geom:curve_tangent_normal

The Curve Tangent node outputs the direction that a curve points in at each control point, depending on the direction of the curve (which can be controlled with the 反向). The output values are normalized vectors.

Warning

For NURBS and Bézier spline curves, keep in mind that the value retrieved from this node is the value at every control point, which may not correspond to the visible evaluated points. For example, a Bézier spline might have 48 evaluated points, but only four control points, if its resolution is 12. For NURBS splines the difference may be even more pronounced and the result may not be as expected. A 圆角曲线节点。 can be used to create a poly spline, where there is a control point for every evaluated point.

输入

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属性

这个节点没有属性。

输出

切向（正切）

选择第N个控制点。