Show points on the window curves and make sure all segments transition smoothly. Also, any small kinks in the window curves can cause a fillet to fail to close, leaving a small sliver of a gap. Troubleshooting: If a window fails to Inset, it’s probably because one or more window corner radii are too small, and/or the cab radii are too small. It may take a few moments to calculate and show results. To Inset the windows, select the resulting window Faces (I had 5 faces because the rear window had a seam down the middle). You’ll likely be adjusting the window profiles to finalize the design, so preserving the original point structure is important. That would produce a Mutual Trim, resulting in increased point density of the window profile curves. Note: In the prior step, do not select the cab and 3 window curves together, and Trim. The cab should remain a solid after this step, and the windows are now individual Faces. Select Mode: “Keep” with “Keep All Joined” checked. Perform a Trim and then select the 3 window curves as the cutting objects. Select the cab solid (Be sure the cab network curves are deselected). Next, draw 3 closed curves in side view to represent the window outlines. Select all the network curves and Network: Mode: Normal This setting gave me the best result. The effect of the rectangle & circle on the structure is easy to see if you select the completed network and Show Points. The circle helps to keep the network from bunching up when it converges at the center of the roof, resulting in a smoother surface. The rectangle size and position influences the shape of the upper roof line (best to adjust when looking in top view). The rounded red rectangle and circle at the top are not connected to the other curves, but their presence influences the network. The upper cab is a Network made of 7 curves.
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