Use Standard View 
to orient the view of the 3D model so that you can see the centerlines more clearly.
See Navigation techniques.
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Select Set Measurement Start Point
on the Point Cloud toolbar.
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In the point cloud, position the measurement start point on a feature, such as a flange face, a weld, or the center of an elbow. In the example below, the weld line is used to locate the tee.
Left-click to lock the position of the measurement point.
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Drag Start Point Coordinates
from the Point Cloud Measurements window, and drop it on the corresponding location of the pipe sketch in the Detail window
The pipe highlights in the 3D View window, and the new origin that is placed on the pipe sketch is indicated. Smart Isometrics uses the new point data to calculate additional measurement data.
Because the components that appear on sketched pipe in the Detail window are selected from an active piping specification, their dimensions are known. As
such, they appear green in the example below, which is the default color for a fully
specified component.
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Select Set Measurement End Point
on the Point Cloud toolbar.
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In the point cloud, position the measurement endpoint as needed.
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Drag End Point Coordinates
from the Point Cloud Measurements window and drop it in the appropriate location on the pipe sketch in the Detail window.
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Continue placing measurements in the point cloud and transferring them to the pipe sketch until all of the dimensions of the pipeline configuration are fully defined.
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Select File > Save
to save your changes.
By default, coordinate averaging is turned on. To turn off this feature, you must
clear the Enabled check box on the Point Cloud Tab (Options Dialog).