Here you can learn about the structure and applications of Pytorch3D from examples which are in the form of ipython notebooks.
At the top of each example you can find a button named "Run in Google Colab" which will open the notebook in Google Colaboratory where you can run the code directly in the browser with access to GPU support - it looks like this:
You can modify the code and experiment with varying different settings. Remember to install the latest stable version of PyTorch3D and its dependencies. Code to do this with pip is provided in each notebook.
There is also a button to download the notebook and source code to run it locally.