CODEWITHSUNDEEP
rgraphics3d
jjankowiak
jjankowiak

Reputation: 3279

Adding points to 3d plot in r

I'm beginner with plotting in 3D in R and I need help. I try to plot some easy paraboloid

library(rgl)
x <- seq(-1,1, 0.2)
y <- x
f <- function(x,y){
   -(x^2+y^2)
}
z <- outer(x,y, "f")
persp3d(x, y, z, col="gray")

So, my questions are:

  1. Can I draw only grid, or make color transparent to see also the part of "at the back"?

  2. How to add points to the plot (on the surface, e.g to draw in other color point (1,1,2))?

Upvotes: 8

Views: 6488

Answers (1)

Ben Bolker
Ben Bolker

Reputation: 226332

See ?material3d for information on surface properties. Most of these properties, such as alpha or front="line" or back="line", can be passed directly to persp3d(). Add points with points3d() (or spheres3d()).

persp3d(x, y, z, col="gray", alpha=0.5)
points3d(1,1,2,col="red")
persp3d(x, y, z, col="gray", front="line", back="line")
spheres3d(1,1,2,col="red",radius=5)  ## appropriate radius: I used x <- y <- 1:20

Upvotes: 7

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