rgl (version 0.93.984)

planes: add planes

Description

This adds mathematical planes to a scene. Their intersection with the current bounding box will be drawn.

Usage

planes3d(a, b = NULL, c = NULL, d = 0, ...)
rgl.planes(a, b = NULL, c = NULL, d = 0, ...)

Arguments

a, b, c

Coordinates of the normal to the plane. Any reasonable way of defining the coordinates is acceptable. See the function xyz.coords for details.

d

Coordinates of the "offset". See the details.

...

Material properties. See rgl.material for details.

Value

• A shape ID of the planes object is returned invisibly.

Details

This draws planes using the parametrization $a x + b y + c z + d = 0$. Multiple planes may be specified by giving multiple values for any of a, b, c, d; the other values will be recycled as necessary.

See Also

abclines3d, rgl.abclines for mathematical lines.

triangles3d, rgl.triangles or the corresponding functions for quadrilaterals may be used to draw sections of planes that do not adapt to the bounding box.

Examples

# Show regression plane with z as dependent variable

x <- rnorm(100)
y <- rnorm(100)
z <- 0.2*x - 0.3*y + rnorm(100, sd=0.3)
fit <- lm(z ~ x + y)
plot3d(x,y,z, type="s", col="red", size=1)

coefs <- coef(fit)
a <- coefs["x"]
b <- coefs["y"]
c <- -1
d <- coefs["(Intercept)"]
planes3d(a, b, c, d, alpha=0.5)