This is a very simple visualizer based on PCL. It can visualize PLY files with transparency / opacity (alpha value). It is used to visualize the radiance field as point clouds in Switch-NeRF.

You should first install PCL. Please refer to its official website.

Then run following commands:

mkdir build
cd build
cmake ..
make

If you get cmake warnings about VTK or Qt5, you can specify the Qt5 path in the cmake, for example:

cmake -DQt5_DIR=/path/to/your/qt5/lib/cmake/Qt5 ..

Given several point clouds file1.ply, file2.ply, run following commands to visualize them together:

./build/alpha_visualizer/alpha_visualizer file1.ply file2.ply