Let's face it, it can be difficult to visualize a 3D sketch from time to time. Especially if splines are involved... The screen is flat and the sketch is not. Period.
For this reason SolidWorks has some great tools that are widely under used. We've created a video using some of these tools and invite you to head on over there to our youtube.com channel to have a look.
The video uses one of those twisty light bulbs as an example modeling task where 3D sketching comes in really handy.
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And if you're already using these tools great! Feel free to throw tomatoes at the screen. :-]