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Stefan Werner Profile picture
@stefan_3d
May 23, 2019 • 4 tweets • 2 min read • Read on X
Ich versuche (mehr schlecht als recht) meinen Twitteraccount auf C++, #b3d, ray tracing, und Technik zu beschränken und mich aus Politik rauszuhalten.

Heute eine Ausnahme: Ein Entwurf zur Verschärfung des #WaffG, der Bastler ("Maker"), Heim- und Handwerker betrifft:
Die sogenannten Waffenverbotszonen sollen ausgeweitet werden auf Innenstädte, Schulen, etc. Klingt harmlos?
"waffenähnliche gefährliche Gegenstände gelten zum Beispiel Haushaltsmesser, Schraubendreher, Hammer und andere metallene oder scharfkantige Werkzeuge oder Holzstiele"
Wenn also der Hackspace in der Innenstadt zwei Blocks von euerer Wohnung entfernt ist, kann "mal eben schnell einen Schraubenzieher von zu Hause holen" schon ein Verstoß gegen das WaffG sein.

zdf.de/nachrichten/he…
Gelegenheiten für den unwissentlichen Verstoß gibt es genug. Darf die Tochter zum Wandertag ein Messer dabei haben oder darf sie nur noch braun angelaufene Apfelschnitze aus der Plastikdose essen?

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More from @stefan_3d

Stefan Werner Profile picture
Jul 25, 2022
With @IntelGraphics Arc GPUs launching, I may or may not be sharing some of my experience developing for them here on Twitter.

Is that something you, my follower, would be interested in?
@IntelGraphics I’d be talking about GPGPU development using SYCL. For APIs like DX or Vulkan, you’ll have to ask someone else.
@IntelGraphics First, the basics: What do you need to get started?

I'm using SYCL to develop for Arc. If you don't have Arc hardware, you still can use SYCL: @IntelSoftware 's SYCL compiler supports not only many Intel iGPUs but also Nvidia and AMD GPUs!

intel.github.io/llvm-docs/GetS…
Read 15 tweets
Stefan Werner Profile picture
Sep 24, 2020
@andrewpprice They're not the same thing. If you like, I'd be happy to explain the details to you, but it's too long to fit into a tweet.
@andrewpprice In a super dense format: The first use of ray tracing in computer graphics was proposed in 1968, and was focused on solving the visibility problem, not any light bounces.

dl.acm.org/doi/10.1145/14…
@andrewpprice When in the last century, people were speaking of ray tracing vs rasterisation, they usually meant Turner Whitted's method of computing global illumination through a recursive ray tree.

dl.acm.org/doi/10.1145/35…
Read 13 tweets
Stefan Werner Profile picture
Mar 5, 2020
Thanks to Brecht for reviewing my patch, adaptive sampling has now landed in #b3d #Blender #Cycles.
For those interested in details:
It is following the approach outlined in sections 7.1.3 and 7.2 of this paper describing RenderMan:
graphics.pixar.com/library/Render…

The error metric is from section 2.1 here: pdfs.semanticscholar.org/8329/759ae51c9…
In layman's terms: Every other sample is written to a separate buffer. By comparing this extra buffer to the main image buffer, the renderer can estimate convergence.

Pixels receive progressively more samples until a convergence threshold or sample count limit is reached.
Read 8 tweets
Stefan Werner Profile picture
Oct 30, 2019
I uploaded the slides from my presentation at #bcon19 about Cycles Volume rendering. They include speaker notes, so hopefully they are useful for those who didn't attend or watch the stream.

1drv.ms/b/s!Ap47HIkOUU…
Keep in mind that I prepared this talk on the train to Amsterdam, only to redo it almost completely in my hotel room the night before the presentation. Neither the slides nor the sample images in it are polished.
And while I have your attention, I'd like to point to the fantastic presentation by Rob Silvestri @tangent_anim
Read 4 tweets
Stefan Werner Profile picture
May 27, 2019
Ich finde dieses CDU Zitat entlarvend für alle Parteien:
"Den Grünen ist das Geschäft mit der Angst am besten gelungen. Sie haben die Angst vor dem Klimawandel in Zustimmung ummünzen können. Diese Ängste haben [..] die Ängste vor Terror und Kriminalität übertroffen."
Quelle: rbb24.de/politik/wahl/E…
Das traurige ist, dass uns (fast?) alle Pareien Angst vor igendeinem Buhmann machen wollen - Atomkraft, Migranten, Superreichen oder Terror. Und sich dann wundern, warum der Wähler so pessimistisch ist.

Wie wäre es mal mit postiven Zukunftsvisionen? Hoffnung machen und so?
Read 4 tweets
Stefan Werner Profile picture
Apr 26, 2019
Not sure how many of my followers write volumetric path tracers, but to those who do, here's a very specific tip:

When implementing equiangular sampling for one-sided area lights, make sure to exclude samples that lie on the back side of the light. ImageImage
The literature I found (SIGGRAPH course notes, Kulla/Fajardo 2012 paper) don't go into exact details on how to do area lights optimally.

Source code and ugly drawing (it's mostly just a ray/plane intersection):
github.com/skwerner/blend… Image
(The images are after/before renders, solid angle sampled area light, homogenous infinite medium, equiangular sampling, 16spp #b3d Cycles)
Read 11 tweets

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