[Sidefx-houdini-list] Linear Workflow

Mario Marengo mario at axyzfx.com
Wed Aug 25 15:07:37 EDT 2010


In the Mantra ROP, try setting "Color Space" (vm_colorspace) to "Gamma 2.2". 
This parameter is now always exposed in H11. It should help with the bottom-
end noisiness (it biases the sampling importance so the dark stuff gets some 
extra love).


On Wednesday 25 August 2010 02:52:54 pm Andy Nicholas wrote:
> Hi guys,
> We've just started a job in Houdini and we're trying to use a linear
> colour workflow. With the test I'm doing at the moment, I don't have any
> textures, it's all pure lighting and shader models. I've got the Color
> Correction gamma setting at 2.2 which I believe is the correct setting as
> it visually matches what we do in XSI when we enable colour management.
> 
> The problem is that we're having a few issues with generating glossy
> reflections because noise that wasn't visible before, now shows up a
> treat, even with a large number of samples.
> 
> This is partly because the objects I'm reflecting are quite small, so in a
> way, I'm not surprised I'm getting some noise. The issue is that before
> using colour management, this wouldn't have been visible. On a black
> background typically some of the noisy pixel values are only at around
> 0.0002, but they still show up as little grey splats on the image.
> 
> I've been doing a few tests, and while I get noisier results in mental ray
> (using XSI with colour management enabled), it generally isn't as bad as
> I'm seeing in Mantra.
> 
> So my simple question is, have any of you guys run into similar problems,
> and if so, what strategies did you use to work around this issue? (or
> alternatively, are we just doing something stupid?!)
> 
> Thanks,
> 
> Andy
> 
> 
> 
> 
> 
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-- 
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Mario Marengo                                  mailto:mario at axyzfx.com
AXYZ ANIMATION                                 http://www.axyzfx.com
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