# 3D Viewer › Surface Plot

## How to work with surface plots

You can download example source code for this HowTo here.

Before reading this HowTo, it may be helpful to read The relation between Content and Universe.

Surface plots show a 2D image as a 3D plot, where the 3rd dimension is given by the intensity.

Because only one slice of an image stack can be displayed a time, SurfacePlot2D offers a method to set the displayed slice:

    // Add the image as a volume
Content c = univ.addSurfacePlot(imp);

// Retrieve the SurfacePlotGroup
SurfacePlotGroup splot = (SurfacePlotGroup)c.getContent();

// Scroll through the slices
for(int i = 0; i &lt; 15; i++) {
splot.setSlice(i + 1);

}