第三章 几何
工具箱
代码链接：op_course_helpers/visualization/pt_and_vec.rb
可视化 Geom::Point3d
CourseHelpers.visualize_pt(Geom::Point3d.new([1.m, 1.m, 0]))
可视化 Geom::Vector3d
CourseHelpers.visualize_vec(Geom::Vector3d.new([1.m, 1.m, 1.m]))
代码链接：op_course_helpers/visualization/pt_and_vec.rb
CourseHelpers.visualize_pt(Geom::Point3d.new([1.m, 1.m, 0]))
CourseHelpers.visualize_vec(Geom::Vector3d.new([1.m, 1.m, 1.m]))