PrologEpilog.

JavaView shows the Prolog and Epilog Graphics as 2D Graphics inside the 3D room instead of painting on the display window and the wall behind the room, which contains the main model.

JavaView Snapshot	Mathematica Snapshot
JavaView Applet	JavaView Lite Applet

Prolog and Epilog are options for graphics functions which gives a list of graphics primitives to be rendered before resp. after the main part of the graphics is rendered.

In[1]:= pe = Graphics3D[Stellate[Dodecahedron[]], Prolog -> {RGBColor[0., 0., 0.], Polygon[{{1., 1.}, {1., 0.}, {0., 1.}}]}, Epilog -> {RGBColor[1., 0., 0.], Thickness[0.02], Line[{{0.6, 0.9}, {0.776, 0.357}, {0.315, 0.693}, {0.885, 0.693}, {0.424, 0.357}, {0.6, 0.9}}]}]; Show[pe] In[2]:= JavaView[pe]