plotmath3d: Generate sprites using base graphics math plotting.
In rgl: 3D Visualization Using OpenGL

Description Usage Arguments Value Note Author(s) See Also Examples

To plot mathematical text, this function uses base graphics functions to plot it to a ‘.png’ file, then uses that file as a texture in a sprite.

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plotmath3d(x, y = NULL, z = NULL, text, cex = par("cex"), adj = par("adj"), 
           pos = NULL, offset = 0.5,
           fixedSize = TRUE, startsize = 480, initCex = 5, ...)

`x, y, z`	coordinates. Any reasonable way of defining the coordinates is acceptable. See the function `xyz.coords` for details.
`text`	A character vector or expression. See `plotmath` for how expressions are interpreted.
`cex`	Character size expansion.
`adj`	one value specifying the horizontal adjustment, or two, specifying horizontal and vertical adjustment respectively.
`pos, offset`	alternate way to specify `adj`; see `text3d`
`fixedSize`	Should the resulting sprite behave like the default ones, and resize with the scene, or like text, and stay at a fixed size?
`startsize, initCex`	These parameters are unlikely to be needed by users. `startsize` is an over-estimate of the size (in pixels) of the largest expression. Increase this if large expressions are cut off. `initCex` is the size of text used to form the bitmap. Increase this if letters look too blurry at the desired size.
`...`	Additional arguments to pass to `text` when drawing the text.

Called for the side effect of displaying the sprites. The shape ID of the displayed object is returned.

The text3d function passes calls to this function if its usePlotmath argument is TRUE. The default value is determined by examining its texts argument; if it looks like an expression, plotmath3d is used.

Duncan Murdoch

text3d

open3d()
plotmath3d(1:3, 1:3, 1:3, expression(x[1] == 1, x[2] == 2, x[3] == 3))
# This lets the text resize with the plot
text3d(4, 4, 4, "resizeable text", usePlotmath = TRUE, fixedSize = FALSE)

Warning messages:
1: In rgl.init(initValue, onlyNULL) : RGL: unable to open X11 display
2: 'rgl.init' failed, running with 'rgl.useNULL = TRUE'. 
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