Subtract

Creating a New Triangulation through Subtracting Overlapping Triangulations

Use the Subtract option to create a new triangulation from two overlapping triangulated surfaces. The two existing triangulated surfaces must be loaded onscreen prior to selecting the Subtract option.

The new surface will have Z values that are equal to the difference between the two original surfaces and correspond to the overlapping area only. Where necessary, additional points are created and their Z values extrapolated.

This method generates a large number of triangles since the two input triangulations are resolved against each other. The Arithmetic option to pick one triangulation as a template.

Figure 1: Plan View - Subtracting Triangulations

Figure 2: Section View - Subtracting Triangulations

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Instructions

On the Model menu, point to Triangle Surface, and then click Subtract.

Select the necessary triangulations.

Note:   The order you select the triangulation is important because the resulting triangulation will have Z values equal to the relative difference in Z values of the first triangulation and the second triangulation.

The Resultant Triangulation name panel is then displayed. This panel allows you to specify a name for the new triangulation, as well as its display properties.

(For more information about completing the Triangulation panel, see Specifying Triangulation Information Using the Triangulation Panels in the Model section of Vulcan help.)