3d: Return to basic:
other side: one of considers
0 < t < 1
s = t - 1
L1 and L2 are lines.
t * L1 + s * L2 (formula1)
the above doesn't have parabra.
And, from L1 to L2 are lined if you display fomula1.
The start always has been here.
And, we'd rather love to add elements of control points which has an Anchar and a Line.
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sorry, the above is actually parabola.
L1 depends on the "t".
L2 depends on the "s".
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(20201109)
sorry, the below is parabola.
P( x, y ) = L1 * t*t + L2 * s*s
(20201114: )
p2 and p3 are parabola, which means affect parabola.
p1 and p4 are line.
