rgl (version 0.97.0)

spin3d: Create a function to spin a scene at a fixed rate

Description

This creates a function to use with play3d to spin an rgl scene at a fixed rate.

Usage

spin3d(axis = c(0, 0, 1), rpm = 5, dev = rgl.cur(), subscene = par3d("listeners", dev = dev))

Arguments

axis

The desired axis of rotation

rpm

The rotation speed in rotations per minute

dev

Which rgl device to use

subscene

Which subscene to use

Value

A function with header function(time, base = M), where M is the result of par3d("userMatrix") at the time the function is created. This function calculates and returns a list containing userMatrix updated by spinning the base matrix for time seconds at rpm revolutions per minute about the specified axis.

See Also

play3d to play the animation

Examples

# Spin one object
open3d()
plot3d(oh3d(col = "lightblue", alpha = 0.5))
if (!rgl.useNULL())
  play3d(spin3d(axis = c(1, 0, 0), rpm = 30), duration = 2)

# Show spinning sprites, and rotate the whole view
open3d()
spriteid <- NULL

spin1 <- spin3d(rpm = 4.5 ) # the scene spinner
spin2 <- spin3d(rpm = 9 ) # the sprite spinner

f <- function(time) {
    par3d(skipRedraw = TRUE) # stops intermediate redraws
    on.exit(par3d(skipRedraw = FALSE)) # redraw at the end

    rgl.pop(id = spriteid) # delete the old sprite
    cubeid <- shade3d(cube3d(), col = "red")
    spriteid <<- sprites3d(0:1, 0:1, 0:1, shape = cubeid,
                   userMatrix = spin2(time, 
                     base = spin1(time)$userMatrix)$userMatrix)
    spin1(time)
}
if (!rgl.useNULL())
  play3d(f, duration = 2)