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Just a code dump for now tocylr does direct translation from planar (igh in this case) to cylinder
tocylr
list(cbind(x, y)[c(seq_along(x), 1), ]) } cut <- sf::st_sfc(sf::st_multipolygon(list( to_polygon(rep(c(80.01, 79.99), each = 91), c(-90:0, 0:-90)), # third cut bottom to_polygon(rep(c(-19.99, -20.01), each = 91), c(-90:0, 0:-90)), # second cut bottom) to_polygon(rep(c(-99.99, -100.01), each = 91), c(-90:0, 0:-90)), # first cut bottom) to_polygon(rep(c(-40.01, -39.99), each = 91), c(90:0, 0:90) ) ) ), crs = 4326) data("wrld_simpl", package = "maptools") ## we have to buffer, else topology problems (other sources are not perfect either) world_sf <- sf::st_buffer(sf::st_as_sf(wrld_simpl), 0) library(sf) x <- x <- st_difference(world_sf$geometry,cut) #plot(st_transform(x, "+proj=igh")) gr <- graticule::graticule(seq(-180, 180, by = 10), seq(-90, 90, by = 10), nverts = 120, tiles = TRUE) grc <- st_difference(st_as_sf(gr), cut) #plot(st_transform(grc, "+proj=igh")) ## avoid sf preventing overplot plot(st_geometry(st_transform(grc, "+proj=igh")), col = rgb(0.95, 0.95, 0.95, 0.5), border = "transparent") plot(st_cast(st_transform(grc, "+proj=igh"), "LINESTRING"), add = TRUE, col = rgb(0.65, 0.65, 0.65)) plot(st_transform(world_sf, "+proj=igh"), add = TRUE, col = "transparent", border = "black") ## now mesh and plot in rgl library(anglr) im <- ceramic::cc_location(cbind(0, 0), buffer = 6378137 * pi) mesh0 <- anglr::as.mesh3d(DEL0(st_transform(x, "+proj=igh"), max_area = 1e10), image_texture = im) #mesh_plot(mesh) mesh <- mesh0 tocyl <- function(lonlatheight, rad = 6378137) { theta = lonlatheight[,1] * pi/180 v = lonlatheight[,2] * pi/180 x = rad * cos(theta) y = rad * sin(theta) cbind(x, y, v) } tocylr <- function(lonlatheight, rad = 6378137) { theta = lonlatheight[,1] v = lonlatheight[,2] x = rad * cos(theta) y = rad * sin(theta) cbind(x, y, v * rad/pi) } scl <- function(x) scales::rescale(x, to = c(-pi, pi)) #xyz <- reproj::reproj(t(mesh$vb[1:3, ]), source = "+proj=igh", target = 4326) xyz <- cbind(scl(mesh$vb[1, ]), scl(mesh$vb[2, ]), scl(mesh$vb[3, ])) xyz[!is.finite(xyz)] <- NA mesh$vb[1:3, ] <- t(tocylr(xyz)) gmesh <- SC0(st_cast(st_transform(grc, "+proj=igh"), "LINESTRING")) xyz <- cbind(scl(gmesh$vertex$x_), scl(gmesh$vertex$y_), 0) xyz[!is.finite(xyz)] <- NA gmesh$vertex$z_ <- 0 gmesh$vertex[c("x_", "y_", "z_")] <- tocylr(xyz) glb <- anglr::globe(SC0(world_sf)) plot3d(mesh) plot3d(gmesh, add = TRUE) plot3d(glb, add = TRUE, color = "lightgrey") aspect3d("iso") bg3d("black") play3d(spin3d(c(0, 1, 1)))
https://twitter.com/mdsumner/status/1295246118087880704?s=20
https://twitter.com/mdsumner/status/1295154142969647104?s=20
The text was updated successfully, but these errors were encountered:
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Just a code dump for now
tocylr
does direct translation from planar (igh in this case) to cylinderhttps://twitter.com/mdsumner/status/1295246118087880704?s=20
https://twitter.com/mdsumner/status/1295154142969647104?s=20
The text was updated successfully, but these errors were encountered: