Select NURBS object. > Modify panel > Create Points rollout > Dependent Points group box > Surface Point button
Select NURBS object. > Modify panel > NURBS toolbox > Create Surf Point button
This command creates a dependent point that lies on a surface or relative to it. This is enabled with a NURBS object that contains a surface.
To create a dependent surface point:
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Turn on Surf Point and then click over a NURBS surface to position the point.
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The surface cross-section and cursor are highlighted during this operation.
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At the Point sub-object level, adjust the point’s position relative to the surface by adjusting the surface point parameters in the Surface Point rollout.
While a surface point sub-object is selected, the Surface Point rollout appears. These controls are similar to the curve point controls.
U Position and V Position—If the point is on the surface, these coordinates specify the point's location, based on the surface's local UV coordinates.
On Surface—Specifies that the point lies on the surface, at the location specified by U Position and V Position.
If the point lies on the surface, you can move it using the Move transform. You can also move it using the Move Surface Point button. See Editing Point Sub-Objects. Either way, this updates the U Position and V Position values.
Offset—Moves the point according to a relative (object space) X,Y,Z location.
X Offset, Y Offset, and Z Offset—Specify the object space location of the offset surface point.
Normal—Moves the point along the direction of the surface's normal.
Distance—Specifies the distance from the surface, along the normal. Negative values move the point opposite to the normal.
Tangent—Moves the point along the tangent of the UV position.
U Tangent and V Tangent—Specify the distance from the surface along the tangents at U and V.
Replace Base Surface—(Only at modification time.) Lets you replace the parent surface. Click the button, then click the new surface on which to base the surface point.