This modifier applies a reduction operation to a certain property of all particles within a spatial bin.
The reduction operation can be the sum, the average (mean), or the minimum or maximum value of the property inside the bin.
The spatial bins are aligned parallel to the simulation cell axes.
The bin grid can be one- or two-dimensional.
The particle property the reduction operation should be applied to.
The type of reduction operation to be carried out. Possibilities are sum, mean, min or max. There is an additional option "sum divided by bin volume", which sums first and then divides the result by the volume of the respective bin. This option is intended to compute pressure (or stress) within each bin from the per-atom virial.
The alignment of the bins. Note that selecting a single cell vector gives a one-dimensional bin grid. Bins are aligned perpendicular to the selected cell vector. Selecting two cell vectors gives a two-dimensional bin grid. Bins are aligned perpendicular to both cell vectors (i.e. parallel to the third vector).
Numerically compute the first derivative of the binned data using a finite differences approximation. This works only for one-dimensional bin grids. (It is useful to e.g. compute the derivative of a velocity profile to get the shear rate.)
Number of bins in both binning directions.
Restricts the calculation to the subset of particles that are currently selected.
If selected, the plotted property range (or color scale for 2D plots) will be set to the values given in the "From:" and "To:" fields. Otherwise, the minimum and maximum data values will be used to automatically adjust the plotting range.
The code for this modifier has been contributed to OVITO by Lars Pastewka.