Apply the transformation to eigen vectors

[aguenette]

This PR adds the eigen vectors to the descriptors that need to be transformed in the RigidTransformation and SimilarityTransformation methods, because it was not the case when they were present in the descriptors. This was causing issues when trying to visualize them and working with them.

[YoshuaNava]

@aguenette The PR looks good to me. Nonetheless, I wanted to ask if it would be possible to create in a follow-up a centralized definition of commonly used point cloud fields. For example, normals, eigVectors, densities, etc? Such that any user of these fields can fetch the definitions from there.

[aguenette]

@aguenette The PR looks good to me. Nonetheless, I wanted to ask if it would be possible to create in a follow-up a centralized definition of commonly used point cloud fields. For example, normals, eigVectors, densities, etc? Such that any user of these fields can fetch the definitions from there.

Hi @YoshuaNava! Thanks for your review. About the centralized definition of the point cloud fields, the DataPointsFilters page already provide a short definition of the different fields present in the filters, but some filters miss some fields. So, it could be a good start to add the missing ones and improve their definitions or maybe we could add a section at the end of the DataPointsFilters page who would provide a more detailed definition of them. What do you think? Were you talking about something like this?