Dear R-helpers, an rgl-ers in particular,
what is the easiest way to plot a section of a plane in 3D, that is given by the xyz coordinates of the outline? Suppose I have a polygon - which I know for sure is a set of coordinates on the same plane. One method I found is to use surf.tri from the geometry package, and then plot the triangles with rgl.triangles. This method is not perfect though, because it makes the convex hull - no good for the polygon below. thanks for your help, Remko # Example polygon in 3D (matrix with tree columns x,y,z) m <- structure(c(-24.71, -36.45, -59.54, -83.97, -112.63, -126.66, -152.79, -171.04, -178.92, -183.71, -189.27, -191.56, -195.98, -203.09, -207.89, -212.12, -216.92, -221.73, -210.58, -199.43, -195.58, -175.38, -161.72, -152.09, -140.75, -123.63, -97.87, -79.04, -69.63, -61.75, -54.08, -38.34, -30.47, -24.71, -15.44, -13.33, -14.26, -17.39, -24.5, -31.92, -52.3, -70.45, -79.41, -89.16, -102.08, -111.61, -119.76, -125.55, -128.56, -132.55, -135.55, -138.55, -132.93, -127.31, -124.91, -125.78, -126.69, -127.42, -124.38, -117.74, -105.69, -88.52, -79.94, -70.97, -59.43, -34.75, -25.78, -15.44, 689.49, 686.54, 680.81, 674.79, 667.78, 664.42, 658.27, 654.05, 652.25, 651.22, 650.06, 649.66, 648.7, 647.04, 645.89, 644.91, 643.77, 642.63, 645.3, 647.98, 648.89, 653.93, 657.35, 659.75, 662.52, 666.66, 672.86, 677.25, 679.44, 681.24, 682.95, 686.44, 688.24, 689.49), .Dim = c(34L, 3L)) # One (wrong) way library(geometry) tm <- t(surf.tri(m, delaunayn(m))) plot3d(m[,1],m[,2],m[,3], type='l', col="black", size=2) rgl.triangles(m[tm, 1], m[tm, 2], m[tm, 3], col="green") ------------------------------------------------- Remko Duursma Research Lecturer Centre for Plants and the Environment University of Western Sydney Hawkesbury Campus Richmond NSW 2753 Dept of Biological Science Macquarie University North Ryde NSW 2109 Australia Mobile: +61 (0)422 096908 www.remkoduursma.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
