manycore-research/SpatialLM ? reverse-engineered prompt

Build me a Python project that can take a 3D point cloud of an indoor scene and turn it into a structured room description, like walls, doors, windows, and 3D boxes for objects with their names. I want to be able to run it on a single point cloud file, save the predicted layout to a text file, and then visualize both the original point cloud and the detected structures in a viewer. It should also support a mode where I can ask it to look only for certain object categories, like bed or nightstand.

Please include scripts or commands for inference, evaluation, training or fine tuning, and visualization, so it feels like a complete research repo. If you need to, look up the current docs online for any missing setup details. Make it easy to run on a new machine with clear install steps and sensible defaults.