Mitsuba3 Time-of-Flight Renderer

About

This repository implemented several ToF rendering algorithms using Mitsuba3. This repository is extended version of our previous D-ToF renderer at here (SIGGRAPH Asia 2023).

Install

To compile, follow the original Mitsuba3's compliation guide at here. We also provide a video that installs Mitsuba3ToF which could be found at here.

Implementation (20240301 updated)

• Transient Rendering
• Transient Rendering for Participating Media
• Time-Gated Rendering
• Time-Gated Rendering for Participating Media
• Doppler-ToF Rendering

Usage

This example provides an simple transient rendering for cornell-box scene.

cd tof_tutorials/transient
python main.py

You can also try other rendering algorithms in each folder in tof_tutorials.

Parameter Description

Transient Renderering

For transient rendering, we use binning and build a histogram for the transient signal. Here, transient signal is equivalent to impulse response. We provide two integrators, transient for surface rendering, and voltransient for participating media (volumetric) rendering. Followings are used parameters for both of the integrators.

• tMin : Minimum path length.
• tMax : Maximum path length.
• tBin : Number of time bins.
• tRes : Path length resolution in histogram. If tBin is set, tBin is used with higher priority.

Surface transient rendering	Volumetric transient rendering

Time Gated Rendering

Instead of a series of images, time gated rendering only renders a single image at specific time stamp (or path length). We provide two integrators, timegated for surface rendering, and voltimegated(TODO) for participating media rendering. Followings are used parameters for both of the integrators.

• targetDist ($t0$) : Target path length.
• windowSize ($w$) : A parameter used for path length importance function.
• mode : Path length importance function. We provide following 5 modes. Each mode returns following value, where $v = (t - t0) / w$ and $t$ is path distance
  • box : $1(|v| < 0.5)$
  • tent: $\max(1 - |v|, 0)$
  • cos : $\cos(2 \pi|v|)$
  • sin : $\sin(2 \pi|v|)$
  • exponential: $u(-v)\exp(v)$

box with windowSize 1	exponential with windowSize 0.1

Citation

If you find this useful for your research, please consider to cite:

@article{kim2023doppler,
  title={Doppler Time-of-Flight Rendering},
  author={Kim, Juhyeon and Jarosz, Wojciech and Gkioulekas, Ioannis and Pediredla, Adithya},
  journal={ACM Transactions on Graphics (TOG)},
  volume={42},
  number={6},
  pages={1--18},
  year={2023},
  publisher={ACM New York, NY, USA}
}