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@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

In the next Image you can see the difference between single-scattering and multiple-scattering Image 1: Bidirectional Pathtracing (MultipeScattering) Image 2: Sampling a Particle-Point on the Edge from a Eye-Subpaht (Dont know the offizial name from this path-creation-sampling-routine) (MultipeScatt...

Step 2: Rayleigh- and Mie-Scattering. For Rayleigh-Phase-Function-Direction-Sampling I used 'Importance sampling the Rayleigh phase function from jeppe' (Inverse CDF) For the Mie I use tabulation and the formula from 'ScratchAPixel Simulating the Colors of the Sky' For distancesamling, I use Raab-Wo...

Ok here is my first little step to subsurface scattering. I have extended my bidirectional pathtracing with Homogen-Media-Support. So I have now a unbiased estimator. The next steps will be Rayleigh,Mie-Scattering and inhomogeneous media.

I have used a sphere-light far away from the window instead a plain surface-light nearby the window. This leads to better shadows on the ground now.