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Publish Date: Sep 6, 2006

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Using the 3D Curve Graph

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The 3D curve graph is the simplist of the 3D graphs. It allows the programmer to draw a three dimensional curve in space. The curve is specified by three vectors, corresponding to the X, Y, and Z coordinates of each point, respectively. Effectively, the curve is defined parametrically, where the index of the arrays is the parameter.

For example, the following 25 coordinates create the 3D curve shown:
Table 1.
0.00, 0.00, -2.04
0.26, 0.07, -2.02
0.46, 0.26, -1.97
0.55, 0.55, -1.89
0.51, 0.88, -1.77
0.32, 1.20, -1.62
0.00, 1.44, -1.44
-0.42, 1.56, -1.24
-0.88, 1.53, -1.02
-1.33, 1.33, -0.78
-1.71, 0.99, -0.53
-1.95, 0.52, -0.27
-2.04, 0.00, 0.00
-1.95, -0.52, 0.27
-1.71, -0.99, 0.53
-1.33, -1.33, 0.78
-0.88, -1.53, 1.02
-0.42, -1.56, 1.24
0.00, -1.44, 1.44
0.32, -1.20, 1.62
0.51, -0.88, 1.77
0.55, -0.55, 1.89
0.46, -0.26, 1.97
0.26, -0.07, 2.02
0.00, 0.00, 2.04


To use the 3D contour graph, place the control (Graph->3D Curve Graph) on your front panel. This creates the ActiveX control and the associated Plot 3D Curve VI:


Figure 1.

Then, simply wire up three arrays containing the X, Y, and Z coordinates of each point in the curve.


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