mtl

type DecodeLimits struct {

	// MaxMaterialCount specifies the maximum number of
	// material declarations that can be parsed.
	MaxMaterialCount int
}

type Decoder interface {

	// Decode decodes the MTL Wavefront resource, specified
	// through the io.Reader, into a Library model.
	//
	// If decoding fails for some reason, an error is returned.
	Decode(io.Reader) (*Library, error)
}

type Library struct {

	// Materials contains a list of all the materials that
	// were defined in the given library.
	Materials []*Material
}

type Material struct {

	// Name holds the name of this material.
	Name string

	// AmbientColor holds the ambient color to be used
	// when rendering objects.
	AmbientColor RGBColor

	// DiffuseColor holds the diffuse color to be used
	// when rendering objects.
	DiffuseColor RGBColor

	// SpecularColor holds the specular color to be used
	// when rendering objects.
	SpecularColor RGBColor

	// EmissiveColor holds the emissive color to be used
	// when rendering objects.
	EmissiveColor RGBColor

	// TransmissionFilter holds the filter to be used on
	// colors when rendering objects.
	TransmissionFilter RGBColor

	// SpecularExponent defines the specular exponent for
	// this material.
	//
	// The specular exponent defines the sharpness of the
	// specular reflection. The value will generally range
	// between 0.0 (sharp) and 1000.0 (soft).
	SpecularExponent float64

	// Dissolve defines the dissolve for this material.
	//
	// Dissolve indicates how much an object should blend.
	// The value should range between 0.0 (fully transparent)
	// and 1.0 (opaque).
	Dissolve float64

	// Illumination defines the illumination model to be used when
	// rendering objects.
	//
	// The value ranges between 0 and 10.
	//
	// 	0. Color on and Ambient off
	// 	1. Color on and Ambient on
	// 	2. Highlight on
	// 	3. Reflection on and Ray trace on
	// 	4. Transparency: Glass on, Reflection: Ray trace on
	// 	5. Reflection: Fresnel on and Ray trace on
	//	6. Transparency: Refraction on, Reflection: Fresnel off and Ray trace on
	//	7. Transparency: Refraction on, Reflection: Fresnel on and Ray trace on
	//	8. Reflection on and Ray trace off
	//	9. Transparency: Glass on, Reflection: Ray trace off
	//	10. Casts shadows onto invisible surfaces
	Illumination int64

	// AmbientTexture defines the location of the ambient
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// ambient texture provided.
	AmbientTexture string

	// DiffuseTexture defines the location of the diffuse
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// diffuse texture provided.
	DiffuseTexture string

	// SpecularTexture defines the location of the specular
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// specular texture provided.
	SpecularTexture string

	// EmissiveTexture defines the location of the emissive
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// emissive texture provided.
	EmissiveTexture string

	// SpecularExponentTexture defines the location of the specular
	// exponent texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// specular exponent texture provided.
	SpecularExponentTexture string

	// DissolveTexture defines the location of the dissolve
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// dissolve texture provided.
	DissolveTexture string

	// BumpTexture defines the location of the bump
	// texture to be used when rendering objects.
	//
	// If this value is the empty string, then there is no
	// Bump texture provided.
	BumpTexture string
}

type RGBColor struct {

	// Specifies the amount of Red in this color. Usually in the
	// range 0.0 to 1.0.
	R float64

	// Specifies the amount of Green in this color. Usually in the
	// range 0.0 to 1.0.
	G float64

	// Specifies the amount of Blue in this color. Usually in the
	// range 0.0 to 1.0.
	B float64
}