[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/source/blender/blenkernel BKE_node.h blender/source/blender/blenkernel/intern node_shaders.c

[Johnny Matthews]

Also the benefit of this node is that it you do not need to set a fixed
range. Sure a curves node for values would be good too.

Look here for the function

http://mathworld.wolfram.com/SigmoidFunction.html

the function is defined as 1/(1+e^(-x))

so the node does

1/(1+e^(-(x-center)*width))


On 8/4/06, Branan Riley <branan at gmail.com> wrote:
>
> I tried that, kept getting segfaults no matter how I set it up. The
> curves widget itself is designed to check what sort of curve you want
> (vector, rgb, etc.) I tried adding a value option, but couldn't get it
> to work. I probably missed something, though.
>
> Branan
>
> On 8/4/06, Joe Eagar <joeedh at gmail.com> wrote:
> > Johnny Matthews wrote:
> > > guitargeek (Johnny Matthews ) 2006/08/03 15:22:51 CEST
> > >
> > >   Modified files:
> > >     blender/source/blender/blenkernel BKE_node.h
> > >     blender/source/blender/blenkernel/intern node_shaders.c
> > >
> > >   Log:
> > >   --Value Squeeze Node--
> > >
> > >   This material node takes an input value of any size and fits it to a
> sigmoid curve (value between 0 and 1) The width of the curve can set to make
> the sigmoid fall off faster (bigger number) or slower (smaller number) and
> the centerpoint (what value is mapped to 0.5) can be adjusted as well.
> Anyone smarter than me can feel free to tweak this and make it better.
> > >
> > >
> > Why not just add new Curves Node for values?
> >
> > Joe
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-- 
Johnny Matthews
johnny.matthews at gmail.com
Check out my blog at - http://johnnygizmo.blogspot.com

"Any sufficiently advanced technology is indistinguishable from magic."
- Arthur C. Clarke
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