Handkerchief SurfaceGraphics by Paul BourkeMay 2000
y = v z = u3 / 3 + u v2 + a (u2 - v2) -1 <= u <= 1, -1 <= v <= 1, a = 1 (for example)
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Handkerchief SurfaceGraphics by Paul BourkeMay 2000
y = v z = u3 / 3 + u v2 + a (u2 - v2) -1 <= u <= 1, -1 <= v <= 1, a = 1 (for example)
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