Modeling guidlines to consider:

Polycount:

Less than 100,000 polygons.

Texture optimization:

Please map as many models as possible to a single texture. Additionally, baking the lighting into the textures would be beneficial.

Texture sizes:

Keeping the texture resolutions low with memory, loading and performance. Please optimize them accordingly.

Export settings:

You can choose one of the following options based on your preference.

GLTF format with separate textures and a binary file (.gltf + textures + .bin) GLTF format with embedded textures (.gltf with embedded textures) GLB format with embedded textures (.glb with embedded textures)

Total File Size:

Please try to keep the total file size smaller than 30mb. You can make it larger but it will take longer to load.

UV Editor

Under the UV Editor there are up to 3 textures to assign. There is a flat texture you can use when you want to assign and bake lights. There is a baked lightmap and UV Grid.