Measures and reports the maximum and minimum distances between two curves.


  1. Select two curves.

    The command may find one or more intervals of overlap between the two curves, or it may report that the curves do not overlap.

    For each overlap interval, three pairs of indicator marks with indicator lines between them will appear, joining the ends of the overlap interval to the points of greatest deviation within the interval.

    Minimum deviation = Green Marks

    Maximum deviation = Red Marks

    For each overlap interval, the three deviation distances are reported at the command line, along with the world coordinates of the interval ends on each curve.

    Use the command history window or press F2 to view the data in a separate window.

  2. Press Enter to turn off the deviation display.


Analyze > Analyze Curve Deviation


Analyze > Curve > Deviation

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Analyzes and reports the distance between selected points, control points, or mesh vertices and a surface.




Proximity angle

Points qualify for display if the hair line is this close to the normal direction on either the curve or the surface. Default is 1 degree. No points disqualify at 180.

Hair scale

The hair is exaggerated by this factor from the actual distance to the curve or surface. Default is 10.

Display hair

Display the hair line for each qualifying point.

Make hair permanent

Create a line object when the command terminates. Line objects are created on layers with names "Point Test <color>".


Point count

Mean distance

Median distance

Standard deviation


Points beyond this distance are ignored.

Bad point

Points beyond this distance are colored red or ignored.

Good point

Points closer than this distance are colored blue.

On surface

Points on the surface are colored blue.


After changing settings in the dialog box, click Apply to recalculate the display.



Surface Analysis > Point Set Deviation


Analyze > Surface > Point Set Deviation

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