在 rgl 中绘制具有给定坐标的长方体

Question

我正在尝试绘制给定顶点坐标的长方体：(-3,-2,-5), (-3,-2,6), (-3,3,-5), ( -3,3,6), (7,-2,-5), (7,-2,6), (7,3,-5), (7,3,6) 使用 rgl 包.我是通过以下方式完成的：

library(rgl)
vertices1 <- c( 
  -3, -2, -5, 1,
  7, -2, -5, 1,
  7,  3, -5, 1,
  -3,  3, -5, 1
)
vertices2 <- c( 
  -3, -2, 6, 1,
  7, -2, 6, 1,
  7,  3, 6, 1,
  -3,  3, 6, 1
)
vertices3 <- c( 
  -3, -2, -5, 1,
  -3, -2, 6, 1,
  -3, 3, 6, 1,
  -3,  3, -5, 1
)
vertices4 <- c(
  7, -2, -5, 1,
  7, -2, 6, 1,
  7,  3, 6, 1,
  7,  3, -5, 1
)
vertices5 <- c(
  -3, 3, -5, 1,
  7, 3, -5, 1,
  7, 3, 6, 1,
  -3, 3, 6, 1
)
vertices6 <- c(
  -3, -2, -5, 1,
  7, -2, -5, 1,
  7, -2, 6, 1,
  -3, -2, 6, 1

)
indices <- c( 1, 2, 3, 4 )
open3d()  
wire3d( qmesh3d(vertices1, indices) , col = "blue")
wire3d( qmesh3d(vertices2, indices) , col = "blue" )
wire3d( qmesh3d(vertices3, indices) , col = "blue")
wire3d( qmesh3d(vertices4, indices) , col = "blue")
shade3d(qmesh3d(vertices1, indices) , col = "blue", alpha = 0.1)
shade3d(qmesh3d(vertices2, indices) , col = "blue", alpha = 0.1)
shade3d(qmesh3d(vertices3, indices) , col = "blue", alpha = 0.1)
shade3d(qmesh3d(vertices4, indices) , col = "blue", alpha = 0.1)
shade3d(qmesh3d(vertices5, indices) , col = "blue", alpha = 0.1)
shade3d(qmesh3d(vertices6, indices) , col = "blue", alpha = 0.1)

使用 rgl 有更好的方法吗？

Answer 1

更简洁，避免重复一些顶点：

library(rgl)

vertices <- cbind(
  c(-3,-2,-5), 
  c(-3,-2, 6), 
  c(-3, 3,-5), 
  c(-3, 3, 6), 
  c( 7,-2,-5), 
  c( 7,-2, 6), 
  c( 7, 3,-5), 
  c( 7, 3, 6)
)

indices <- cbind(
  c(1, 5, 7, 3),
  c(2, 6, 8, 4),
  c(1, 2, 4, 3),
  c(5, 6, 8, 7),
  c(3, 7, 8, 4)
  c(1, 5, 6, 2)
)

cuboid <- qmesh3d(
  vertices = vertices,
  indices = indices,
  homogeneous = FALSE
)

shade3d(cuboid, color = "blue", alpha = 0.1)
wire3d(cuboid, color = "blue")

在 rgl 中绘制具有给定坐标的长方体

Drawing cuboid with given coordinates in rgl

r

rgl