Projecting Entities onto Surfaces

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The Project (Surface menu) command is used to project one or more points, lines, arcs, curves or continuous entities in the current CPL onto one or more surfaces creating one or more surface curves.

Note that any arcs or curves that are projected consist of vectors, so that the arc/curve should be generated to the desired display tolerance before being projected.

 
To project entities onto one or more surfaces

  1. Select the Project command icon button from the Surface toolbar or the Project (Surface menu) command. The dialog box for the command is displayed.

  2. Enter the tolerance; that is, the maximum distance that the midpoint of a segment of the surface curve may be from the true curve of projection. The default is 0.01.

  3. Click OK to accept the parameters and dismiss the dialog box.

  4. Digitise the surface(s) to project onto.

  5. Perform a finish.

  6. Digitise one or more entities to be projected.

  7. Perform a finish.

Note that unpredictable results will occur if this command is used with a surface which, for some XY co-ordinates, has two or more Z values; for example, a folded surface with an overhang.

For trimmed surfaces, unpredictable results will also occur if the underlying (untrimmed) surface folds over even if the trimmed one does not.

This example shows an arc entity projected onto a surface with two Z values at the same XY co-ordinate.