Synthesized Convolution Reverb by Raytracing (with Blender3D)

#1

The Programm I’ve implemented as a Prototype in Python is meant to generate a synthesized reverb in an artificial room modeled in Blender3D.
So it calculates a reverb cararacteristic for a given Signal (eg. an Impuls) and a given set of Data (eg. size of the room, topology, position of the signal source, position of the reciver … ).

Goals:

  • Multible Sources support
  • native stereo support
  • Make it animatable
  • Implement diffrerent Materials (eg. paraterized EQ or diffuse Scattering)
  • Implement it in C++ & OpenCL for faster raytracing

DevelopementSite with first applicable .blend including python source (but be careful it could be slow):
https://developer.blender.org/T43549

#2

First proof of concept results :
https://soundcloud.com/sebastian-schwank/sets/project-soundray

And of course first Sceenshots:

Bas5cScene.png1920×1200 198 KB


-aths.png1920×1200 172 KB

#3

Hey,

very nice little project you have here.
I played around a little and tried creating an empty room (which leads to less occlusions) and lowered the scale factor from 8 to 2 (otherwise Python ran out of space with “List Index out of range, on line 97”).

This is the room with the sound waves:

SoundRayAlpha1_Empty_Scale2.blend.jpg1904×1002 449 KB

And this is the audio output. The upper waveform is with a high scale value and the bottom waveform is the scene from above with a scale of 2.

SoundRayAlpha1_Empty_Scale2.audio.jpg1252×692 162 KB

If I find time I will do some more testing.
Fascinating to see the power of Python with creating audio files from a physical calculation of the Blender scene. If it just would be more performant…

Keep it up!

#4

OMG! I love the idea of visualising a recording space and a sound space for playback. Could you specify surface materials as well?

A strange example from work, I often have clients send voice over recordings made in a motor vehicle, as they think that it is quiet and small. But it’s full of reflective surfaces and sounds overly bright. Wish I could show people how bad the idea is. Then what environment would be better (generally).

Love this!

#5

Currently only fully reflective surfaces are supported.
(Will add blocking soon)

Some Updated IR-Results are avalilable here:

https://soundcloud.com/sebastian-schwank/sets/free-irs-created-in-blender3d

#6

Found a much easier way to calculate the reverb using cycles.
Results soon.

#7

I guess there’s no way to try this solution in current version of Blender? At least I see no attached scripts in https://developer.blender.org/T43549.