models

type Face struct {
	V        [3]int // Indices into Mesh.Vertices
	Material int    // Index into Mesh.Materials (-1 for no material)
}

type GLTFLoader struct {
	// Options
	CalculateNormals bool
	SmoothNormals    bool
}

type Material struct {
	Name       string
	BaseColor  [4]float64  // RGBA in 0-1 range
	Metallic   float64     // 0 = dielectric, 1 = metal
	Roughness  float64     // 0 = smooth, 1 = rough
	BaseMap    image.Image // Optional base color texture
	HasTexture bool
}

type Mesh struct {
	Name      string
	Vertices  []MeshVertex
	Faces     []Face
	Materials []Material
	// Bounding box (calculated on load)
	BoundsMin math3d.Vec3
	BoundsMax math3d.Vec3
}

type MeshVertex struct {
	Position math3d.Vec3
	Normal   math3d.Vec3
	UV       math3d.Vec2
}

type OBJLoader struct {
	// Options
	CalculateNormals bool // If true, calculate normals if not provided
	SmoothNormals    bool // If true, use smooth shading (averaged normals)
}

type STLLoader struct {
	// Options
	SmoothNormals  bool    // If true, average normals per-vertex for smooth shading
	NoDedupe       bool    // If true, don't deduplicate vertices (each triangle gets its own)
	CleanMesh      bool    // If true, clean mesh after loading (remove degenerate/duplicate/internal faces)
	MergeTolerance float64 // Tolerance for vertex merging (default 1e-6, 0 = exact match)
}