Hi Alexey,
Thanks for the quick response. I've now got what looks like camera-local coords for each tie-point seen in each camera (e.g. chunk.point_cloud.projections[chunk.cameras[0]][0].coord, so what I need to do is link this one specific point to one of the points in the sparse point cloud, i.e. a specific index in chunk.point_cloud.points. Is there a way to do this?
What I'm trying to do is link each point in the sparse point cloud to the cameras used to locate it, so that I can generate a lookup where I can select some points and see the relevant cameras, or select some cameras and see the points they generated.
Thanks again for your help