The extrusion and modifier classes in Away3D can be used to quickly create complex 3D objects to represent objects like terrain, walls, flags, ribbons, and more. The PathExtrusion, LinearExtrusion, and LatheExtrusion classes will extend a base profile along a path or around an axis, while the SkinExtrusion class can be used in conjunction with the Elevation class to create a 3D object from a height map.

We also looked at the ElevationReader class, which provides a convenient way to determine the height of a SkinExtrusion 3D object. A sample application was shown that used the ElevationReader class to move a sphere over the surface or a SkinExtrusion 3D object.

Finally, we covered the HightMapModifier class, which will use a height map to apply a deformation to any 3D object.

In the next chapter, we will take a look at how to add visual effects to an Away3D application, using both the Flash filter classes, and those that are included as part of Away3D.