KOLC+ Updates 3DGS Viewer with LoD Support, Enabling Rapid Web Sharing of 1GB+ Large-Scale Scenes

KoLg Co., Ltd. (Toshima-ku, Tokyo; CEO: Masao Tsutsumi) is pleased to announce the renewal of its 3D Gaussian Splatting (3DGS) web viewer within the BIM/CIM cloud 'KOLC+' to support LoD (Level of Detail). This update allows for rapid initial display and spatial sharing of large-scale 3DGS files exceeding 1GB on web browsers through file splitting technology.

## Background of Development
Since its emergence in 2023, 3D Gaussian Splatting (3DGS) has garnered global attention as a groundbreaking 3D generation technology. Recently, its use for site digital twins and progress management in the construction industry has expanded rapidly. However, construction sites requiring wide-area management often result in extremely large 3DGS file sizes. To share and view these smoothly in general web browsers (cloud environments), support for 'LoD (Level of Detail)' technology—which optimizes the detail of data loaded based on camera distance and perspective—became essential.

In early 2026, LoD support advanced rapidly in OSS 3DGS rendering engines. Our company quickly adopted this cutting-edge technology and completely overhauled the conventional 3DGS viewer architecture. As a result, even scenes of vast construction sites can now be rendered and shared at high speed without stress on browsers.

## What is LoD (Level of Detail)?
LoD is a rendering acceleration technology that automatically controls 3D data to be 'coarse at a distance and fine up close.' It dynamically regulates data density and precision in real-time according to the distance from the user's viewpoint (camera position). By pre-splitting and optimizing 3DGS files based on levels of detail, it becomes possible to load only the minimum required data.

## Key Updates
- Overhauled 3DGS rendering engine with LoD support
- Support for SOG (.sog) and KSPLAT (.ksplat) formats
- Support for walkthroughs (keyboard operation)

## Overview of KOLC+ '3DGS Viewer'
- Managed on Japanese domestic servers (AWS Tokyo / Sakura Cloud)
- LoD support
- Supported formats: PLY (compressed/uncompressed), SPZ, SPLAT, KSPLAT, SOG
- Supported extensions: .ply / .spz / .splat / .ksplat / .sog
- PLY format delivery size compressed to 1/8 through conversion
- Keyboard-operated walkthrough support
- Vertical adjustment and saving capability
- Saving of initial camera viewpoint
- Distance measurement support
- Switchable to point cloud display mode
- Support for operation on smartphones and tablets (iPad)

## About KOLC+
KOLC+ is a 'BIM/CIM cloud' that integrates, shares, and utilizes BIM/CIM models and point clouds on the cloud. It is used as an information sharing system (ASP) by organizations like the Ministry of Land, Infrastructure, Transport and Tourism, with over 500 member companies. It is also certified as eligible software for the Ministry's 'Building GX/DX Promotion Project.'