[snip]

> Yeah ...  It's a crappy, low-res bitmap in the height_field.
> I've been trying to fix it, but everything I try makes it look worse.

Try rendering an orthographic top down view with no lights, ambient 1 gradient y
pattern at large size (depth_map). You can soften/blur that if you like, and
then repeat the depth render with this new image using hf_gray_16 output. You
should wind up with a less 'crappy', hi-res bitmap to use. Just be careful with
your file names. :)

--
light_source{0,1}#macro c(J,a)sphere{0,1pigment{rgb z}scale a translate J+O}
#end#macro B(R,V,O)c(0,4)intersection{c(V,R)difference{c(-z*4x+10)c(-z*4.1x+
10)c(0<7.5,45,5>)}}#end B(12,0z*25)B(8y*4<0,12,50>)          // Batronyx ^"^

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