选择

Curve selection in Edit Mode has fewer options than with meshes.Mainly this is, because there is only one selectable element type, the control points(no select mode needed here…). These points are a bit more complex than simple vertices,however, especially for Bézier curves, as there is the central vertex, and its two handles…

The basic tools are the same as with ,so you can select a simple control point with the LMB,add to current selection with Shift-LMB, Box Select B, and so on.

One word about the Bézier control points: when you select the main central vertex,the two handles are automatically selected too, so you can move it as a whole,without creating an angle in the curve. However, when you select a handle,only this vertex is selected, allowing you to modify this control vector…

请注意，与网格边不同，无法直接选择一段曲线，而是通过选择组成该段曲线的所有控制点实现。

With curves, all "advanced" selection options are groupedin the Select menu of the 3D Viewport header.

• All A
• Select all.
• None Alt-A
• Select none.
• Inverse Ctrl-I
• Selects all the geometry that are not selected, and deselect currently selected components.

• Box SelectB
• Interactive box selection.
• C
• Interactive circle selection.

• Select Random
• Select random control points.
• Select every Nth control point.
• Ctrl-L
• Select control points that are connected to the current selection.
• Select SimilarShift-G
• Select control points that have similar properties to the current selection.

• Toggle the selection of the first or last control point(s).
• Select Next/Previous
• Selects the next or previous control points.

• Select objects based on their parent child relationships.

Select Random

参考

Select Random control points.

• Percent
• Selects the defined percentage of control points.
• Random Seed
• Seed used by the pseudo-random number generator.
• Action
• Controls whether the operator Selects or Deselects control points.

Checker Deselect

This tool applies an alternating selected/deselected checker pattern.This only works if you already have more than one control point selected.

It works by changing the current selection so that only every Nthcontrol points will remain selected, starting from the active one.

• Nth Selection
• Skip every Nth element leaving it selected.
• Skip
• Number of consecutive elements to skip (keep selected) at once.
• Offset from the starting point.

参考

L (或者 Ctrl-L 全选) 会扩选光标附近的控制点和相连的全部控制点，也就是，选中同属一条曲线的所有控制点。注意，对于贝塞尔曲线，选中一个控制柄后使用 L 会中整个控制点以及与之相连的所有控制点。

选择相似元素

参考

Selects control points that have certain similar properties to the active one.The panel provides several selection options:

• 类型
• • 类型
  • 选择有着相同样条类型的样条,即贝塞尔,NURBS或多项式.
  • 半径
  • 选择有相似半径值的控制点.
  • 权重
  • 选择所有有着相似权重值的点.
  • 方向
  • 选择有相似控制柄方向的控制点.
• 比较
• 等于,大于,小于. (仅适用于半径、权重) (ToDo 2.76)
• 阈值
• 精度 (ToDo 2.76)

(De)select First/Last

参考

参考

该操作基于当前选中项，扩选下一个或上一个控制点(即沿曲线的前一个或后一个控制点)。对于闭合曲线，起点和终点不算作相邻顶点。

扩展选择/缩减选择

参考

作用为基于当前所选的控制点，缩小或扩展选中项。

• 扩展选择
• 选择每一个选中控制点的 全部 相连控制点(即一个或者两个…).。
• 缩减选择
• 对每一个选中控制点进行判定，如果其 全部 相连点均已选中，保持其选中状态。否则，对其取消选择。

这意味着两点:

• 首先，当选中曲线上 所有 控制点都时，什么都不会发生(比如，对于 缩减选择，所有相连的顶点仍将维持选中状态， 扩展选择 则加无所加)。反过来，当未选中任何控制点时，情况也是一样的。
• 其次，这两个工具的作用范围不会 “跳出” 曲线( 决不会从物体的一条曲线 跳到 另一条曲线上)。

Pick Shortest Path

参考

选择激活的和在光标下的这两个控制点之间的曲线片段. 对于闭合曲线情况,会选择最短路径.