The R package dddr is a
vctrs-based package for working
with three-diensional spatial data. It gives three-dimensional objects
like points, velocities, and rotations first-class vector status in R,
enabling usage as column types within data.frame and tibble.
In contrast to most spatial R packages like sf or rspatial that work
with geographic, 2-dimensional data, dddr works best with
3-dimensional data. The origin of this package was to analyze behavioral
data (e.g, hand motion, head direction) in studies of virtual and
augmented
reality.
library(tidyverse)
library(dddr)spiral <- tibble(i = seq(0, 10*pi, 0.05)) %>%
mutate(
# vector3s are created using three numeric vector arguments,
# and thanks to dplyr, can refer to other columns in the dataframe
circular_part = vector3(x=cos(i), y=sin(i), z=0),
forward_part = vector3(x=0, y=0, z=i/15),
# vector3s can be added together and multiplied by numerics
spiral_part = circular_part * i / 30 + forward_part
)
spiral %>% head(10)## # A tibble: 10 x 4
## i circular_part forward_part spiral_part
## <dbl> <vct3> <vct3> <vct3>
## 1 0 (1 , 0 , 0) (0, 0, 0 ) (0 , 0 , 0 )
## 2 0.05 (0.999, 0.0500, 0) (0, 0, 0.00333) (0.00166, 0.0000833, 0.00333)
## 3 0.1 (0.995, 0.0998, 0) (0, 0, 0.00667) (0.00332, 0.000333 , 0.00667)
## 4 0.15 (0.989, 0.149 , 0) (0, 0, 0.01 ) (0.00494, 0.000747 , 0.01 )
## 5 0.2 (0.980, 0.199 , 0) (0, 0, 0.0133 ) (0.00653, 0.00132 , 0.0133 )
## 6 0.25 (0.969, 0.247 , 0) (0, 0, 0.0167 ) (0.00807, 0.00206 , 0.0167 )
## 7 0.3 (0.955, 0.296 , 0) (0, 0, 0.02 ) (0.00955, 0.00296 , 0.02 )
## 8 0.35 (0.939, 0.343 , 0) (0, 0, 0.0233 ) (0.0110 , 0.00400 , 0.0233 )
## 9 0.4 (0.921, 0.389 , 0) (0, 0, 0.0267 ) (0.0123 , 0.00519 , 0.0267 )
## 10 0.45 (0.900, 0.435 , 0) (0, 0, 0.03 ) (0.0135 , 0.00652 , 0.03 )
spiral %>%
# field access uses the $ operator
ggplot(aes(vector3=spiral_part)) +
stat_point3(geom="point") +
#geom_path3() +
coord_look_at_front()
spiral %>%
mutate(
# rotations can be specified using quaternions, axis / angle, or even from / to vectors
spiral_rotated = rotate(spiral_part, axis=vector3(0, 1, 0), angle=pi/4)
) %>%
ggplot(aes(x=spiral_rotated$x, y=spiral_rotated$y)) +
geom_point() +
geom_path() +
coord_equal()
simple_dddr_plot <- function() {
spiral <- tibble(i = seq(0, 10*pi, 0.05)) %>%
mutate(
circular_part = vector3(x=cos(i), y=sin(i), z=i/15),
forward_part = vector3(x=0, y=0, z=i/15),
spiral_part = circular_part * i / 30 + forward_part
)
spiral %>%
ggplot() +
stat_point3(aes(vector3=spiral_part)) +
coord_look_at_front()
}install.packages("devtools") # if you have not installed "devtools" package
# For the most recent packaged & released version
devtools::install_github("MrMallIronmaker/dddr@*release")
# For the development version
devtools::install_github("MrMallIronmaker/dddr")If you have questions in how to use this library, what this library is
useful for, or if it has any particular features, it would be helpful to
contact me directly at mrmillr at stanford.edu. This project is in its
early development stages, and I want to know how you want to use the
library / are using the library.
Contributions are welcome! The issue tracker in this repo can be used for bug reports, feature requests, and questions - whatever you might need.
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