# test the redenbach erosion terms
# | W\ominus S(u,e,r)|
# with double cone S with direction u, half-angle e and range r.
W <- cbind(0:1, c(0,2))
u <- c(1,0)
eps <- pi/10
r <- 0.1
plot(W, asp=1)
rect(0, 0, 1, 2)
#xy <- #
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