Summary
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 that is 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: This 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 but it doesn't work if the values in the areas outside the domain are needed.
Letâ€™s get started.