Random Gaussian cubic surface Seed: 254 (Gaussian coefficient and line-tracking seed)
Cubic: f(x,y,z) = 0.188 x*z^2 -0.0845 y*z^2 -0.609 z^2 -0.0772 x^2*z -0.226 x*y*z -0.294 x*z -0.0173 y^2*z -0.00576 y*z -0.111 z -0.194 x^3 -0.241 x^2*y -0.147 x^2 +0.0231 x*y^2 -0.0562 x*y -0.0842 x +0.172 y^3 -0.241 y^2 -0.303 y +0.351 1
Affine cubic: f(x,y,z) = 0.188 x*z^2 -0.0845 y*z^2 -0.609 z^2 -0.0772 x^2*z -0.226 x*y*z -0.294 x*z -0.0173 y^2*z -0.00576 y*z -0.111 z -0.194 x^3 -0.241 x^2*y -0.147 x^2 +0.0231 x*y^2 -0.0562 x*y -0.0842 x +0.172 y^3 -0.241 y^2 -0.303 y +0.351 1
Shadow: the quartic B(x,y)^2 - 4 A(x,y) C(x,y) = 0 is drawn on the z=-4 xy-plane in the same 3D scene. The translucent ruled curtain rises upward from the shadow to the ramification curve where the lifted point has z >= -2 and lies above the displayed projection plane. The 3 real projected lines on the xy-plane are bitangents found from the projective lines on the cubic surface. Same-color transparent line projection cones are included but hidden by default; use the page toggle to show them.
Viewing box: axis ranges are [-4, 4].