I have a complex surface (real dimension 2) in $\mathbb{C}^2$ with coordinates $(z,w)$ given explicitely: for any $\xi \in \mathbb{C}$ I know points $w(\xi)$ of intersection of surface with complex line $z = \xi$. I have to draw it's projection on fixed 3d plane. Please help me with algorithm.
Drawing 3d projection of complex surface
algorithms;matlab;complex analysis
Since you have an explicit parametric representation, the easiest way is direct rasterization of a rectilinear patch.  You don't say what kind of projection you want, so for concreteness say we want an orthographic (orthogonal) projection onto a 3D hyperplane defined by a linear function $A : \mathbb{R}^3 \to \mathbb{R}^4 = \mathbb{C}^2$.  Given a point $y \in \mathbb{R}^4$, the projection is defined by minimizing$$|y - Ax|^2 = |y|^2-2y^TAx+x^TA^TAx$$over $x \in \mathbb{R}^3$.  The minimum is attained at$$x = (A^T A)^{-1} A^T y$$Now pick a 2D grid of points $z_i \in \mathbb{C}=\mathbb{R}^2$, map them to 4D with your function, and project them back to 3D with the above formula.  The result can be passed to a suitable plotting function (I don't know Matlab so I don't know which).