Module materials 

PBR material system for deferred rendering.

Provides:

• PBR material definitions (albedo, metallic, roughness, emission, etc.)
• Material instances (per-object parameter overrides)
• Material library with named materials
• Material sorting keys for draw-call batching
• Instanced rendering data (per-instance transform + material ID)
• Material presets (metal, plastic, glass, wood, stone, etc.)

Structs

InstanceBuffer

A buffer of instance data for batch instanced rendering.

InstanceData

Per-instance data packed for GPU instanced rendering. Each instance gets a transform matrix and material parameters.

MaterialInstance

Per-object overrides layered on top of a base PbrMaterial. Only set fields are applied; None means use base material value.

MaterialLibrary

A collection of named PBR materials.

MaterialPresets

Collection of all material presets.

MaterialSortKey

A compact sorting key for materials, used to minimize GPU state changes by batching objects with similar materials together.

PbrMaterial

A physically-based rendering material with full parameter set.

Enums

MaterialPreset

Predefined material types.