The way SketchUp infers to other geometry is one of the key features that makes working in this 3D modeling software so fast and easy. It is a key concept that every SketchUp user should understand, and takes some practice to become proficient in, but you'll be so much better for doing so. Take a look at this tutorial and learn how to properly inference in Google SketchUp.
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Creator's Site: www.sketchup.google.com/training/...
Curated By: rmansur