The Isosurface Tool creates an opaque surface composed of interpolated voxels with the same grey scale value.
To use the Isosurface Tool from the main menu select:
3D Visualizer menu > Algorithms > seeded isosurface
Then with the desired button select:
> Tool Selection Menu > Locator > 6 – DOF Locator
You should now be able to create isosurfaces in your data set. The same process can be done to create “global isosurfaces”. You can also use the “Elements List” to hide, show, and destory created isosurfaces.