Function evaluate_curve_d1

src/ifcgeom/taxonomy.cpp:812–815

@todo eliminate redundancy with cgal kernel

	// @todo eliminate redundancy with cgal kernel
	void evaluate_curve_d1(const circle::ptr& c, double u, direction3& p) {
		Eigen::Vector4d xy{ -std::sin(u), cos(u), 0, 0. };
		p.components() = (c->matrix->ccomponents() * xy).head<3>();
	}

	double project_onto_curve(const circle::ptr& c, const point3& p) {
		Eigen::Vector2d xy = (c->matrix->ccomponents().inverse() * p.ccomponents().homogeneous()).head<2>();