FlipNormal, red and blue, and WorkPlane constraints
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When you use WorkPlanes for constraints remember that they have a normal direction. The normals are the white arrows in the diagram below:
You can change the normal direction by choosing FlipNormal from the workplane's context menu.
If you see a red(dish) workplane you are looking at the front of it.
If you see a blue(ish) workplane when you are looking at the back of it.
Text, images and diagrams © 2021 Owen F. Ransen. All rights reserved. (But copy the source code as much as you want!)