My first Supersize-Image

Show-off, reference material & tools.
XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Fri May 03, 2019 3:45 am

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.
Attachments
Media-Cornellbox.jpg
Media-Cornellbox.jpg (24.46 KiB) Viewed 677 times

XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Sat Jun 15, 2019 8:39 pm

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-Woodcock 'Unbiased Global Illumination with Participating Media - Raab et al (2008)'.

For the attenuation-term I use a pre-computed table. A little Idea how to implement I used the paper from Nishita 'Display Method of the Sky Color Taking into Account Multiple Scattering 1996'.

The next step is adding clouds.
Attachments
SkyRowImages.jpg
SkyRowImages.jpg (182 KiB) Viewed 591 times

XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Mon Jun 24, 2019 3:56 am

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) (MultipeScattering)
Image 3: Sampline a Particle-Point only on the edge from the Primary-Ray (Single Scattering)
Image 4: Create 20 Segments on the Primary-Ray-Edge and connect it to the sun (Single Scattering)
Attachments
SkyCompare.jpg
SkyCompare.jpg (134.22 KiB) Viewed 538 times

XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Mon Aug 05, 2019 4:16 am

This is the well known water-cornellbox :)
Attachments
WasserBox.JPG
WasserBox.JPG (210.64 KiB) Viewed 396 times

XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Tue Aug 06, 2019 5:23 am

And this the Mirror-Box. Got the idea from dawelter^^
Attachments
MirrorBox.jpg
MirrorBox.jpg (394.85 KiB) Viewed 379 times

dawelter
Posts: 41
Joined: Sun Oct 29, 2017 3:15 pm
Location: Germany

Re: My first Supersize-Image

Post by dawelter » Fri Sep 06, 2019 12:15 pm

Nice progress! :)

XMAMan
Posts: 22
Joined: Tue Dec 01, 2015 7:52 am
Location: Germany, Dresden

Re: My first Supersize-Image

Post by XMAMan » Thu Oct 03, 2019 7:41 am

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 lightsourcesampling also for the eye-path-points to create a path from the camera to the light.
Attachments
Wolken_Tag-und-Nacht.jpg
Wolken_Tag-und-Nacht.jpg (103.8 KiB) Viewed 121 times

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