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#' Load a \code{"surf"} included in \code{ciftiTools}
#'
#' Load a \code{"surf"} object from one of the three 32k anatomical surfaces
#' included in \code{ciftiTools}.
#'
#' The surfaces are from the HCP and are included according to these data use
#' terms: Data were provided \[in part\] by the Human Connectome Project,
#' WU-Minn Consortium (Principal Investigators: David Van Essen and Kamil
#' Ugurbil; 1U54MH091657) funded by the 16 NIH Institutes and Centers
#' that support the NIH Blueprint for Neuroscience Research; and by the
#' McDonnell Center for Systems Neuroscience at Washington University.
#'
#' @param hemisphere \code{"left"} (default) or \code{"right"}
#' @param name The name of the surface geometry to load: \code{"inflated"}
#' (default), \code{"very inflated"}, and \code{"midthickness"}.
#' @param resamp_res The resolution to resample the surfaces to. If \code{NULL}
#' (default) or 32492, do not resample. Note that the barycentric resampling
#' method, which is recommended for anatomical surfaces, will be used.
#'
#' @return The \code{"surf"} object
#'
#' @family reading
#' @family surface-related
#' @export
load_surf <- function(
hemisphere=c("left", "right"),
name=c("inflated", "very inflated", "midthickness"),
resamp_res=NULL) {
name <- match.arg(name, c("inflated", "very inflated", "midthickness"))
hemisphere <- match.arg(hemisphere, c("left", "right"))
hemi <- switch(hemisphere, left="L", right="R")
# Load the inflated surface
surf_fname <- paste0("extdata/S1200.", hemi, ".inflated_MSMAll.32k_fs_LR.surf.gii")
surf <- read_surf(system.file(surf_fname, package="ciftiTools"), hemisphere)
# Replace vertex coordinates if not inflated
if (name != "inflated") {
name2 <- paste0(gsub(" ", "_", name), ".", hemi)
surf$vertices <- ciftiTools.data$surfp[[name2]]
}
# Resample if necessary
if (!is.null(resamp_res) && resamp_res!=32492) {
surf <- resample_surf(surf, resamp_res)
}
surf
}
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