[away3d] Custom depth shader

[OnionRing]

Hello all! So, I'm looking to get the effect of the
DepthBitmapMaterial, only without the whole Bitmap thing, and without
all the pretty smooth shading that makes it run kinda slow. You all
think it would be worthwhile for me to write up a sort of
DepthColorMaterial, where it gives the kind of high-contrast
polygonned effect that the PhongColorMaterial gives, only using depth
for shading?