draw_elev3Drgl_OCN: Plot 3D map of elevation generated by an OCN via rgl...

In OCNet: Optimal Channel Networks

Plot 3D map of elevation generated by an OCN via rgl rendering

Description

Function that plots the 3D elevation map generated by an OCN.

Usage

draw_elev3Drgl_OCN(OCN, coarseGrain = c(1, 1), chooseCM = FALSE,
  addColorbar = FALSE, drawRiver = FALSE, thrADraw = 0.002 *
  OCN$FD$nNodes* OCN$cellsize^2, riverColor = "#00CCFF", 
  min_lwd = 1, max_lwd = 8, ...)

Arguments

OCN	A river object as produced by landscape_OCN.
coarseGrain	2x1 vector (only effective if chooseCM = FALSE). For aesthetic purposes, the elevation map can be coarse-grained into a OCN$dimX/coarseGrain[1]-by-OCN$dimX/coarseGrain[2] domain, where each cell's elevation is the average of elevations of the corresponding coarseGrain[1]-by-coarseGrain[2] cells of the original elevation field. coarseGrain[1] and coarseGrain[2] must be divisors of OCN$dimX and OCN$dimY, respectively. coarseGrain = c(2,2) is often sufficient to achieve a good graphical results for large (i.e. at least 100x100 nodes) OCNs.
chooseCM	Index of catchment to display (only effective if OCN$nOutlet > 1). It can be a logical, or a scalar within 1:length(OCN$nOutlet). If TRUE, the catchment with largest area is displayed. Note that, if the size of the chosen catchment is too small (e.g. OCN$CM$A[chooseCM] < 5*OCN$cellsize^2), an error might occur due to failure in triangulation.
addColorbar	If TRUE, add colorbar to the plot.
drawRiver	If TRUE, draw the OCN on top of the elevation field.
thrADraw	Threshold drainage area value used to display the network.
riverColor	Color used to plot the river.
min_lwd, max_lwd	Minimum and maximum values of line width used to display the OCN (actual line width is proportional to the square root of drainage area).
...	Further parameters passed to function persp3d. The default value for aspect is c(OCN$dimX/sqrt(OCN$dimX*OCN$dimY, OCN$dimY/sqrt(OCN$dimX*OCN$dimY, 1)).

Details

This function makes use of the rgl rendering system. To export the figure in raster format, use rgl.snapshot. To export in vectorial format, use rgl.postscript (but note that this might produce rendering issues, see rgl for details). The function will attempt at drawing a contour of the plotted entity (i.e. the lattice or a catchment, depending on chooseCM) at null elevation, and drawing polygons connecting this contour with the /catchment contour at the real elevation. If chooseCM != FALSE, this might result in errors owing to failure of polygon3d in triangulating the polygons.

Value

No output is returned.

Examples

## Not run: 
draw_elev3Drgl_OCN(landscape_OCN(OCN_20))

## End(Not run)

## Not run: 
# 1a) draw the 3D representation of a single catchment within an OCN 
# generated with nOutlet = "All" and add draw the river on top of it
OCN <- landscape_OCN(OCN_400_Allout, displayUpdates = 2) # this takes some minutes
draw_elev3Drgl_OCN(OCN, chooseCM = 983, drawRiver = TRUE)

# 1b) draw the 3D representation of the largest catchment within the OCN 
# (here polygon3d may fail at plotting the polygon at zero elevation)   
draw_elev3Drgl_OCN(OCN, chooseCM = TRUE) 

# 1c) draw the 3D representation of the whole OCN
# and enhance the aspect ratio of Z coordinates 
# with respect to the default value (the final result will be ugly):  
draw_elev3Drgl_OCN(OCN, aspect = c(1, 1, 0.2))

# 1d) same as above, but operate coarse graining for better aesthetics: 
draw_elev3Drgl_OCN(OCN, coarseGrain = c(5,5), aspect = c(1, 1, 0.2))

# 2) draw the 3D representation of a single catchment of an OCN generated
# with periodicBoundaries = TRUE
# (note that the real shape of the catchment is drawn)
OCN <- landscape_OCN(OCN_300_4out_PB, displayUpdates = 2) # this takes some minutes
draw_elev3Drgl_OCN(OCN, chooseCM = TRUE) 

## End(Not run)

OCNet documentation built on Sept. 12, 2025, 10:19 a.m.