The Gearbox model tag contains the render models (LODs) and shader_model references for objects such as vehicles, scenery, and weapons among others. It is not collideable nor animated on its own, and objects may reference additional model_collision_geometry and model_animations tags.

Don't confuse this tag with the Xbox-only model, which Gearbox modified for the PC port. It is therefore used in all derivatives of that port, like Mac, Demo, and MCC. Unlike the Xbox version, the Gearbox model uses uncompressed vertices.

Shaders

Each "part" of a model can reference a different shader, like the Warthog's windscreen using a shader_transparent_glass while its body uses a shader_model. While a model can technically reference any kind of shader, referencing a shader_environment (used for BSPs) is not recommended because it renders incorrectly in Custom Edition.

Markers

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Regions

Regions render in the order they are stored in the tag. When naming regions, consider that they will be sorted by name when compiled into the .gbxmodel. This can be important for skyboxes and objects with multiple layers of alpha-blended transparent shaders which aren't z-culled and need a correct sorting order to be explicitly defined, assuming the object is viewed mostly from one direction.

Permutations

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Structure and fields

This information was partially generated using Invader tag definitions.

Acknowledgements

Thanks to the following individuals for their research or contributions to this topic:

• Fubih (Regions render order tip)
• Kavawuvi (Invader tag definitions)
• MosesOfEgypt (Tag structure research)