting to control the balance between adaptive reduction and creating evenly spaced triangles

Quad Reducer Enhancements

Improved accuracy of normal ranking, particularly benefiting meshes with shiny surfaces (e.g., automotive assets), resulting in higher quality quads .

Small Part Remover

A tool for removing small non-connected parts of a model (e.g., screws). In 10.4 it can be used as a pre-process step in the reduction pipeline and configured with physical size, on-screen size, or percentage of scene diameter targets .

Attribute Tessellation Improvements

  • Shading Network Support: introduced support for shading networks during displacement injection

  • Vertex Color Casting: can now cast vertex color data to tessellated vertex colors

  • Bone Influence Addition: includes bone influences for improved deformation and animation

Platform and Integration Support

  • Unreal Engine Plugin: Now supports UE 5.5 and 5.6 (support for 5.4 dropped). The Simplygon Subsystem API has been reworked for stability and performance, and now supports exporting and importing Static Meshes .

  • Unity Plugin: Supports Unity 2022 LTS and Unity 6.0 LTS, as well as URP and HDRP rendering pipelines via ComputeCasters .

  • DCC Tools: Compatible with 3ds Max 2025, Maya 2025, and Blender 4.2 LTS .

  • File Formats: FBX importer/exporter now supports blendshapes; USD importer/exporter supports multiple UV sets; glTF now supports up to 8 bone influences per vertex