cloud offset to compute volume between surfaces

[poqy]

Hello,
I have one cloud, surface and i need to offset the surface 1m inside the stack, to create ground. Then I can compute volume between the two surfaces(groud,before-ceil,after) with 2.5D Volume . Pllease help how I can offset the cloud(mesh). (sorry for bad english)

[daniel]

Ah you want to offset the cloud along the local surface normal?

That's not possible with CloudCompare. But that's fairly easy with Excel or Matlab, if you export the cloud with its normals as an ASCII file. Then it's just a matter of adding to the point (X, Y, Z) the normal (Nx, Ny, Nz) multiplied by a quantity.

CloudCompare can help you computing the normals if the cloud doesn't have any yet (Edit > Normals > Compute).

The only watchout is to avoid to shift the points too much if there are complex geometries, as it might create topology artifacts...

[poqy]

Thank You, You helped Me a lot.

[DA523]

You may try Blender
Extrude faces along normal
ALT+E
..

222led.png (76.57 KiB) Viewed 1504 times

..

check this example (stl mesh)

12.png (74.61 KiB) Viewed 1502 times