The splines can have mathematical curves that give them a realistic sense. Splines can have curvature to them without squeezing many control points to create the illusion of a curve. Due to this incapability, creating, for example, tree branches may be difficult without making and merging many separate branch objects. For example, two splines cannot extend from one control point the splines must connect from one point directly to only one other.
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The Scratch vector editor does not allow objects to have branching splines. There is an option to ], too, which will remove the splines. This allows for smoother drawing and easier editing, but disallows bitmap editing capabilities. The ] is highly dependent on the ], which allows one to create and modify splines. Each spline is proportional to one another by some value. Splines are mathematical curves through a set of control points. Some bitmap paint editors create figures that appear similar to or as smooth as vector graphics however, when zoomed in they will not stay smooth looking but will instead be pixelated.
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1.3 Why Vector Graphics Appear Smoother.