While editing a network or a grid you usually want to follow a smooth curve from the coastline or a river bed. In 3D modeling tools you also want to make smooth surfaces, for example a face or a landscape. The 3D modeling software blender uses what they call proportional editing to make editing of smooth curvatures more easy.
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Fall off options
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Proportional editing options
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Configurable influence circle
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Moving a point with the smooth option
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