The goal of textures is to utilize texture mapping in rgl to work with images in different coordinate systems and mapped onto arbitrary shapes.
We aim to illustrate texture mapping capability in rgl with core techniques familiar to R users, and with minimal resort to specialist code. When specialist code is required it will be brought out explicitly and explained in a single-step.
Current functions are:
See design vignette.
Install from github, will require development tools for compiling code.
## install.packages("remotes")
remotes::install_github("hypertidy/textures")
A Mercator raster on a single quad. Zoom in and out but no translate or pivot.
Maps an image onto a quad from a PNG file. Run this code and zoom in and out.
library(textures)
## create a temporary file and write an image to it
tfile <- tempfile(fileext = ".png")
png::writePNG(ga_topo$img/255, tfile)
## create a quad *canvas*, a single 4-corner shape floating in 3D
## (and use the PNG file as the material to texture that canvas)
quad0 <- quad_texture(c(1, 1), extent = ga_topo$extent, texture = tfile, )
## plot it in 3D
rgl::open3d()
rgl::plot3d(quad0, specular = "black")
set_scene() ## this sets the plot up to appear like a 2D image
Maps are fun but R is not just about geography.
library(ggplot2)
library(rgl)
## create a plot and save it
g <- ggplot(mpg, aes(displ, fill = drv)) +
geom_histogram(binwidth = 0.5) +
facet_wrap(~drv, ncol = 1)
g
tfile <- tempfile(fileext = ".png")
ggsave(tfile, g)
library(textures)
quad0 <- quad_texture(dimension = c(92, 102), texture = tfile)
ex <- -20
## flip it (fixme later)
quad0$vb[1L, ] <- 1-quad0$vb[1L, ]
quad0$vb[2L, ] <- 1-quad0$vb[2L, ]
quad0$vb[1L,] <- scales::rescale(quad0$vb[1,], to = c(-1, 1) * ex)
quad0$vb[2L,] <- scales::rescale(quad0$vb[2L,], to = c(-1, 1) * ex)
f <- function(x, y) { r <- sqrt(x^2+y^2); 10 * sin(r)/r } ## ?persp
quad0$vb[3L, ] <- f(quad0$vb[1L,], quad0$vb[2L,])
## not working atm ...
#quad0 <- addNormals(quad0) ## we are still in rgl scope, so everything is available
## plot it in 3D
rgl::open3d()
rgl::plot3d(quad0, specular = "black")
rgl::aspect3d(1, 1, .3)
#set_scene(phi = 15, interactive = TRUE)
par3d(windowRect = c(0, 0, 1024, 1024))
see ./rough-examples.R WIP
Please note that the textures project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.