Why is in_features_dim = 5 for S3DIS?

[DarylWM]

Thank you for sharing this project; I'm finding the code to be clear and well commented, which makes it easier to understand.

One parameter I don't undestand though is why the input features dimension is 5 for the S3DIS dataset. Why would it not be 6, for (x,y,z,r,g,b)?

Daryl.