Find the vertices closest one or more targets, potentially returning the values for the vertices from a data map.
vertexLookup(vertices, target, data_map = NULL, returns = c("index", "coordinates"), coerce = as.numeric)
| vertices | A descendent of mesh3d, |
|---|---|
| target | either a 3-element numeric vector representing x-y-z coordinates for a single target, or a matrix-like object as described above containing multiple targets. |
| data_map | Either NULL, a vector of data about each vertex, or a file containing such a vector spread over multiple lines |
| returns | Whether to return the index of each match (one per target), or the coordinates of the matches, the later being useful when exact matches aren't expected. |
| coerce | A function to coerce the final results to a given type. Defaults to as.numeric, if set to NULL, no coersion is performed. |
If a data_map is specified: a vector, typically numeric, if coerce is set to NULL and data_map is a file, the results will be character. If coerce is null and data_map is a vector it will return the same type as data_map. If data_map is unspecified, it acts like closestVertex