[Bf-committers] Cycles relation between displacement and geometry coordinates

[Tobias Oelgarte]

In Cycles the material has a displacement output which accepts a value. 
But what is the relation between this value and the "actual height" 
compared to the geometry?

I mean if i connect texture with values from 0.0 to 1.0 to this output, 
is it interpreted as a height difference of 1BE in Worldspace? I think 
the difference is much lower, but I don't know how the value is interpreted.

Currently, I'm working on some fancy stuff and I need to compute the 
derivative of a bump map to make it work (same texture twice, one with 
derivative offset, subtracted from each other, ...). But without knowing 
the relation between the simulated/rendered height and the actual space 
it's just measuring over the thumb.

Greetings from
Tobias Oelgarte