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drawScene.rgl <- function(scene, add = FALSE, ...) {
loadRGL()
if (! rgl.cur())
open3d()
if (!add)
clear3d()
scene <- colorScene(scene)
triangles <- canonicalizeAndMergeScene(scene, "color", "color2", "alpha",
"col.mesh", "fill", "smooth")
use.col2 <- ! all(is.na(triangles$color2))
if (use.col2 && any(is.na(triangles$color2)))
warning(paste("mixing surfaces with and without color2 may not",
"work properly in the rgl engine"))
col <- rep(triangles$color, each = 3)
if (use.col2)
col2 <- rep(triangles$color2, each=3)
alpha <- rep(triangles$alpha, each = 3)
fill <- rep(triangles$fill, each = 3)
col.mesh <- rep(triangles$col.mesh, each = 3)
data <- zipTriangles(triangles)
if (all(fill)) {
front <- "filled"
back <- "filled"
}
else if (any(fill))
##**** handle these by splitting; OK if no alpha < 1
stop(paste("for now rgl engine cannot handle mixed fill/wire",
"frame surfaces"))
else {
front <- "lines"
back <- "lines"
col <- col.mesh
}
oldstyle = getOption("old.misc3d.orientation")
if (! is.null(oldstyle) && oldstyle) {
data <- data[,c(1, 3, 2)]
data[,3] <- -data[,3]
}
if (any(triangles$smooth > 0)) {
if (any(triangles$smooth == 0))
stop(paste("for now for the rgl engine cannot handle mixed",
"smooth/non-smooth surfaces"))
normals <- zipTriangles(triangleVertexNormals(triangles))
}
else normals <- NULL
if (nrow(data) > 0) # to avoid a segfault in rgl
{
if (! use.col2)
triangles3d(data[,1], data[,2], data[,3],
col = col, alpha = alpha, normals = normals,
front = front, back = back, ...)
else {
triangles3d(data[,1], data[,2], data[,3],
col = col, alpha = alpha, normals = normals,
front = front, back = "cull", ...)
triangles3d(data[,1], data[,2], data[,3],
col = col2, alpha = alpha, normals = normals,
front = "cull", back = back, ...)
}
}
}
renderScene <- function(scene, box, fill, col.mesh, add, engine, polynum,
col.bg, depth, newpage) {
triangles <- canonicalizeAndMergeScene(scene, "color", "col.light",
"col.mesh", "fill")
v1 <- triangles$v1
v2 <- triangles$v2
v3 <- triangles$v3
n.tri <- nrow(v1)
if (fill) {
fill <- rep(triangles$fill, length = n.tri)
col.mesh <- rep(triangles$col.mesh, length = n.tri)
}
else col.mesh <- rep(col.mesh, length = n.tri)
col.fill <- ifelse(fill, triangles$col.light, NA)
z <- (v1[,3] + v2[,3] + v3[,3]) / 3
if (depth > 0) {
rgbcol <- col2rgb(col.fill, alpha = TRUE)/255
rgbcol.bg <- col2rgb(col.bg, alpha = TRUE)/255
s <- (1 + depth * z) / (1 + depth * max(z))
col.fill <- rgb(rgbcol[1,] * s + rgbcol.bg[1,] * (1 - s),
rgbcol[2,] * s + rgbcol.bg[2,] * (1 - s),
rgbcol[3,] * s + rgbcol.bg[3,] * (1 - s),
rgbcol[4,])
}
col.mesh <- ifelse(is.na(col.mesh), col.fill, col.mesh)
i <- order(z, na.last = NA)
if (engine == "grid")
render.grid(v1[i,], v2[i,], v3[i,], box, fill[i], col.fill[i],
col.mesh[i], add, polynum, newpage)
else render.standard(v1[i,], v2[i,], v3[i,], box, fill[i], col.fill[i],
col.mesh[i], add)
}
render.standard <- function(v1, v2, v3, box, fill, col.fill, col.mesh, add) {
if (! add) {
# rr <- screenRange(v1, v2, v3)
rr <- range(box)
plot(rr, rr,type="n", axes = FALSE, ann = FALSE)
}
xx <- as.vector(rbind(v1[,1], v2[,1], v3[,1], NA))
yy <- as.vector(rbind(v1[,2], v2[,2], v3[,2], NA))
polygon(xx, yy, col=col.fill, border=col.mesh)
}
render.grid <- function(v1, v2, v3, box, fill, col.fill, col.mesh,
add, polynum, newpage) {
if (! add) {
if (newpage) grid::grid.newpage()
rr <- range(box)
grid::pushViewport(grid::viewport(w = 0.8, h = 0.8,
xscale = rr, yscale = rr,
name = "misc3dScene"))
on.exit(grid::upViewport())
}
xx <- as.vector(rbind(v1[,1], v2[,1], v3[,1]))
yy <- as.vector(rbind(v1[,2], v2[,2], v3[,2]))
n.tri <- nrow(v1)
idlen <- rep(3, n.tri)
start <- 1
end <- start + polynum - 1
while (start <= n.tri) {
end <- min(end, n.tri)
j <- start : end
j3 <- (3 * start - 2) : (3 * end)
gp <- grid::gpar(fill = col.fill[j], col = col.mesh[j])
grid::grid.polygon(x = xx[j3], y = yy[j3], default.units = "native",
gp = gp, id.lengths = idlen[j])
start <- start + polynum
end <- start + polynum
}
}
makePerspMatrix <- function(d) {
rbind(c(1, 0, 0, 0),
c(0, 1, 0, 0),
c(0, 0, 1, 0),
c(0, 0, -1, 1 / d))
}
## drawScene is a simple function for plotting triangles. The viewer is
## looking down the positive Z axis.
## The returned value is suitable for use with trans3d.
drawScene <- function(scene, light = c(0, 0, 1),
screen = list(z = 40, x = -60),
scale = TRUE,
R.mat = diag(4),
perspective = FALSE,
distance = if (perspective) 0.2 else 0,
fill = TRUE,
xlim = NULL, ylim = NULL, zlim = NULL,
aspect = c(1, 1),
col.mesh = if (fill) NA else "black",
polynum = 100,
lighting = phongLighting,
add = FALSE,
engine = "standard",
col.bg = "transparent", depth = 0, newpage = TRUE) {
scene <- colorScene(scene)
sr <- sceneRanges(scene, xlim, ylim, zlim)
if (add)
rot.mat <- R.mat
else
rot.mat <- makeViewTransform(sr, scale, aspect, screen, R.mat)
scene <- transformScene(scene, rot.mat)
scene <- lightScene(scene, lighting, light)
if (distance > 0) {
scene <- addPerspective(scene, distance)
rot.mat <- makePerspMatrix(distance) %*% rot.mat
}
box <- as.matrix(expand.grid(sr$xlim, sr$ylim, sr$zlim))
box <- trans3dto3d(box, rot.mat)
renderScene(scene, box, fill, col.mesh, add, engine, polynum,
col.bg, depth, newpage)
invisible(t(rot.mat))
}
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