Each triangle is \(([k_1S_1(1-t)+k_2S_2t]-\pi)A\) for some permutation $\pi$ where $A$ is a fundamental alcove for the affine Weyl group, $A_2$.
S0:
[ [0,0], [0,0] ]
S1:
[ [1,0], [0,1] ]
<--
-->
S0:
[ [0,0,0], [0,0,0], [0,0,0] ]
S1:
[ [1,0,0], [0,1,0], [0,0,1] ]
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Read K1:
Set K1
Read K2:
Set K2
Read t:
Set t
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