Interpolation and Extrapolation Options for Creating a Field from a Point Map

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When you create a Field from Point Map, there is an option for Interpolation and Extrapolation. Watch the video (5:27) below to learn more about the different options and how they affect the data. 

Interpolation

Linear Interpolation: The linear middle ground based on how far away it is from the point and the other closest point. 

Nearest Point: Looks for the closest point that is referenced in the point map and sets that value equal to there. Creates a Voronoi pattern, because it creates regions where there are closest volumes to a point. 

Natural: A smoothened version of linear interpolation. Allows you to see quadratic patterns in the interpolation. 

Barycentric: Should be used for points in a tetrahedral mesh, like FEA results. Linearly interpolates between the three closest points.

 

Extrapolation

Linear: Looks at the trend inside the interpolation region and extends it outward.

Nearest: Equal to whatever the closest value is at the edge.

Exponential: Looks at the next two points going in and develops a trend that extends out

None: Sets values equal to zero outside. This is the most common option. 

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