I'm beginner with plotting in 3D in R and I need help. I try to plot some easy paraboloid
我是初学者，在R中用3D绘图，我需要帮助。我试图绘制一些简单的抛物面
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:
所以，我的问题是：
-
Can I draw only grid, or make color transparent to see also the part of "at the back"?
我可以只绘制网格，还是使颜色透明，还可以看到“在后面”的部分？
-
How to add points to the plot (on the surface, e.g to draw in other color point (1,1,2))?
如何在绘图上添加点（在表面上，例如以其他颜色点（1,1,2）绘制）？
1 个解决方案
#1
5
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()).
有关表面属性的信息，请参见？material3d。大多数这些属性，例如alpha或front =“line”或back =“line”，可以直接传递给persp3d（）。使用points3d（）（或spheres3d（））添加点。
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
#1
5
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()).
有关表面属性的信息，请参见？material3d。大多数这些属性，例如alpha或front =“line”或back =“line”，可以直接传递给persp3d（）。使用points3d（）（或spheres3d（））添加点。
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