Three-dimensional graph
（重定向自Three Dimensional graph）
![This surface consists of points whose coordinates (x, y, z) satisfy the equation z = sin(x2) × cos(y2).](/Images/godic/202502/16/Three-dimensional_graph0135.png")
![A two-dimensional perspective projection of a sphere](/Images/godic/202502/16/Sphere_wireframe_10deg_6r.svg0135.png")
![From economics, an indifference map with three indifference curves shown. All points on a particular indifference curve have the same value of the utility function, whose values implicitly come out of the page in the unshown third dimension.](/Images/godic/202502/16/Simple-indifference-curves.svg0135.png")
A three-dimensional graph is the graph of a function f(x, y) of two variables, or the graph of a relationship g(x, y, z) among three variables.
Provided that x, y, and z or f(x, y) are real numbers, the graph can be represented as a planar or curved surface in a three-dimensional Cartesian coordinate system. A three-dimensional graph is typically drawn on a two-dimensional page or screen using perspective methods, so that one of the dimensions appears to be coming out of the page.