Hi Tim,
Nodes > Mixers > Gradient. Set it to black and white and plug your occlusion shader in the gradient input.
Then you can change the "mid color" slider or add some colors in this gradient to control the dark/bright from occlusion as you want.
Cheers.
On 4/29/06, Tim Leydecker <BauerOink(at)gmx.de> wrote:
Hi folks,
I´m currently trying both mib_ambient_occlusion and the
XSI 5.01 XSIAmbientOcclusion shader as a lightshader
(e.g. sampling an environment texture) as described here,
http://www.lamrug.org/resources/doc/occlusion_tutorial.pdf
setup basically similar to pages 9 and 19, exept that I use
a tiny 8bit file to reduce the amount of sampling rays
required for clean results, also because I don´t have
access to a fully functional *.exr creation/manipulation app.
the results are quite fine allready (Thanks again to Harry Bardak)
but now I´d like to improve the tonemapping between Bright
color and Dark color, like using a gradient/curve to soften the
effect in heavily occluded areas *without* simply turning up
the Dark color value. Is there a way to do this without piping
a colorcorrection node inbetween the AO_out and (material)ambient?
I don´t want to chop into my tonalrange by stretching things out
but would like to have extra steps...or is there enough room for
CC in the rendertree (
e.g. 32/64bit calculation)?
To get an idea what I look for, please compare the images of
mib_fg_occlusion and mib_ambient_occlusion on page 19
of the above *.pdf (Thanks for putting it together guys!).
You´ll notice the FG occlusion looks more *elegant* compared
to the mib_occlsion looking like it´s been *autocontrasted*.
Any help appreciated, as I said, my results are rewarding allready
(given my level of experience and ressources) but I still try to improve...
Cheers
tim
environmet
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Guillaume Laforge
freelance TD | cg Artist
