Calculate volume with an arbitrary plane

[janstevens]

For research I dropped sand into a box an made a 3D point cloud with photogrammetry. Now i have to calculate the volume of the sand, but the problem is that the sand is covered on the whole surface of the box. So the bottom surface is not visible.

I understand that the volume can be calculated with the volume tool between a 2.5D cloud and an arbitrary plane (constant height). My question is now: how can you set that arbitrary plane? I have to set a parallel plane with a certain offset towards a certain known point. I have the numbers, but I don't know the method to set this up.

Kindly Regards

Jan

[daniel]

With this tool the arbitrary plane is actual an horizontal plane and you just have to set its altitude.

If you really want an arbitrary plane, you could create one (with the 'Primitive factory', or the 'Edit > Plane > Create' tool). And then sample points on this plane. And use the resulting cloud with 2.5D Volume calculation tool.

[janstevens]

With this tool the arbitrary plane is actual an horizontal plane and you just have to set its altitude.

If you really want an arbitrary plane, you could create one (with the 'Primitive factory', or the 'Edit > Plane > Create' tool). And then sample points on this plane. And use the resulting cloud with 2.5D Volume calculation tool.

Thansk for the answer. I made an arbitrary plane but I can't select it to use in the 2.5D volume calculation tool?

[daniel]

You have to sample points on it first (with the 'Edit > Mesh > Sample' points) as the 2.5D Volume calculation tool only takes clouds as input.