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The Google SketchUp inference engine allows you to intuitively draw in a 3D environment.
With just the Line tool, you can easily create a 3D shape.
You can lock a Red, Green, or Blue inference with your arrow keys.
Left is Green.
Right is Red.
And the Up & Down arrow keys are Blue.
Tapping the key again will turn off the inference lock.
You can also hold down the Shift key to lock an inference...
.. including "encouraged" inference lines...
... like this magenta colored parallel inference.