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Tobias Schwinger (tschw)
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Feb 17 2018, 3:12 PM (82 w, 4 d)

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Feb 21 2018

Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..
color absorption_coeff = max(1.0 - scatter_color, 0.0) * max(1.0 - AbsorptionColor, 0.0);
// (1-s)(1-a) = 1-s-a+sa

AbsorptionColor actually now describes transmission (at some nonlinear scale, due to that sa term that keeps it from underflowing with the chosen inputs).
Is it much better than before? If not, I'd go without, because it's easier to reparametrize externally with just coeff = color * density.

We have low level volume scatter and absorption shader nodes for those who want to do a custom parametrization.

Feb 21 2018, 2:34 PM

Feb 20 2018

Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..

I did some more testing with the scattering and absorption colors and adjusted the code. Here's the new behavior, with and without volume bounces. The colored planes in front show the scatter/albedo and absorption/transmission color parameters.

Feb 20 2018, 5:00 PM

Feb 19 2018

Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..

Having a "color at depth" option like in Luxrender would indeed be helpful when doing visualization work.
[...] Could be handled in the node via a tab.

Feb 19 2018, 1:31 AM

Feb 17 2018

Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..

Right now we have color fields to set the color in a WYSIWYG fashion (check the volume absorption node in Cycles for example)

Feb 17 2018, 4:54 PM
Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..

Having a "color at depth" option like in Luxrender would indeed be helpful when doing visualization work.

Feb 17 2018, 4:20 PM
Tobias Schwinger (tschw) added a comment to D3033: Cycles: add Principled Volume shader..

I'm not entirely happy with it yet, but it's closer.

Feb 17 2018, 3:58 PM