The function that computes the gradient of the energy (or error)
of the deformation of the mesh from the flat outline to the
sphere. This depends on the locations of the points given in
spherical coordinates. The function is designed to take these as a
vector that is received from the optim function.
Usage
Fcart(P, C, L, T, A, R, alpha = 1, x0, nu = 1, verbose = FALSE)
Arguments
P
N-by-3 matrix of point coordinates
C
The connectivity matrix
L
Length of each edge in the flattened outline
T
Triangulation in the flattened outline
A
Area of each triangle in the flattened outline
R
Radius of sphere
alpha
Area penalty scaling coefficient
x0
Area penalty cutoff coefficient
nu
Power to which to raise area
verbose
How much information to report
Value
A vector representing the derivative of the energy of this
particular configuration with respect to the parameter vector