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I have now implemented Hdr-Environmentlighting. Here is a scene with blue sky

Here the next little improvement. I got the tip from papaboo in this post: If you already have the VNDF sampling from the 2014 paper then implementing the new is trivial. It's the same set of samples with the same PDF, so you just have to copy paste the reference sample method and then you'll have f...

At the moment I'm working on Hair- and SSS-Bsdfs.

I have improved my parallax-mapping and now the pillar on the left looks better:

The Dragon looks good. Which Brdf-Model are you using?

@Dawelter: I have tryed UPBP on the Sky/Cloud-Scene. It works yes but in this scene I use a Directional-Lightsource for the Sun. If I create a volumetric Photonmap for the Beam2Beam, Point2Point and Beam2Point-Querrys, than only few Photons are stored in the View-Frustum. This is, because the View-F...

He ultimatemau, thank you for you answer. All the Papers sounds good. I will look on that.

The next little step: Unifying Points, Beams, and Paths in Volumetric Light Transport Simulation (UPBP) Finally after writing 435 UnitTests, to test every single Class/Sampler/SubPathSampler/FullPathSampler/PathcontributionCheck/Pdf match with Histogram-Test, I can now finally say, that I have maste...

Ok. Here is my next Participating-Media-Image: Clouds :o :o :o . For the sky I use the Model from Nishita and for the clouds the cumulus-cloud-modul from David Ebert. The images a rendered with 200 Samples per Pixel. I use lightsourcesampling on random points on the eye-path-segments and lightsource...

And this the Mirror-Box. Got the idea from dawelter^^

This is the well known water-cornellbox