using Color = glm::vec3;
using Normal = glm::vec3;
using Index = unsigned int;
using Positions = std::vector<Position>;
using Color = glm::vec3;
using Normal = glm::vec3;
using Index = unsigned int;
using Positions = std::vector<Position>;
using Colors = std::vector<Color>;
using Normals = std::vector<Normal>;
using Indices = std::vector<Index>;
enum Attribute {
ATTRIB_VERTEX,
using Colors = std::vector<Color>;
using Normals = std::vector<Normal>;
using Indices = std::vector<Index>;
enum Attribute {
ATTRIB_VERTEX,