UNIGINE, a real-time 3D engine used primarily in simulation, industrial training, and large scale virtual environments, has released version 2.21 of its SDK — a broad update that touches nearly every part of the engine. For the radiance field community, the headline is a set of meaningful improvements to Gaussian Splatting support, introduced experimentally in version 2.20 last year.
The splatting updates in 2.21 focus on rendering flexibility, visual quality, and giving artists more control over how splats look in a scene. Key additions include that Render Sequence Order now lets users control when splats are rendered in the pipeline, including the option to render them after post processing effects. It means splats can sit more naturally alongside traditional scene elements without being affected by post effects that weren't designed with them in mind.
On the filtering side, UNIGINE has added experimental 2D mip-filtering that blurs splats based on screen size with an adjustable scale, along with adaptive 3D smoothing that scales splats based on camera parameters. The latter is aimed at preserving detail on small objects like grass or wires. A separate Low-Pass Filter Strength control provides basic smoothing for cases where 2D mip filtering is disabled.
The most artist facing addition is a new set of Splat Adjustment Controls. Users can now fine tune color, tint, temperature, saturation, brightness, and black/white points per scene. UNIGINE says these improvements are based on client feedback and recent research. There is still no mention of support for compressed splat formats such as SPZ or SOGs. .ply remains the documented import path.
UNIGINE has also leaned into AI-assisted development, shipping documentation optimized for AI coding agents and an experimental MCPBridge editor plugin that exposes 27 tools for AI agents to interact with the UNIGINE Editor in real time via MCP.
Clustered rendering has been implemented for World, Omni, and Projected light sources, as well as for Environment, Voxel, and Planar Reflection Probes. UNIGINE reports roughly 21% reduction in total GPU and frame time in test scenes with 204 light sources. This is relevant to any scene mixing splats with complex lighting setups.
On the performance side, the release delivers broad optimizations across CPU, GPU, RAM, and VRAM, including up to 62% faster engine initialization on cold starts, 40% faster collision shape loading, and a redesigned thread system that cut typical CPU frame time by 12.5%. Two new SDK editions round out the release. Entertainment (for commercial studios in creative and XR industries, removing the Community edition's revenue cap) and Academic Research (for universities and research labs, with access to many Sim-tier features).
UNIGINE 2.21 can be downloaded from unigine.com.
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