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The Grid of Points (Surface menu) command lets you fit a surface through a set of points arranged in a grid.
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You must specify the number of points in U and V, and digitise them all in exactly the right order (determined by the 'Laced' parameter). |
The surfaces you can create from the points are:
Spline (produces same results as Spline command)
Bezier (produces same results as Bezier command)
B Spline (with Control Points as the Point Type, same as B Spline command)
Fitted B Spline (Point Type = Fitted)
Smoothed B Spline (Point Type = Smoothed)
This diagram shows the different methods of using points to define curves on the surface, as seen from one side.
The parameters for the Grid of Points command are:
Laced – Check this box to specify that you want to digitise the points in an order following a laced pattern. This diagram shows the sequence of digitising a 3x3 grid of points (U Points=3, V Points=3):
U Points/V Points – Specify the number of points in the U and V directions of the grid.
U Degree/V Degree – Specify the degree of the surface in the U and V directions (the number must be less than the corresponding number of points). The section Creating B Spline Surfaces discusses the effect of the Degree parameter.
Surface Type – Specify the type of surface to be created.
Point Type – Defines how the digitised points are to be treated when creating a B Spline surface.
If you selected the Surface Type to be Bezier or Spline, Point Type is set to Control Points.
Smooth Tolerance – The tolerance to which the surface is fitted through the points. This is only used when the Point Type = Smoothed Fit Points.
The Display parameters, and Layer, Colour, Style and Name are the same as for all surface commands. See Viewing Surfaces for details.