Michael Sumner

speed prospects with {wk}

2

```R SC0_sf % dplyr::transmute(.data$.cx0, .data$.cx1, path_ = .data$ring_id, object = .data$feature_id) object

sc_segment() gives the SC index not SC0

1

`sc_edge()` is ok ```R silicate::sc_segment(silicate::SC0(tr)) # A tibble: 10,853 × 7 object_ edge_ native_ .vx0 .vx1 path_ segment_ 1 erY36j i85ZFS TRUE aXrqMr Wc13d3 1 jrw9Mu 2 erY36j i5gsKD TRUE...

Rust has two candidates, cdt looks pretty current: https://github.com/Formlabs/foxtrot/tree/master/cdt https://github.com/Stoeoef/spade

SC0() is pretty fast, but SC() is very slow - unpack - [ ] building the `object_link_edge` table from SC0 WIP ```R f

Constructors

9

PATH should take x,y DF possibly with groupings/order, so easy to build path lines/polys/points and flip to segment versions. This would be useful for crosstalk testing and straightforward trip structure

generic TODO/explore list

38

This uses very similar idioms: https://github.com/cran/RArcInfo It's designed for .e00 format which is natively "arc-node" topology, i.e. the same as the underlying structures in the maps package, and pretty much...

I.e. ```R library(rgl) source("https://raw.githubusercontent.com/hypertidy/pfft/master/R/extents.R") library(silicate) d

We need to be able to re-triangulate with `DEL`, so in silicate a TRI/TRI0 should be able to - [ ] transform verts and drop back to x-y - [...

Polylist

1

Needs resurrection, would have been helpful back in the day: https://github.com/cran/maptools/search?q=polylist&unscoped_q=polylist https://twitter.com/UrbanDemog/status/1257749410857070592?s=19

See `vctrs::vec_group_id` a drop-in replace for `group_indices()`. Discussed here: https://github.com/r-lib/vctrs/issues/332 The example below is part of ongoing discussion for changes here and in sfheaders/geometries: https://github.com/dcooley/geometries/issues/4 - [ ] flush out...