MeshPack

MeshPack analyses all Static Mesh Actors and packs them into instances when the game is packaged.

No need to manually combine actors while you are working on your game.

It works with World Partition and normal levels, making your workflow nondestructive and highly optimized.

MeshPack also re-packs Blueprints, Packed Level Actors and more. This further optimizes your game regardless of your workflow. Works with World Partition, Data Layers, Custom Primitive Data, Level Instances, PLA, Blueprints preserving mesh settings and more. Further details in the docs link below.

MeshPack doesn't currently support meshes with prebuilt static lighting. I want to support this, but unsure if it's technically possible at this point.

Latest update: Version 2.0

• Reworked the plugin from the ground up to more robust and handle edge cases better

• Missing usage flags on materials now gives a warning in the Output log instead of showing up gray in the packaged game

• Fixed an issue with PLAs having ISMs marked as movable

• Sorted the components so that transforms close together ends up in the same ISM

• Physics settings are now copied from the original mesh to the ISM

• Meshes with custom vertex colors are now correctly ignored

Example cases

The Matrix Awakens - City Sample Project

Large open world level with thousands of meshes. The technical demo also puts previously showcased UE5 features Nanite and Lumen through their paces. In a dense, open-world city environment.

MeshPack stats:

• Actors reduced from 111,878 to 37,260

• Components reduced from 1,229,496 to 535,085

Valley of the Ancient

Large open world level with thousands of meshes. Used to showcase UE 5.0 with World Partition and Packed Level Actors.

MeshPack stats:

• Actors reduced from 16,502 to 6,303

• Components reduced from 216,417 to 97,573

Lyra Starter Game

Medium size action game project optimized as a arena shooter. Uses static mesh actors mostly for floors and walls.

MeshPack stats:

• Actors reduced from 4,507 to 1,339

• Components reduced from 6,163 to 3,506

Local benchmark level

Large open world level with over 200,000 StaticMeshActors

MeshPack stats:

• Actors reduced from 214,631 to 1,004

• Components reduced from 215,114 to 2,745

Current version 2.2.1

Technical  Details

Features:

• Analyses Static Mesh Actors in the level and packs those that can be instanced.
• Only runs when the game is packaged, no need to pack actors together while you work.
• Works with World Partition - Actors are packed together within their WP cell as each is processed separately
• Works with Packed Level Actors - All static mesh actors within a PLA are instanced together with the rest of the level.
• Works with Blueprints - Analyses and extracts static meshes from blueprints together with the rest of the level.
• Packs SMs into batches of a sensible size to improve WP level streaming. This setting is adjustable.
• Uses ISMs for Nanite meshes and HISM for rest by default. Forcing ISM or HISM can be set specifically.
• Extensible through C++ and Blueprint. Got a special SM actors you don't want to instance? Add custom logic in no time.

Code Modules:

•  MeshPack - Editor

Number of Blueprints: 0

Number of C++ Classes: 5

Supported Development Platforms: Win64, Mac, Linux

Supported Target Build Platforms: All

Latest Documentation: https://drive.google.com/file/d/1VYouZISleYcijjHK8W8JgCyYw-JtuBnt/view