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

Brecht Van Lommel brechtvanlommel at pandora.be
Mon Mar 26 12:43:48 CEST 2012

It's currently 0.1 blender units. That's quite arbitrary, have been
meaning to add a value to control this but haven't gotten to it yet.


On Sat, Mar 24, 2012 at 4:58 PM, Tobias Oelgarte
<tobias.oelgarte at googlemail.com> wrote:
> 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
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