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Here you can choose how many and where the intermediate points will be used along the given spline:
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None: No intermediate points are used. This always results in a linear interpolation of the spline, where the existing points are connected in a straight line. Any weightings or tangents no longer have any influence.
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Natural: With this interpolation, the intermediate points are concentrated on the area around the spline points. In the case of a B-spline, the intermediate points are then inserted near the spline points. The "Numbers" value regulates the number of intermediate points between the spline points. This automatically reduces the distance between intermediate points in curved areas with many spline points.
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Uniform: this interpolation results in the intermediate points being inserted at equal intervals on the spline curve. The number of intermediate points is determined by the "Number" value. An intermediate point is always located at the position of the first spline point. For open splines, the last spline point is also assigned an intermediate point. The remaining intermediate points, on the other hand, will not be in the positions of the spline points.
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Adaptive: This interpolation type sets intermediate points whenever the angle deviation of the curve is larger than the value given in Angle. The intermediate points of the resulting curve pass through the spline points. If a spline has several segments, then the value of Angle will apply to each segment.
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Subdivided: This mode works similar to "Adaptive". Additional intermediate points will be added until the intermediate segments are shorter than the defined Length value. This means that the distances between the points are not identical to the "Maximum length" value everywhere.
In the "Natural" and "Even" modes, you use this to set the number of intermediate points.
With the “Adaptive” and “Subdivided” modes, this value sets the maximum curvature allowed between two adjacent intermediate points. Smaller values therefore result in a denser placement of intermediate points in curved areas of the spline.
If you use the "Subdivided" mode, additional intermediate points are created until the maximum distance of adjacent intermediate points becomes smaller than this length.