Please meet @afectivo.bsky.social . This is a new firm my partner and I are starting in Madrid, Spain. For now we are doing consulting work (in audio and outside of audio), but we have other exciting technology projects and initiatives in the pipeline we hope to be announcing in the coming months.

Thanks!

Beautiful project! Do you have any recommendations for literature on relativistic ray tracing (and practical implementations)?

Depends on the community you're looking for. I'm happy with the number of 'graphics researchers and programmers' here on Bluesky. I don't feel like I'm really missing out on anything since leaving twitter.

I found this to be a great reference: github.com/rgl-epfl/cho...
The kernels are precompiled to PTX and shipped with the PyPI package. On the user machine, they are JIT compiled using the CUDA driver API (dynamically loaded). However, this doesn't link any library, so might not be what you need.

Paper: dl.acm.org/doi/pdf/10.1145/3730900
Code (based on Mitsuba 3): github.com/tjueterb/mis...

This is joint work between the computer graphics and audio communication groups at TU Berlin, with @ugoalone.bsky.social, @tjueterb.bsky.social, Daniel Wujecki, Fabian Brinkmann, Stefan Weinzierl, and Marc Alexa.

We extend Radiative Backpropagation (by @merlin.ninja)/Path Replay Backpropagation (by @deliovicini.bsky.social), to time-dependent energy transport, enabling backpropagation in linear-time with constant-memory. Despite simulating time-dependent functions, we only need one additional scalar per ray!

Our key observation is that this duality between acoustics and graphics lets us apply concepts from physically-based differentiable rendering to acoustics, enabling gradient-based optimization of acoustic objectives.

The simulations assume that energy travels along rays and even the rendering equation is the same as in graphics! Almost, at least. Time is an additional parameter, because sound cannot be assumed to travel instantaneously.

Room acoustics design, for example of concert halls, is currently a time-consuming process: engineers often semi-manually tweak a room's geometry and materials in long simulation loops to improve characteristics like clarity.

Feel free to reach out to me at the conference or via mail.

Special thanks to @wjakob.bsky.social for his valuable feedback and for giving us the historical context for the original papers.

Paper: diglib.eg.org/items/67d3e0...
Code: github.com/mworchel/mit... (hopefully soon in Mitsuba 3)

3/3

The reason lies deeper in the theory of radiative backpropagation (RB), the technique underlying these integrators: it was derived under the assumption of static geometry. We extend this theory to non-static geometry and show how the simplicity of RB can be retained in this case. 2/3