Fredo tools is a collection of a series of small plug-ins developed by the author Fredo 6. It contains many practical tools, and there are many kinds of line and surface tools.It includes angle checking, automatic flipping, construction surface reference normal, convex hull decomposition, statistical surface type, curve ramp, bisector, inferential drawing

Edge colored, Dotted lines Colored, Angle Colored, Colored by layerSketchUp has been unable to draw color lines and dashes directly, and the functional weakness has finally been solved. This plug-in from Chris plassais can draw color line segments at will, as well as color and linetype of lines

SketchUp's own undo history can be saved more than 100 times (not tested specifically), but it does not have a history panel like Photoshop. If you want to restore to an earlier state, you can only press Ctrl + Z all the way back. This function can choose undo or redo freely