Hi:
I would like to know if it’s possible to select points in a point cloud using the boundaries of a volume like a rectangular box?
I laser scan a lot of accident vehicles and use Rhino to manage the point clouds. If I scan the same vehicle twice, which I always do, often there’s one area that doesn’t get captured well in one of the models but looks good in the second model.
For instance, if the roof of a given vehicle was captured well in scan “A” but had voids in scan “B”, I would like to take the roof skin from B and transplanted to scan A, cutting out the poorly-captured roof skin from A, like a transplant.
I would like to align and overlap the two vehicles very carefully within Rhino so that they are essentially superimposed on one another, create a box volume around the points that I want to transplant in both models, and then use the point cloud - remove command to cut the roof points out of both models. Then I could delete the cloud of poorly scanned roof points from model B, keep the well-scanned roof points from model A, and delete the rest of model A, thereby blending the models into a single quality point cloud without duplicating points.
If I try to do this by manually selecting a boundary around the points I want to transplant, there’s always an imperfect overlap where there’s twice as many points as you need around the fringe of the transplant in some areas but there are voids between the edges of model A and model B in other areas.
My goal is to find a way to use a volume so that I can snap to the corners when I’m selecting the region that I want the points to be within, thereby cutting both models along the same clean line so that the transplanted section is the same size and shape in both models.
I’m thinking there’s a way to do this using a box made out of six cutting planes but, before I put together my own clumsy solution, I wanted to see if there was one that you would recommend instead?
I hope that messy question was clear enough.
Thanks for all your help.
Don
Hi Don - make your box or other closed shape.
Start PointCloud > Remove
Type SelVolumeObject and then select your box.
Any luck?
-Pascal
Pascal, that was nuts!
Exactly what I was looking for.
I would never have known that SelVolumeObject was an option without your lead.
Thanks, as always. Terrific Rhino support is why I dumped AutoDesk.