search for: nacol

...e classes and colors instead of a continuous ramp slice3D(x, y, z, colvar = colvar, theta = 60, col = c("blue", "green", "red"), breaks = c(-0.5, -0.1, 0.1, 0.5)) # now set a vertical slice of the cube to NA colvar[10,,] <- NA # displays as expected; default NAcol = "white" slice3D (x, y, z, colvar = colvar, theta = 60) # does not display as expected--notice # the colors shifted down in value, with NA and -0.5 to -0.1 now both white. slice3D(x, y, z, colvar = colvar, theta = 60, col = c("blue", "green", "red")...