terrainr advertises itself as a package for landscape visualization in R and Unity. This vignette focuses on the Unity half of the equation – specifically, on how to mostly-automatically import tiles into Unity. If you’re interested in the R half of the package, refer to (the overview vignette)[overview.html]. Note that this vignette will assume you already have Unity installed on your computer.
In order to import terrain tiles into Unity, we will first need to
have some data worth importing! For the purposes of this vignette, we’ll
be using data from the USGS National Map downloaded using
get_tiles, but note that you can use any raster
data for this process.
First things first, I’m going to use the
tmaptools to get the latitude and longitude
of Zion National Park, out in Utah. We’ll use this area for our
<- tmaptools::geocode_OSM("Zion National Park")$coordszion
zion object now contains the x and y coordinates for
a spot near the middle of Zion National Park. Let’s go ahead and turn
that into an
sf object, then use
set_bbox_side_length to add a buffer around the point
coordinates – we’ll download data for the entire 8 kilometer square
around the central point:
library(terrainr) library(sf) library(magrittr) <- data.frame(x = zion[["x"]], y = zion[["y"]]) %>% zion st_as_sf(coords = c("x", "y"), crs = 4326) %>% set_bbox_side_length(8000)
And now we can go ahead and download data for our area of interest, then merge the downloaded tiles into individual rasters. For more on this process or what these functions do, check out (the overview vignette)[overview.html].
Fair warning – downloading this amount of data can take a bit of
time! You can optionally add a progress bar to the
get_tiles download by calling
library(progressr) and then
handlers(global = TRUE) before running this code.
<- zion %>% merged_tiles get_tiles(services = c("elevation", "ortho")) %>% lapply(merge_rasters)
We’ve now got our data downloaded! All that’s left is to import these tiles into Unity.
As of terrainr 0.7.0, the way to do this is via the function
make_unity. Assuming you have Unity installed on your
computer, we can go ahead and import our terrain into a brand new
zion, through the following:
make_unity( project = "zion", heightmap = merged_tiles$elevation, overlay = merged_tiles$ortho )
This will create a new folder, named
our Unity project. Open that project in Unity, and then open the scene
File -> Open Scene)
Scenes/terrainr_scene.unity. Double click on one of
the terrain tiles and you’ll zoom out to see the entire terrain:
You can now move around your surface by right clicking on the image and moving around with the W-A-S-D keys on your keyboard. Note that your movement speed starts off very slow, and then accelerates over time (especially if you press and hold the “shift” key).
And ta-da, you have a surface in Unity! You can go ahead and customize the scene further (I’ll usually then click on “Directional Light” and change “Render Mode” to “Not Important” and “Shadow Type” to “No Shadows”), fly around and across the scene, or do whatever else you want!