Struct

struct VertexPTN
{
	VertexPTN() {
		position = glm::vec3(0.0f, 0.0f, 0.0f);
		normal = glm::vec3(0.0f, 1.0f, 0.0f);
		texcoord = glm::vec2(0.0f, 0.0f);
	}
	VertexPTN(glm::vec3 p, glm::vec3 n, glm::vec2 uv) {
		position = p;
		normal = n;
		texcoord = uv;
	}
	glm::vec3 position;		// Vertex position.
	glm::vec3 normal;		// Vertex normal.
	glm::vec2 texcoord;		// Vertex texture coordinate (will be used later HWs)
};

std::vector<VertexPTN> vertices;