\documentclass{standalone} \usepackage{pgfplots} \pgfplotsset{compat=1.14} \begin{document} \begin{tikzpicture} \begin{axis}[view={20}{10},axis lines=none,xmin=-15, xmax=15,ymin=-15, ymax=15,zmin=-1, zmax=4] \addplot3[surf, fill opacity=1, draw opacity=1, shader=interp, colormap={outside}{color=(blue!40) color=(blue)}, point meta=-abs(x), mesh/interior colormap={inside}{color=(red!40) color=(red)}, domain=0.01:15, y domain=0:2*pi, samples=30 ] ({x*cos(deg(y))},{x*sin(deg(y))},{sqrt(x)}); \end{axis} \end{tikzpicture} \end{document}