draw a single tree
tree3D(tree = NULL, offset = c(0, 0, 0), col = c("#22BB22", "33FF33"),
opacity = 1, faces = 19)
one column of the Patch-class
vegetation data.frame slot
x/y center and surface (z) of the respective patch
crown colors for the shade classes
alpha value for the tree crown (heavy impacting performance)
number of faces/triangles used per stem and tree cone 3-times for ellipsoid.