[Bf-committers] Bias lamps negative values

[Giuseppe Canino]

Hi to everybody,I'm tryng to create a good material in Blender(with the new 
nodes)to render in a nice way sub surface scattering for  human skin .
I have found a way to use shadow maps for this,the result are not 
perfect,but not so bad
I think I'm on the right way:

Test image

http://img104.imageshack.us/my.php?image=skinshadingtest6nj.jpg

Test image(happy buddha from stanford)

http://img159.imageshack.us/my.php?image=testrender8po.png

Shading network

http://img118.imageshack.us/my.php?image=network7rw.jpg

But I think I could make it even better,if the bias parameter of the lamps 
could allow negative value(now the value cannot be negative).
How difficult should be modifying the code to allow negative values?
I don't know if this can cause problems,but if not  it could be a really 
nice addition, we can create
nice translucency effects really easy.
Bye
Pino