测量 工具是一种交互式工具，您可以在场景中拖动直线以测量距离或角度。可以激活吸附到几何图形以提高准确性或来测量壁厚。测量 工具可以从工具栏访问。
以下是使用 测量 工具的常用步骤：
从工具栏激活 测量 工具。
Drag either end of the ruler to move it.
Holding Ctrl while moving enables snapping to edges and vertices.
Holding Shift while moving lets you measure the distance between faces. This only works well with parallel faces, e.g. walls.
Click on the midpoint of a created ruler to convert it to a protractor. The midpoint can then be dragged just like the endpoints.
A selected ruler can be deleted with Delete or X. To delete all measurements, delete the "RulerData3D" layer in thepanel (see image above).
All measurements are hidden when another tool is selected. They are shown when the Measure tool is selected again. However, you can do editing operations while the ruler is active. For example, you can edit the rotation or scale of the selected object in the Sidebar.
Measurements do not appear in the Render output.
Unit settings and scale from the scene are used for displaying dimensions. Changing the unit system (metric, imperial), or the units of length (cm, m, ...) or angle (degrees, radians) will update the measurements.
In Edit Mode only, there is also a Measurement group in the Viewport Overlays popover. Using the settings in this group, you can have the viewport automatically display measurements for selected edges and faces, without the need to manually create a ruler.