...
ext - Extrapolate values outside lookup range.
Fast lookup
...
transitions on active data
lok [xy | xz | yx | yz | zx | zy] fast init [resolution_size]
...
Fast lookup transition on active data using the input value as entry for calculating an index in the resolution curve result buffer for direct lookup result. No extrapolation argument is allowed. The accuracy of the result depends on the size of the result buffer. The values in the result buffer are calculated through interpolation when they were created, but no further interpolation takes place when a value is returned..
Arguments multiple lookup transitions
A set of lookup curves are spread across a horizon. A grid node can be converted using a blend of lookup curves in the node's neighbourhood.
The multiple lookup feature is used normally in depth conversion of grids in case there are many wells in the area. Each well has a separate lookup curve for time to depth. A node in the grid to be depth converted will be influenced by the surrounding lookup curves and get lookup values for all of them using the node as input. The result is calculated by the preferred interpolator using the distance square to the wells as a blending criteria. Although the algorithm was specified and used for depth conversion it is quite general if one has many lookup curves spread laterally across the grid.
See separate documentation.
...