turn angle into unitary complex number

transport angle along this HalfEdge

* evaluate a chebyshev series * adapted from fortran csevl */

* from the original fortran inits * april 1977 version. w. fullerton, c3, los alamos scientific lab. * * initialize the orthogonal series so that

PS: gross. but this is gotta be good enough for now (amortized cost is constant)

gjj = |e_{ij}|^2, gjk = <e_{ij}, e_{ik}>, gkk = |e_{ki}|^2

gii = |e_{ki}|^2, gij = <e_{ki}, e_{kj}>, gjj = |e_{jk}|^2

accumulator function for Energy matrix coefficient along this edge

accumulator function for mass matrix coefficient along this edge

additional rotation form // REMOVE w

energy minimizer

new version which uses closed form integrals

alignment with q slot at vertices code; typically q is the Hopf differential, but could be something else; here we will assume however that it is the

PS only needed by old code and dual code return the 3-space vector corresponding to the distinguised direction

mean of vertex coordinates

returns true if the vertex is not contained in any face or edge; false otherwise

unit normal

angle from f to t in the plane orthogonal to N

distinguished direction at this edge PS: only needed for old code

IMPLEMENTATION:

which of the 3 possible choices is v? (used to figure out whether a given vertex is i, j, or k (so to speak)

area weighted normal