📚 Essentials

1. Purpose and Overview

   This guide is crafted to help users understand the technical and operational requirements for creating and uploading assets to Atopia’s Online Builder platform. We’ll cover key sections, including Modeling, Export Settings, Texture, Limitations, and Performance.

2. Supported Formats and Platform Specifications

   • Model Files: GLB recommended for stability.
   • Texture Embedding: Ensure textures are embedded for seamless imports.
   • Supported Polycounts: Guidelines per asset category (small, medium, architecture, avatars).
   • Web and Mobile Compatibility: Ensure assets meet requirements to avoid “out of memory” errors on mobile platforms.

📦 Modeling Guidelines

1. Proportions and Scale

   Set proper scale and units in your 3D software. Use a human model as a reference for asset sizing where possible.

2. Polycount Targets

   • Small Assets: 100-1,000 polys
   • Medium Assets: 1,000-5,000 polys
   • Large/Architectural: 5,000-50,000 polys
   • Avatars: Up to 15,000 polys

3. Topology Best Practices

   Ensure clean topology to prevent interpenetration and overlapping meshes, which can degrade rendering performance.

4. Pivot Points

   Set pivot points to align with object orientation. Typically, center pivots for grounded assets or top pivots for hanging items.

⬆ Export Settings

1. File Format: GLB is preferred for stability with embedded textures.
2. Textures
   • Avoid large textures where unnecessary; size depends on asset complexity.
   • Target 2048 x 2048 pixels for WebGL and VR in most cases (the lower the better)
     • In cases of very large models but in a sparse environment you can use up to 4k.
3. File Size: In case of glbs or fbx, since they embed texture ensure the overall size is not higher than 8MB, to ensure fast download and loading of the experience.
4. Additional Tips
   • Avoid exporting scene elements that may cause instability, such as embedded lights or cameras.
   • Check export settings in modeling software for features like UV mapping and embedding textures.

🌠 Texturing Guidelines

1. Texture Optimization

   Use texture atlases to combine textures to reduce load. This can reduce file size and enhance performance.

2. RGB Channels for Multiple Textures

   Integrate textures like Ambient Occlusion, Roughness, and Metalness within the RGB channels to conserve memory.

   • Albedo: Up to 4k. (compressed, the file target should aim for up to 8MB).
     • So, in case of uploading 2d Paintings, a good rule of thumb:
       • For Large paintings: Upload 4k
       • For medium size paintings: 2k
       • For small paintings, 1k
   • AO, Roughness, and Metalness map should not be above 512x512px. In most cases, this will be absolutely enough, preferably even lower 256x256px
   • For Normal Maps: for absolute large paintings, it should be up to 2k maximum, preferably 1k or lower, where less detail is acceptable.