How to Make Polygons "3D Shape Files"

This will make them work within a view or in a 3D scene.

1. Load spatial analyst and 3D analyst
2. Load a grid
3. Load the shape file that you want to make "3D." It must cover some or all of the area covered by the grid
4. With the original shape file active, choose Theme/convert to 3D shape file.
5. Choose get z values from surfaces.
6. Elect surface to be the elevation grid.
7. Accept default on sample distance on grid.
8. Specify an output file name and location.

To make it look 3d in the view:

1. Compute a hillshade for the original grid
2. Convert your new theme to a grid: make it active, choose Theme/convert to grid, output grid extent = same as your new 3D file just created, output grid cell size = same as original grid.
3. In "conversion field" box, choose whichever field you want the different colors to represent (Formation in BIBEG theme, for example).
4. Edit the legend on this new grid, press Advanced, set brightness theme to "hillshade of original grid."

To put this into a 3D scene: go to a new 3D scene, load the grid, go to theme/3D properties, set surface to original grid, set on = show shading for features.