使用r中的Plot3D包增加3D表面图厚度

Question

有没有办法使用R中persp3D包中的plot3D函数来增加3D曲面图厚度，如图here？似乎无法在文档中找到任何内容。

谢谢

Answer 1

我能够通过创建多个曲面并使用plot3D函数的curtain参数连接它们来实现此功能。厚度由每个表面的z参数控制。如果有人需要示例代码，这里是;

为简单起见，我使用米来指定表面的厚度/高度

library(plot3D)
library(plot3Drgl)

# volcano data range
clim <- range(volcano)

# Surface 1
persp3D(z = volcano, zlim = c(0, 600), clim = clim, 
        box = FALSE, plot = FALSE, curtain = TRUE, border = "black")

# Surface 2 - 20m below surface 1
persp3D(z = volcano - 20, clim = clim, colvar = volcano, 
        add = TRUE, colkey = FALSE, plot = FALSE, curtain = TRUE, border = "black")

# Surface 3 - 40m below surface 1
persp3D(z = volcano - 40, clim = clim, colvar = volcano, 
        add = TRUE, colkey = FALSE, plot = FALSE, curtain = TRUE, border = "black")

# Surface 4 - 60m below surface 1
persp3D(z = volcano - 60, clim = clim, colvar = volcano, 
        add = TRUE, colkey = FALSE, plot = TRUE, curtain = TRUE, border = "black")

# Surface 5 - 80m below surface 1
persp3D(z = volcano - 80, clim = clim, colvar = volcano, 
        add = TRUE, colkey = FALSE, plot = TRUE, curtain = FALSE, border = "black")

# Open rgl for interactive viewing
plotrgl()

Answer 2

我不了解plot3D，但rgl没有具体的功能。这样做的方法是计算与板边缘对应的多边形，并使用polygon3d绘制这些多边形。例如：

data(volcano)
persp3d(volcano, col = "green")

# The bottom of the slab
persp3d(volcano-10, col = "blue", add = TRUE)

minx <- 0
maxx <- 1
miny <- 0
maxy <- 1

m <- nrow(volcano)
n <- ncol(volcano)

# The front edge
edgex <- c(seq(minx, maxx, length.out = m),
           seq(maxx, minx, length.out = m))
edgey <- miny
edgez <- c(volcano[,1],rev(volcano[,1] - 10))
polygon3d(cbind(edgex, edgey, edgez), coords = c(1,3), 
          col = "yellow")

# The back edge
edgey <- maxy
edgez <- c(volcano[,n],rev(volcano[,n] - 10))
polygon3d(cbind(edgex, edgey, edgez), coords = c(1,3), col = "white")

edgex <- minx
edgey <- c(seq(miny, maxy, length.out = n),
           seq(maxy, miny, length.out = n))
edgez <- c(volcano[1,],rev(volcano[1,] - 10))
polygon3d(cbind(edgex, edgey, edgez), coords = c(2,3), col = "black")

edgex <- maxx
edgez <- c(volcano[m,],rev(volcano[m,] - 10))
polygon3d(cbind(edgex, edgey, edgez), coords = c(2,3), col = "green")