3D Surface Plotter

The basic operators +, -, *, /, ^ (power) and parentheses for grouping, plus the functions sin, cos, tan, sqrt, abs, exp, and log, and the constants pi and e. Only x and y are recognized as variables, since z is what you're solving for, not something you enter.

Either the expression has a syntax problem (a missing parenthesis, a stray character, an unknown function name) or it's undefined everywhere across your chosen X and Y range (for example 1/(x-x), which is always a division by zero). The error message describes which one it is so you know whether to fix your typing or widen your domain.

Drag the Azimuth slider to spin the view around the surface horizontally, and the Elevation slider to tilt your viewing angle up or down, from looking straight down at the surface to looking at it edge-on. The Auto-Rotate button spins the azimuth continuously if you'd rather just watch it turn.

Color represents height (the function's output value at that point), blue for the lowest values in view, through green and yellow, up to red for the highest, using the same color key shown next to the plot. This makes the surface's shape readable even from a top-down angle where the wireframe lines alone wouldn't show much depth.

A wireframe avoids the visual glitches that come from getting the drawing order wrong on a solid surface (parts that should be hidden behind the surface showing through), while still clearly conveying the shape, and it stays fast even at higher grid resolutions since there's far less to draw than filled, shaded polygons.

It controls how many sample points are calculated across your X and Y range, a higher resolution means a denser mesh and a smoother-looking surface, especially for functions with sharp curves, at the cost of more computation each time you adjust anything. Lower it if the plot feels sluggish while you're experimenting with a function.

Yes. Points where the function is undefined (like dividing by zero, or the square root of a negative number) are simply skipped rather than breaking the whole plot, so you'll see gaps in the wireframe at those spots instead of an error, as long as the function is valid somewhere in your chosen range.

No. The expression you type is parsed and evaluated entirely in your browser using a small built-in math parser, not sent to a server or evaluated with a generic (and riskier) code-execution function. Nothing about what you plot ever leaves your device.