I'm trying to draw the function $f(x,y) = -\log(x)-\log(y)$ as a surface with pgfplots. In order to get smooth level curves, I use a patch plot with patch type=biquadratic.
I am looking for program/package recommendations for drawing graphs. I know similar questions have been asked before, but I have some pretty specific needs because of the project I'll be working on.
I use this code
I have been using pst-solides3d to generate surfaces and then importing them to Adobe Illustrator to turn them into a gradient mesh. The procedure can be time consuming if I want to be very precise, ...
I need help to draw an arbitrary surface in TikZ, in order to represent a manifold. I am trying to make something with shade. I manage to get a rectangular surfcace with corners, shaded color, etc but ...