Taichi NeRFs

A PyTorch + Taichi implementation of instant-ngp NeRF training pipeline. For more details about modeling, please checkout this article on our blog site.

Installation

1. Install PyTorch by python -m pip install torch torchvision --extra-index-url https://download.pytorch.org/whl/cu116 (update the url with your installed CUDA Toolkit version number).
2. Install taichi nightly via pip install -U pip && pip install -i https://pypi.taichi.graphics/simple/ taichi-nightly.
3. Install requirements by pip install -r requirements.txt.
4. If you plan to train with your own video, please install colmap via sudo apt install colmap or follow instructions at https://colmap.github.io/install.html.

Train with preprocessed datasets

Synthetic NeRF

Download Synthetic NeRF dataset and unzip it. Please keep the folder name unchanged.

We also provide a script to train the Lego scene from scratch, and display an interactive GUI at the end of the training.

./scripts/train_nsvf_lego.sh

Performance is measured on a Ubuntu 20.04 with an RTX3090 GPU.

Scene	avg PSNR	Training Time(20 epochs)	GPU
Lego	35.0	208s	RTX3090

To reach the best performance, here are the steps to follow:

1. Your work station is running on Linux and has RTX 3090 Graphics card
2. Follow the steps in Installation Section
3. Uncomment --half2_opt to enable half2 optimization in the script, then ./scripts/train_nsvf_lego.sh. For now, half2 optimization is only supported on Linux with Graphics Card Architecture >Pascal.

360_v2 dataset

Download 360 v2 dataset and unzip it. Please keep the folder name unchanged. The default batch_size=8192 takes up to 18GB RAM on a RTX3090. Please adjust batch_size according to your hardware spec.

./scripts/train_360_v2_garden.sh

Train with your own video

Place your video in data folder and pass the video path to the script. There are several key parameters for producing a sound dataset for NeRF training. For a real scene, scale is recommended to set to 16. video_fps determines the number of images generated from the video, typically 150~200 images are sufficient. For a one minute video, 2 is a suitable number. Running this script will preprocess your video and start training a NeRF out of it:

./scripts/train_from_video.sh -v {your_video_name} -s {scale} -f {video_fps}

Mobile Deployment

Taichi NGP Deployment

Using Taichi AOT, you can easily deploy a NeRF rendering pipeline on any mobile devices!

We're able to achieve real-time interactive on iOS devices.

Performance	iPad Pro (M1)	iPhone 14 Pro Max	iPhone 14
Taichi Instant NGP	22.4 fps	18 fps	13.5 fps

Stay tuned, more cool demos are on the way! For business inquiries, please reach out us at contact@taichi.graphics.

Text to 3D

Taichi-nerf serves as a new backend of the text-to-3D project stable-dreamfusion.

Frequently asked questions (FAQ)

Q: Is CUDA the only supported Taichi backend? How about vulkan backend?

A: For the most efficient interop with PyTorch CUDA backend, training is mostly tested with Taichi CUDA backend. However it's pretty straightforward to switch to Taichi vulkan backend if interop is removed, check out this awesome taichi-ngp inference demo!

Q: I got OOM(Out of Memory) error on my GPU, what can I do?

A: Reduce batch_size passed to train.py! By default it's 8192 which fits a RTX3090, you should reduce this accordingly. For instance, batch_size=2048 is recommended on a RTX3060Ti.

Acknowledgement

The PyTorch interface of the training pipeline and colmap preprocessing are highly referred to:

• ngp_pl
• instant-ngp CUDA implementation