Functional Form of Interpolation

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The number of interpolation points you select determines the functional form of interpolation, as shown below:

Number of Points	Functional Form of Interpolation
1D Entities:
2 points	linear variation in 1D parameter space
3 points	quadratic variation in 1D parameter space
4 points	cubic variation in 1D parameter space
2D Entities:
2 points	linear variation in 2D parameter space, with no variation perpendicular to the line that connects the two points in parameter space
3 points	linear variation in 2D parameter space
4 non-colinear points	bilinear variation in 2D parameter space
4 collinear points	cubic variation in 2D parameter space, with no variation perpendicular to the line that connects the four points in parameter space
4 points, with 3 collinear	quadratic variation in 2D parameter space and linear variation perpendicular to the line that passes through the three collinear points

Creo Simulate uses representative space to calculate interpolation and may not apply the interpolated load, heat load, or prescribed temperature in exactly the way you expect. Click the Preview button on the Interpolation Over Entity dialog box to see a display of vector arrows that show the relative magnitude of the load, heat load, or prescribed temperature at different points on the entity.