如何使用 Autodesk forge 的 AR 工具包在 Unity3d 上加载大型模型（50mb 以上）

Question

Currently, I'm trying to load an IFC file using an AR toolkit from Autodesk forge. Small files like 10-20MB are loading without any issues, But large files like Above 50 MB are not loading. In the console, it is showing that it's loaded but in the scene, it's not loaded.

Answer 1

For larger scenes, I recommend switching to a glTF pipeline, as a way of getting BIM models from Forge into Unity.

1. First, use https://github.com/petrbroz/forge-convert-utils command line tool, to pull your SVF file, and convert it a glTF file.

2. Then, use glTFast to load that glTF file into Unity. https://github.com/atteneder/glTFast

3. For extreme performance, use 'gltfpack' to compress and optimize your glTF's (2 draw calls, 6:1 compression ratio )... using gltf's new ext_MeshOpt extension. https://github.com/zeux/meshoptimizer/blob/master/gltf/README.md

I've seen pretty amazing results. (in the order of 40Million triangle scene's, with a simple progressive rendering technique)

ext_MeshOpt reference: https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/EXT_meshopt_compression/README.md