# Material defined in a `.mtl` file
class MtlDef

	# Name of this material
	var name: String

	# Ambient color
	var ambient = new Vec3 is lazy

	# Diffuse color
	var diffuse = new Vec3 is lazy

	# Specular color
	var specular = new Vec3 is lazy

	# Dissolved level, where 1.0 is fully visible
	var dissolved = 1.0

	# Transparency level, where 1.0 is fully invisible
	fun transparency: Float do return 1.0 - dissolved

	# Illumination model
	var illumination_model = 0

	# Ambient map
	var map_ambient: nullable String = null

	# Diffuse map
	var map_diffuse: nullable String = null

	# Bump map or normals texture
	var map_bump: nullable String = null

	# Specular reflectivity map
	var map_specular: nullable String = null

	# Specular exponent map
	var map_exponent: nullable String = null

	# Collect non-null maps from `map_diffuse, map_bump, map_specular, map_exponent`
	fun maps: Array[String]
	do
		return [for m in [map_ambient, map_diffuse, map_bump, map_specular, map_exponent] do if m != null then m]
	end
end