3D Models

Land owners can upload custom 3D models to their plots as long as they meet the Carda Station Compatible Assets specifications.

You can preview your models in the Carda Station Viewer. This shows realistic in-world lighting for , orientation of, and relative location of your scene. It also shows scale of the scene in relation to the avatar. We will continue to enhance this tool to show detailed information such as the vertices, materials, textures and meshes.

Please note that the requirements and specifications listed in this document are subject to changes as we continue to develop and test 3D assets within Carda Station.

Model Requirements

Animations

All animations should be embedded into the glb file.

By default, only the first animation will play. Multiple animations can be combined into one when exporting to the binary glb file format (.glb). In Blender, this is accomplished through assigning the same group name in the Non-Linear Animation editor.

Unity Specific Mesh Naming

Meshes can be named in such a way that a corresponding action will be added to the object when imported into Unity. A mesh name listed below with an "*" on the end means that multiple meshes can be named with the prefix, with an unique suffix added to each mesh.

The following actions can be assigned to a mesh by assigning the corresponding name:

Category	Mesh name	Action	Trigger
Website	web_interaction	Users will be shown the website url and given the option to visit	Avatar presence within 1 meter.
Information	note_interaction	Users will be shown the custom note	Avatar presence within 1 meter.

Camera

Cameras are not allowed as these interfere with the player's camera. Ensure any camera is deleted.

File Type

The 3D Model will need to be a binary GLTF file format (.glb). The glb version is smaller in size compared to the gltf version and will allow for faster downloads and rendering.

Lightning

Lights are currently not supported. You can use materials with emissions instead.

Materials

Supported shaders are PBR Metallic-Roughness, PBR Specular-Glossiness and Unlit.

Orientation

To help align the rotation of your model in the world, use the following to map your positions to the cardinal system of the map. The station is lit by the sun from the SOUTH SOUTHEAST direction. Take this into account when orienting your scene. Y- = NORTH X- = EAST Y+ = SOUTH X+ = WEST

Positioning

The model should be positioned at the centre of the 3D application at (0,0,0). Do not build out from position (0,0,0) but rather ensure the centre of your model is positioned at (0,0,0).

Scale

Ensure models are scaled correctly and fit within the land parcel's boundaries.

Doorways should be big enough to allow players through and should be at least 2.5 meters high.

Textures

Texture size should not exceed 1024 by 1024 pixels. Color depth should be no more than 8-bit if PNG, or Quality Level 6 if JPG. All textures should be embedded onto the glb file.

Preloaded default textures will be added to the player's clients for faster rendering. These will be shared when made available.

Scene Limitations

A plot's size is 20 meters x 20 meters. However, only 16m x 16m can be built on.

Land Size	File Size Limit (mb)	Height (meters)	Meshes	Triangles	Materials	Textures
Small	15	12	30	20K	20	10
Medium	35	30	120	80K	32	16
Large	55	60	250	150K	40	20
Extra Large	75	75	300	180K	46	23