On April 1, 2009, an OpenGL Shader Model 3.0 renderer was revealed to have been developed for "EDuke32", named "Polymer" to distinguish from Ken Silverman's "Polymost". It allows for much more modern effects such as dynamic lighting and normal mapping. Although Polymer is fully functional, it is technically incomplete and unoptimized, and is still in development. As of the fifth installment of the "High Resolution Pack", released in 2011, the Polymer renderer is mandatory. In 2011, another significant development of "EDuke32" was the introduction of true room over room (TROR), where sectors can be placed over other sectors, and can be seen at the same time. In practice, this allows for true three-dimensional level design that was previously impossible, although the base engine is still 2D.