The hard interpolation tool is a very useful tool if you want to create edgy looking splines. It repositions the tangents of the spline (only Beziere splines) in such a way that they have the a length of zero. See the images for a better understanding.

Modes
The hard interpolation tool is available in all modes. Note that it makes most sense to use it in point mode since you can only see the control points and tangents in point mode. This spline tool only works on raw spline objects.

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  To use the hard interpolation tool, you first have to select the control points of the spline which should be edgy with the select tool. Once you've made your selection call the menu command "ToolsSplineHard Interpolation". The tangents of all selected control points will now be repositioned to create a edgy looking spline.

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Properties

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