Topics

1

General / Selection of Model by elevation??

« on: August 29, 2024, 08:29:16 PM »

Hi all

Is there a method for breaking down models by elevation? I have a 3D model of a seashore and I'm interested in measuring the seaweed composition at different tidal heights (e.g.  above 1m and below 2.5 m elevation). Is there such a way of  processing the model, so I only see the model portion within those elevations? Something like a gradual selection tool for this purpose would be ideal!

Many thanks

Joe

2

General / Axes Orientation

« on: June 10, 2024, 07:01:40 PM »

Hi all

Looking for help orientating underwater models.

We are making large scale models of the seabed using ROVs with a stereo-pair of GoPros to capture video.

At the moment we are working on underwater cliffs and are really interested in how the slope/gradient of the cliffs affects the the life that lives on it. But to start we need to orientate our model correctly and this is where we are having problems. We know that the pitch of the ROV doesn't change during the survey (it's effectively level) and had hoped to use this to orientate our model, but so far we are not having any success. Does anybody have any advice on this?

Any advice on how to measure slope angle would also be welcome. At the moment we are using surface normals, but would be interested in if there is any easier way.

Many thanks

Joe