SketchUp: How to Mirror Objects.

There are several ways to mirror objects in SketchUp
Català - Castellano
Mirror is not a standard tool in SketchUp, but that is probably because there are several ways to Mirror objects using other methods. There are to me 3 methods to mirror objects. Two of them can be done with the standard SketchUp installation, the third one (and probably the best) requires a Plugin. Let's see the 3 of them:
  • We can select the object we want to mirror, right click on it and select "Flip Along:" This will give us the chance to select which plane (red, green or blue) of the object to use as a mirror plane. The negative part of this is that yo can't select the mirror plane. The mirror plane has to be one of the planes defined by the center of the object.
  • We can use the Scale Tool. Select one of the grips (using the grips on the center of the faces of the object's bounding box is the best way to go) and type "-1" as the scale value on the Value Control Box (VCB). Again, we can´t control the mirro plane, it has to be one plane defined by the faces of the bounding box of the object.
  • The third method is to use the Mirror.rb Plugin. This plugin is very easy to use and allows us to select the mirror plane and also to choose if we want to keep the original object or delete it after the mirror operation. It is by far the best way to go. To use the plugin (after saving it to your plugins folder) select the object you want to mirror and go to Plugins --> Mirror Selection. Then you will need to pick the 3 points that define the mirror plane, and at the end you will have te option to choose to either keep or erase the source object. Easy and simple, and a time saver.
You can download the plugin directly here, or go to the original thread by the author TIG. Thanks to him for this great plugin.


  1. Hi there. You can use the scale tool better by clicking on a center point on one of the edges and then drag it in the direction or axes you want it to mirror. Don't worry about distortion. When one of the values goes into the negative (as far as know always the second one) just type in 1,-1 (The minus side might look like -.85, just change it to -1). The 1 is to give the other axis the right dimension, the -1 is for the mirror effect. This is very easy and very controllable. You do not get a copy though, but usually I just use a copy to make a mirror.

    You have added option of changing the dimensions or proportions by typing for instance 1.1,-1.1 - making it 10% bigger.

    I'll download this plugin anyway.


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