Fredo Generic Tools on Surface（Fredo Generic Tools on Surface）
动画教程
SketchUp surface drawing tool can draw basic figures on surface easily.
Fredo Line on Surface（Fredo Line on Surface）
动画教程
SketchUp surface drawing tool can draw lines directly on the surface of the surface, and the lines fit intelligently.
Fredo Rectangle（Fredo Rectangle）
动画教程
SketchUp surface drawing tool can draw rectangles directly on the surface.
Fredo Circle（Fredo Circle）
动画教程
SketchUp surface drawing tool, which can draw circles directly on the surface.
Fredo Polygon（Fredo Polygon）
动画教程
SketchUp surface drawing tool can draw polygons directly on the surface.
Fredo Ellipse（Fredo Ellipse）
动画教程
SketchUp surface drawing tool, which can draw ellipses directly on the surface.
Fredo Parallelogram（Fredo Parallelogram）
动画教程
SketchUp surface drawing tool can draw parallelogram directly on the surface.
Fredo Arc（Fredo Arc）
动画教程
SketchUp surface drawing tool, which can draw arcs directly on the surface.
Fredo Circle (3 Points)（Fredo Circle (3 Points)）
动画教程
SketchUp surface drawing tool can draw circles directly on the surface according to three-point positioning.
Fredo Sector (Pie)（Fredo Sector (Pie)）
动画教程
SketchUp surface drawing tool, which can draw the sector directly on the surface.
Fredo Offset on Surface（Fredo Offset on Surface）
动画教程
SketchUp surface drawing tool, which can directly offset the surface.
Fredo Free Hand on Surface（Fredo Free Hand on Surface）
动画教程
SketchUp surface drawing tool can draw freehand lines directly on the surface.
Fredo Edit Contours on Surface（Fredo Edit Contours on Surface）
动画教程
SketchUp surface drawing tool, which can directly edit and modify the profile curve on the surface.
Fredo Eraser on Surface（Fredo Eraser on Surface）
动画教程
SketchUp surface drawing tool, which can directly delete graphic elements on the surface.
说用不了的，可能是因为你安装了SUAPP以外的散插件，而且是重复的Fredo6插件，在“扩展程序管理器”里卸载重复散插件，重启SketchUp就可以了。